Ariane 5: Difference between revisions

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imported>Kuomalainen
Changed a section of the lead to be more clear about what was happening "Since 2014".
imported>Hal Nordmann
m Launch preparations: Changed to past tense and fixed a typo
 
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| name          = Ariane 5
| name          = Ariane 5
| image          = Ariane 5 with James Webb Space Telescope Prelaunch (51773093465).jpg
| image          = Ariane 5 with James Webb Space Telescope Prelaunch (51773093465).jpg
| caption        = Ariane 5 flight [[Ariane flight VA256|VA-256]] on the launch pad with the [[James Webb Space Telescope]] in December 2021
| caption        = Ariane 5 flight [[Ariane flight VA256|VA-256]] on the launch pad with the [[James Webb Space Telescope]] on December 2021


| function      = [[Heavy-lift launch vehicle]]
| function      = [[Heavy-lift launch vehicle]]
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}}
}}
   }}
   }}
| family       = [[Ariane (rocket family)|Ariane]]
| family         = [[Ariane (rocket family)|Ariane]]
| derived_from  = [[Ariane 4]]
| derivatives    = [[Ariane 6]]
| comparable    = {{flatlist|
| comparable    = {{flatlist|
* [[Atlas V]]
* [[Atlas V]]
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* [[H-IIB]]
* [[H-IIB]]
* [[Long March 5]]
* [[Long March 5]]
* [[LVM3]]
* [[Proton-M]]
* [[Proton-M]]
* [[GSLV Mark III]]
}}
}}
|status          = Retired
|status          = Retired
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Since its first launch, Ariane 5 was refined in successive versions: "G", "G+", "GS", "ECA", and finally, "ES". The system had a commonly used dual-launch capability, where up to two large geostationary belt [[communication satellite]]s can be mounted using a '''SYLDA''' (''Système de Lancement Double Ariane'', meaning "Ariane Double-Launch System") carrier system. Up to three, somewhat smaller, main satellites are possible depending on size using a '''SPELTRA''' (''Structure Porteuse Externe Lancement Triple Ariane'', which translates to "Ariane Triple-Launch External Carrier Structure"). Up to eight secondary payloads, usually small experiment packages or [[miniaturized satellite|minisatellites]], could be carried with an '''ASAP''' (Ariane Structure for Auxiliary Payloads) platform.
Since its first launch, Ariane 5 was refined in successive versions: "G", "G+", "GS", "ECA", and finally, "ES". The system had a commonly used dual-launch capability, where up to two large geostationary belt [[communication satellite]]s can be mounted using a '''SYLDA''' (''Système de Lancement Double Ariane'', meaning "Ariane Double-Launch System") carrier system. Up to three, somewhat smaller, main satellites are possible depending on size using a '''SPELTRA''' (''Structure Porteuse Externe Lancement Triple Ariane'', which translates to "Ariane Triple-Launch External Carrier Structure"). Up to eight secondary payloads, usually small experiment packages or [[miniaturized satellite|minisatellites]], could be carried with an '''ASAP''' (Ariane Structure for Auxiliary Payloads) platform.


Following the launch of 15 August 2020, Arianespace signed the contracts for the last eight Ariane 5 launches, before it was succeeded by the new [[Ariane 6]] launcher, according to Daniel Neuenschwander, director of space transportation at the ESA.<ref name="Ariane6">{{cite web|url=https://spaceflightnow.com/2020/08/15/debuting-upgrades-ariane-5-rocket-deploys-three-u-s-built-satellites-in-orbit/|title=Debuting upgrades, Ariane 5 rocket deploys three U.S.-built satellites in orbit|publisher=Spaceflight Now|date=15 August 2020|access-date=17 August 2020}}</ref><ref name=mtg-s/> Ariane 5 flew its final mission on 5 July 2023.<ref>{{Cite web |last=Svenson |first=Adam |date=2023-07-06 |title=Last Ariane 5 Mission Leaves Europe Without Launch Capacity |url=https://airspacenews.net/last-ariane-5-mission-leaves-europe-without-launch-capacity/ |access-date=2023-07-23 |website=AIR SPACE News |language=en-US}}</ref>
Following the launch of 15 August 2020, Arianespace signed the contracts for the last eight Ariane 5 launches, before it was succeeded by the new [[Ariane 6]] launcher, according to Daniel Neuenschwander, director of space transportation at the ESA.<ref name="Ariane6">{{cite web|url=https://spaceflightnow.com/2020/08/15/debuting-upgrades-ariane-5-rocket-deploys-three-u-s-built-satellites-in-orbit/|title=Debuting upgrades, Ariane 5 rocket deploys three U.S.-built satellites in orbit|publisher=Spaceflight Now|date=15 August 2020|access-date=17 August 2020}}</ref><ref name=mtg-s/> Ariane 5 flew its final mission on 5 July 2023.<ref>{{Cite web |last=Svenson |first=Adam |date=2023-07-06 |title=Last Ariane 5 Mission Leaves Europe Without Launch Capacity |url=https://airspacenews.net/last-ariane-5-mission-leaves-europe-without-launch-capacity/ |access-date=2023-07-23 |website=AIR SPACE News}}</ref>


== Vehicle description ==
== Vehicle description ==
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=== Solid boosters ===
=== Solid boosters ===
Attached to the sides were two P241 (P238 for Ariane 5G and G+) [[solid rocket booster]]s (SRBs or EAPs from the French ''Étages d'Accélération à Poudre''), each weighing about {{cvt|277|t|lb}} full and delivering a thrust of about {{cvt|7080|kN}}. They were fueled by a mix of [[ammonium perchlorate]] (68%) and aluminium fuel (18%) and [[hydroxyl-terminated polybutadiene|HTPB]] (14%). They each burned for 130 seconds before being dropped into the ocean. The SRBs were usually allowed to sink to the bottom of the ocean, but, like the [[Space Shuttle Solid Rocket Booster]]s, they could be recovered with parachutes, and this was occasionally done for post-flight analysis. Unlike Space Shuttle SRBs, Ariane 5 boosters were not reused. The most recent attempt was for the first Ariane 5 ECA mission in 2009. One of the two boosters was successfully recovered and returned to the Guiana Space Center for analysis.<ref name="FranceScience">{{cite web|url=http://www.france-science.org/spip.php?article399#3-ARIANE-5-ECA-BOOSTER-RECOVERED|title=France in Space #387|publisher=Office of Science and Technology Embassy of France in the USA|url-status=dead|archive-url=https://web.archive.org/web/20090125213207/http://www.france-science.org/spip.php?article399#3-ARIANE-5-ECA-BOOSTER-RECOVERED|archive-date=25 January 2009}}</ref> Prior to that mission, the last such recovery and testing was done in 2003.{{Citation needed|date=January 2022}}
Attached to the sides were two P241 (P238 for Ariane 5G and G+) [[solid rocket booster]]s (SRBs or EAPs from the French ''Étages d'Accélération à Poudre'' — {{Literal translation|Powder Acceleration Stages}}), each weighing about {{cvt|277|t|lb}} full and delivering a thrust of about {{cvt|7080|kN}}. They were fueled by a mix of [[ammonium perchlorate]] (68%) and aluminium fuel (18%) and [[hydroxyl-terminated polybutadiene|HTPB]] (14%). They each burned for 130 seconds before being dropped into the ocean. The SRBs were usually allowed to sink to the bottom of the ocean, but, like the [[Space Shuttle Solid Rocket Booster]]s, they could be recovered with parachutes, and this was occasionally done for post-flight analysis. Unlike Space Shuttle SRBs, Ariane 5 boosters were not reused. The most recent attempt was for the first Ariane 5 ECA mission in 2009. One of the two boosters was successfully recovered and returned to the Guiana Space Center for analysis.<ref name="FranceScience">{{cite web|url=http://www.france-science.org/spip.php?article399#3-ARIANE-5-ECA-BOOSTER-RECOVERED|title=France in Space #387|publisher=Office of Science and Technology Embassy of France in the USA|url-status=dead|archive-url=https://web.archive.org/web/20090125213207/http://www.france-science.org/spip.php?article399#3-ARIANE-5-ECA-BOOSTER-RECOVERED|archive-date=25 January 2009}}</ref> Prior to that mission, the last such recovery and testing was done in 2003.{{Citation needed|date=January 2022}}


The French [[M51 (missile)|M51]] [[Submarine-launched ballistic missile|submarine-launched ballistic missile (SLBM)]] shared a substantial amount of technology with these boosters.<ref>{{cite news|title=French Navy SSBN 'Le Téméraire' Test Fired M51 SLBM In Operational Conditions|author=Xavier Vavasseur |date=12 Jun 2020|url=https://www.navalnews.com/naval-news/2020/06/french-navy-ssbn-le-temeraire-test-fired-m51-slbm-in-operational-conditions/|website=navalnews.com|access-date=March 27, 2023}}</ref>
The French [[M51 (missile)|M51]] [[Submarine-launched ballistic missile|submarine-launched ballistic missile (SLBM)]] shared a substantial amount of technology with these boosters.<ref>{{cite news |author=Vavasseur |first=Xavier |date=12 June 2020 |title=French Navy SSBN 'Le Téméraire' Test Fired M51 SLBM In Operational Conditions |url=https://www.navalnews.com/naval-news/2020/06/french-navy-ssbn-le-temeraire-test-fired-m51-slbm-in-operational-conditions/ |access-date=March 27, 2023 |website=navalnews.com}}</ref>


In February 2000, the suspected [[nose cone]] of an Ariane 5 booster washed ashore on the [[South Texas]] coast, and was recovered by [[Beachcombing|beachcombers]] before the government could get to it.<ref>{{cite web |url=http://www.foxnews.com/etcetera/022900/space.sml |archive-url=https://web.archive.org/web/20010224100038/http://www.foxnews.com/etcetera/022900/space.sml |date=29 February 2000 |agency=Associated Press |publisher=Fox News |title=Government Loses Unidentified Floating Object |archive-date=24 February 2001 }}</ref>
In February 2000, the suspected [[nose cone]] of an Ariane 5 booster washed ashore on the [[South Texas]] coast, and was recovered by [[Beachcombing|beachcombers]] before the government could get to it.<ref>{{cite web |date=29 February 2000 |title=Government Loses Unidentified Floating Object |url=http://www.foxnews.com/etcetera/022900/space.sml |url-status=dead |archive-url=https://web.archive.org/web/20010224100038/http://www.foxnews.com/etcetera/022900/space.sml |archive-date=24 February 2001 |website=Fox News |agency=Associated Press}}</ref>


=== Second stage ===
=== Second stage ===
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The EPS upper stage was capable of repeated ignition, first demonstrated during flight V26 which was launched on 5 October 2007. This was purely to test the engine, and occurred after the payloads had been deployed. The first operational use of restart capability as part of a mission came on 9 March 2008, when two burns were made to deploy the first [[Automated Transfer Vehicle]] (ATV) into a circular parking orbit, followed by a third burn after ATV deployment to de-orbit the stage. This procedure was repeated for all subsequent ATV flights.
The EPS upper stage was capable of repeated ignition, first demonstrated during flight V26 which was launched on 5 October 2007. This was purely to test the engine, and occurred after the payloads had been deployed. The first operational use of restart capability as part of a mission came on 9 March 2008, when two burns were made to deploy the first [[Automated Transfer Vehicle]] (ATV) into a circular parking orbit, followed by a third burn after ATV deployment to de-orbit the stage. This procedure was repeated for all subsequent ATV flights.


Ariane 5ECA used the ESC (''Étage Supérieur Cryotechnique'' — Cryogenic Upper Stage), which was fueled by liquid hydrogen and liquid oxygen. The ESC used the [[HM7B]] engine previously used in the Ariane 4 third stage. The propellent load of 14.7 tonne allowed the engine to burn for 945 seconds while providing 6.5 tonne of thrust. The ESC provided roll control during powered flight and full attitude control during payload separation using hydrogen gas thrusters. Oxygen gas thrusters allowed longitudinal acceleration after engine cutoff. The flight assembly included the Vehicle Equipment Bay, with flight electronics for the entire rocket, and the payload interface and structural support.<ref>European Space Agency, "Ariane 5ECA": http://www.esa.int/Enabling_Support/Space_Transportation/Launch_vehicles/Ariane_5_ECA2 Discussed in context of other launch vehicles in Gérard Maral, Michel Bousquet, and Zhili Sun, ''Satellite Communications Systems: Systems, Techniques and Technology'', sixth edition, London: Wiley, 2020 {{ISBN|9781119382072}}</ref><ref>[https://www.arianespace.com/?popup=ariane-5-4 ESC-A – Cryogenic upper stage], accessed December 27, 2021</ref>
Ariane 5ECA used the ESC (''Étage Supérieur Cryotechnique'' — Cryogenic Upper Stage), which was fueled by liquid hydrogen and liquid oxygen. The ESC used the [[HM7B]] engine previously used in the Ariane 4 third stage. The propellent load of 14.7 tonne allowed the engine to burn for 945 seconds while providing 6.5 tonne of thrust. The ESC provided roll control during powered flight and full attitude control during payload separation using hydrogen gas thrusters. Oxygen gas thrusters allowed longitudinal acceleration after engine cutoff. The flight assembly included the Vehicle Equipment Bay, with flight electronics for the entire rocket, and the payload interface and structural support.<ref>European Space Agency, "Ariane 5ECA": http://www.esa.int/Enabling_Support/Space_Transportation/Launch_vehicles/Ariane_5_ECA2 Discussed in context of other launch vehicles in Gérard Maral, Michel Bousquet, and Zhili Sun, ''Satellite Communications Systems: Systems, Techniques and Technology'', sixth edition, London: Wiley, 2020 {{ISBN|9781119382072}}</ref><ref>{{Cite web |title=ESC-A – Cryogenic upper stage |url=https://www.arianespace.com/?popup=ariane-5-4 |url-status=dead |archive-url=https://web.archive.org/web/20211227172650/https://www.arianespace.com/?popup=ariane-5-4 |archive-date=December 27, 2021 |access-date=December 27, 2021 |website=Arianespace}}</ref>


=== Fairing ===
=== Fairing ===
The payload and all upper stages were covered at launch by a fairing for aerodynamic stability and protection from heating during supersonic flight and acoustic loads. It was jettisoned once sufficient altitude has been reached, typically above {{cvt|100|km}}. It was made by [[RUAG Space|Ruag Space]] and since flight VA-238 it was composed of 4 panels.<ref>{{cite web|author1=ESA|title=Ariane 5 launch proves reliability and flies new fairing|url=https://www.esa.int/Enabling_Support/Space_Transportation/Ariane_5_launch_proves_reliability_and_flies_new_fairing|access-date=27 February 2020}}</ref>{{clarify|that's fine for explaining what fairings do, generally. But who makes the Ariane fairing? At what cost? What are any of it's design specifications or design characteristics?|date=September 2019}}
The payload and all upper stages were covered at launch by a fairing for aerodynamic stability and protection from heating during supersonic flight and acoustic loads. It was jettisoned once sufficient altitude has been reached, typically above {{Convert|100|km|mi nmi|abbr=on}}. It was made by [[RUAG Space|Ruag Space]] and since flight VA-238 it was composed of 4 panels.<ref>{{cite web|author1=ESA|title=Ariane 5 launch proves reliability and flies new fairing|url=https://www.esa.int/Enabling_Support/Space_Transportation/Ariane_5_launch_proves_reliability_and_flies_new_fairing|access-date=27 February 2020}}</ref>{{clarify|that's fine for explaining what fairings do, generally. But who makes the Ariane fairing? At what cost? What are any of it's design specifications or design characteristics?|date=September 2019}}
 
=== Launch preparations ===
With the exception of the solid rocket boosters (for safety and cost reasons), the components were assembled in Europe, and then shipped to French Guyana by boat. Once at Kourou, the components were assembled in the Launcher Integration Building (BIL), then transfered into the Final Assembly Building (BAF) for mating the payload and fairing, before the completed rocket was transfered to the Launch Zone (ZL) for fueling and launch. <ref>{{cite web |url=https://arc.aiaa.org/doi/pdf/10.2514/6.2014-1624 |title=Ariane 5 production and integration operations: ten years of continuous efficiency and quality improvement |date=May 2014 |access-date=November 18, 2025}}</ref>


== Variants ==
== Variants ==
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|-
|-
| align="center" | '''ECA'''
| align="center" | '''ECA'''
| The Ariane 5ECA (''Evolution Cryotechnique type A''), first successfully flown in 2005, used an improved Vulcain 2 first-stage engine with a longer, more efficient nozzle with a more efficient flow cycle and denser propellant ratio. The new ratio required length modifications to the first-stage tanks. The EPS second stage was replaced by the ESC-A (''Etage Supérieur Cryogénique''-A), which had a dry weight of {{cvt|4540|kg}} and was powered by an [[HM-7B]] engine burning {{cvt|14900|kg}} of cryogenic [[Rocket propellant|propellant]]. The ESC-A used the liquid oxygen tank and lower structure from the Ariane 4's H10 third stage, mated to a new liquid hydrogen tank. Additionally, the EAP booster casings were lightened with new welds and carry more propellant. The Ariane 5ECA started with a GTO launch capacity of {{cvt|9100|kg}} for dual payloads or {{cvt|9600|kg}} for a single payload.<ref>{{cite web|url=https://space.skyrocket.de/doc_lau_det/ariane-5eca.htm|title=Ariane-5ECA|publisher=Gunter's Space Page|date=20 February 2020|access-date=23 October 2021}}</ref> Later batches: PB+ and PC, increased the max payload to GTO to {{cvt|11115|kg}}.<ref name=final-10/>
| The Ariane 5ECA (''Evolution Cryotechnique type A''), first flown in 2002 but ending in failure, and first successfully flown in 2005, used an improved Vulcain 2 first-stage engine with a longer, more efficient nozzle with a more efficient flow cycle and denser propellant ratio. The new ratio required length modifications to the first-stage tanks. The EPS second stage was replaced by the ESC-A (''Etage Supérieur Cryogénique''-A), which had a dry weight of {{cvt|4540|kg}} and was powered by an [[HM-7B]] engine burning {{cvt|14900|kg}} of cryogenic [[Rocket propellant|propellant]]. The ESC-A used the liquid oxygen tank and lower structure from the Ariane 4's H10 third stage, mated to a new liquid hydrogen tank. Additionally, the EAP booster casings were lightened with new welds and carry more propellant. The Ariane 5ECA started with a GTO launch capacity of {{cvt|9100|kg}} for dual payloads or {{cvt|9600|kg}} for a single payload.<ref>{{cite web|url=https://space.skyrocket.de/doc_lau_det/ariane-5eca.htm|title=Ariane-5ECA|publisher=Gunter's Space Page|date=20 February 2020|access-date=23 October 2021}}</ref> Later batches: PB+ and PC, increased the max payload to GTO to {{cvt|11115|kg}}.<ref name=final-10/> The Ariane 5 ECA flew 72 times from 2002 to 2019 with one failure and one partial failure.
|-
|-
| align="center" | '''ECA+'''
| align="center" | '''ECA+'''
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== Launch pricing and market competition ==
== Launch pricing and market competition ==
{{asof|2014|11}}, the Ariane 5 commercial launch [[Price#Confusion between prices and costs of production|price]] for launching a "midsize satellite in the lower position" was approximately €50 million,<ref name=aw20140310>{{cite news|last=Svitak|first=Amy|title=SpaceX Says Falcon 9 To Compete For EELV This Year|url=http://www.aviationweek.com/Article.aspx?id=/article-xml/AW_03_10_2014_p48-668592.xml|access-date=4 January 2015|publisher=Aviation Week|date=1 March 2014|quote=''Advertised at US$56.5 million per launch, Falcon 9 missions to GTO cost almost US$15 million less than a ride atop a Chinese Long March 3B and are competitive with the cost to launch a midsize satellite in the lower position on a European Ariane 5ECA''|archive-url=https://web.archive.org/web/20140310123118/http://www.aviationweek.com/Article.aspx?id=%2Farticle-xml%2FAW_03_10_2014_p48-668592.xml|archive-date=10 March 2014|url-status=live}}</ref> competing for commercial launches in an increasingly [[Space launch market competition|competitive market]].
{{asof|2014|11}}, the Ariane 5 commercial launch [[Price#Confusion between prices and costs of production|price]] for launching a "midsize satellite in the lower position" was approximately €50 million,<ref name="aw20140310">{{cite news |last=Svitak |first=Amy |date=1 March 2014 |title=SpaceX Says Falcon 9 To Compete For EELV This Year |url=https://aviationweek.com/space/spacex-says-falcon-9-compete-eelv-year |url-status=live |archive-url=https://web.archive.org/web/20250115025231/https://aviationweek.com/space/spacex-says-falcon-9-compete-eelv-year |archive-date=15 January 2025 |access-date=4 January 2015 |publisher=Aviation Week |quote=Advertised at US$56.5 million per launch, Falcon 9 missions to GTO cost almost US$15 million less than a ride atop a Chinese Long March 3B and are competitive with the cost to launch a midsize satellite in the lower position on a European Ariane 5ECA}}</ref> competing for commercial launches in an increasingly [[Space launch market competition|competitive market]].


The heavier satellite was launched in the upper position on a typical dual-satellite Ariane 5 launch and was priced higher than the lower satellite,<ref name=sn20131125>{{cite news|last=de Selding|first=Peter B. |title=SpaceX Challenge Has Arianespace Rethinking Pricing Policies|url=http://www.spacenews.com/article/launch-report/38331spacex-challenge-has-arianespace-rethinking-pricing-policies|archive-url=https://archive.today/20131127055319/http://www.spacenews.com/article/launch-report/38331spacex-challenge-has-arianespace-rethinking-pricing-policies|url-status=dead|archive-date=27 November 2013|access-date=27 November 2013|publisher=SpaceNews|date=2 November 2013|quote=''The Arianespace commercial launch consortium is telling its customers it is open to reducing the cost of flights for lighter satellites on the Ariane 5 rocket in response to the challenge posed by SpaceX's Falcon 9 rocket''}}</ref>{{clarify|date=January 2015}}<!-- still need to find a source for the specifics on this; for now, just qualitatively "higher" --> on the order of €90 million {{asof|2013|lc=y}}.<ref name="bbc20131203">{{cite news|url=https://www.bbc.co.uk/news/science-environment-25210742|title=SpaceX launches SES commercial TV satellite for Asia|last=Amos|first=Jonathan|date=3 December 2013|publisher=BBC News|access-date=4 January 2015|quote=''The commercial market for launching telecoms spacecraft is tightly contested, but has become dominated by just a few companies – notably, Europe's Arianespace, which flies the Ariane 5, and International Launch Services (ILS), which markets Russia's Proton vehicle. SpaceX is promising to substantially undercut the existing players on price, and SES, the world's second-largest telecoms satellite operator, believes the incumbents had better take note of the California company's capability. 'The entry of SpaceX into the commercial market is a game-changer''.|archive-url=https://web.archive.org/web/20170102045752/http://www.bbc.co.uk/news/science-environment-25210742|archive-date=2 January 2017|url-status=live}}</ref><ref name=sn20150105/>
The heavier satellite was launched in the upper position on a typical dual-satellite Ariane 5 launch and was priced higher than the lower satellite,<ref name="sn20131125">{{cite news |last=de Selding |first=Peter B. |date=2 November 2013 |title=SpaceX Challenge Has Arianespace Rethinking Pricing Policies |url=https://spacenews.com/38331spacex-challenge-has-arianespace-rethinking-pricing-policies/ |url-status= |archive-url= |archive-date= |access-date=27 November 2013 |publisher=SpaceNews |quote=The Arianespace commercial launch consortium is telling its customers it is open to reducing the cost of flights for lighter satellites on the Ariane 5 rocket in response to the challenge posed by SpaceX's Falcon 9 rocket...}}</ref>{{clarify|date=January 2015}}<!-- still need to find a source for the specifics on this; for now, just qualitatively "higher" --> on the order of €90 million {{asof|2013|lc=y}}.<ref name="bbc20131203">{{cite news |last=Amos |first=Jonathan |date=3 December 2013 |title=SpaceX launches SES commercial TV satellite for Asia |url=https://www.bbc.co.uk/news/science-environment-25210742 |url-status=live |archive-url=https://web.archive.org/web/20170102045752/http://www.bbc.co.uk/news/science-environment-25210742 |archive-date=2 January 2017 |access-date=4 January 2015 |work=BBC News |quote=The commercial market for launching telecoms spacecraft is tightly contested, but has become dominated by just a few companies – notably, Europe's Arianespace, which flies the Ariane 5, and International Launch Services (ILS), which markets Russia's Proton vehicle. SpaceX is promising to substantially undercut the existing players on price, and SES, the world's second-largest telecoms satellite operator, believes the incumbents had better take note of the California company's capability. "The entry of SpaceX into the commercial market is a game-changer...}}</ref><ref name=sn20150105/>


Total launch price of an Ariane 5 – which could transport up to two satellites to space, one in the "upper" and one in the "lower" positions – was around €150 million {{as of|2015|1|lc=on}}.<ref name=sn20150105>{{cite web|url=http://spacenews.com/with-eye-on-spacex-cnes-begins-work-on-reusable-rocket-stage/|title=With Eye on SpaceX, CNES Begins Work on Reusable Rocket Stage|publisher=SpaceNews|date=5 January 2015|access-date=6 January 2015}}</ref>
Total launch price of an Ariane 5 – which could transport up to two satellites to space, one in the "upper" and one in the "lower" positions – was around €150 million {{as of|2015|1|lc=on}}.<ref name=sn20150105>{{cite web|url=http://spacenews.com/with-eye-on-spacex-cnes-begins-work-on-reusable-rocket-stage/|title=With Eye on SpaceX, CNES Begins Work on Reusable Rocket Stage|publisher=SpaceNews|date=5 January 2015|access-date=6 January 2015}}</ref>
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Work on the Ariane 5 EAP motors was continued in the [[Vega (launcher)|Vega]] programme. The Vega 1st stage engine – the [[P80 (stage)|P80]] engine – was a shorter derivation of the EAP.<ref name="ESPPhandbook">{{cite book|title=European Space Policy and Programs Handbook|first1=Usa Ibp|last1=Usa|publisher=Int'l Business Publications|year=2010|isbn=9781433015328|page=29}}</ref> The P80 booster casing was made of filament wound graphite epoxy, much lighter than the current stainless steel casing. A new composite steerable nozzle was developed while new thermal insulation material and a narrower throat improved the expansion ratio and subsequently the overall performance. Additionally, the nozzle had electromechanical actuators which replaced the heavier hydraulic ones used for thrust vector control.
Work on the Ariane 5 EAP motors was continued in the [[Vega (launcher)|Vega]] programme. The Vega 1st stage engine – the [[P80 (stage)|P80]] engine – was a shorter derivation of the EAP.<ref name="ESPPhandbook">{{cite book|title=European Space Policy and Programs Handbook|first1=Usa Ibp|last1=Usa|publisher=Int'l Business Publications|year=2010|isbn=9781433015328|page=29}}</ref> The P80 booster casing was made of filament wound graphite epoxy, much lighter than the current stainless steel casing. A new composite steerable nozzle was developed while new thermal insulation material and a narrower throat improved the expansion ratio and subsequently the overall performance. Additionally, the nozzle had electromechanical actuators which replaced the heavier hydraulic ones used for thrust vector control.


These developments could maybe have made their way back into the Ariane programme, but this was most likely an inference based on early blueprints of the Ariane 6 having a central P80 booster and 2-4 around the main one.<ref name=sfn-20121121>{{cite news|url=http://spaceflightnow.com/news/n1211/21ariane/ |title=European ministers decide to stick with Ariane 5, for now|author=Stephen Clark|publisher=Spaceflight Now|date=21 November 2012|access-date=22 November 2012|archive-url=https://web.archive.org/web/20121127202631/http://spaceflightnow.com/news/n1211/21ariane/|archive-date=27 November 2012|url-status=live}}</ref><ref>{{cite web |url=http://www.esa.int/esaCP/SEMTHGD4VUE_Expanding_0.html|title=Successful firing of Vega's first-stage motor in Kourou|date=30 November 2006|publisher=ESA|access-date=30 December 2007|archive-url=https://web.archive.org/web/20120305173010/http://www.esa.int/esaCP/SEMTHGD4VUE_Expanding_0.html|archive-date=5 March 2012|url-status=live}}</ref> The incorporation of the ESC-B with the improvements to the solid motor casing and an uprated Vulcain engine would have delivered {{cvt|27000|kg}} to LEO. This would have been developed for any lunar missions but the performance of such a design might not have been possible if the higher [[Max Q|Max-Q]] for the launch of this launch vehicle would have posed a constraint on the mass delivered to orbit.<ref name="ariane upgrades">{{cite web|url=http://www.astron.nl/p/news/LO/Iranzo_Ariane5_LOFARworkshop.ppt |title=Ariane 5—A European Launcher for Space Exploration |access-date=10 April 2008 |author=David Iranzo-Greus |date=23 March 2005 |publisher=EADS SPACE Transportation |archive-url=https://web.archive.org/web/20080911061500/http://www.astron.nl/p/news/LO/Iranzo_Ariane5_LOFARworkshop.ppt |archive-date=11 September 2008}}</ref>
These developments could maybe have made their way back into the Ariane programme, but this was most likely an inference based on early blueprints of the Ariane 6 having a central P80 booster and 2-4 around the main one.<ref name="sfn-20121121">{{cite news |author=Clark |first=Stephen |date=21 November 2012 |title=European ministers decide to stick with Ariane 5, for now |url=http://spaceflightnow.com/news/n1211/21ariane/ |url-status=live |archive-url=https://web.archive.org/web/20121127202631/http://spaceflightnow.com/news/n1211/21ariane/ |archive-date=27 November 2012 |access-date=22 November 2012 |publisher=Spaceflight Now}}</ref><ref>{{cite web |url=http://www.esa.int/esaCP/SEMTHGD4VUE_Expanding_0.html|title=Successful firing of Vega's first-stage motor in Kourou|date=30 November 2006|publisher=ESA|access-date=30 December 2007|archive-url=https://web.archive.org/web/20120305173010/http://www.esa.int/esaCP/SEMTHGD4VUE_Expanding_0.html|archive-date=5 March 2012|url-status=live}}</ref> The incorporation of the ESC-B with the improvements to the solid motor casing and an uprated Vulcain engine would have delivered {{cvt|27000|kg}} to LEO. This would have been developed for any lunar missions but the performance of such a design might not have been possible if the higher [[Max Q|Max-Q]] for the launch of this launch vehicle would have posed a constraint on the mass delivered to orbit.<ref name="ariane upgrades">{{cite web |author=Iranzo-Greus |first=David |date=23 March 2005 |title=Ariane 5—A European Launcher for Space Exploration |url=http://www.astron.nl/p/news/LO/Iranzo_Ariane5_LOFARworkshop.ppt |archive-url=https://web.archive.org/web/20080911061500/http://www.astron.nl/p/news/LO/Iranzo_Ariane5_LOFARworkshop.ppt |archive-date=11 September 2008 |access-date=10 April 2008 |publisher=EADS SPACE Transportation}}</ref>


== Ariane 6 ==
== Ariane 6 ==
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The design brief of the next generation launch vehicle [[Ariane 6]] called for a lower-cost and smaller launch vehicle capable of launching a single satellite of up to {{cvt|6500|kg}} to GTO.<ref name=sfn201403327>{{cite web|last=Clark|first=Stephen|title=Germany calls for redesign of next-generation Ariane|date=27 March 2014|url=http://www.spaceflightnow.com/news/n1403/27ariane6/#.U2v3InLSW-M |publisher=Spaceflight Now|access-date=8 May 2014|archive-url=https://web.archive.org/web/20140512223359/http://www.spaceflightnow.com/news/n1403/27ariane6/#.U2v3InLSW-M|archive-date=12 May 2014|url-status=live}}</ref> However, after several permutations the finalized design was nearly identical in performance to the Ariane 5,<ref>{{cite web|url=http://www.arianespace.com/ariane-6/|title=Ariane 6 |publisher=Arianespace|access-date=11 December 2018|archive-url=https://web.archive.org/web/20181019213706/http://www.arianespace.com/ariane-6/|archive-date=19 October 2018|url-status=live}}</ref> focusing instead on lowering fabrication costs and launch prices. {{asof|2014|03}}, Ariane 6 was projected to be launched for about €70 million per flight, about half of the Ariane 5 price.<ref name=sfn201403327/>
The design brief of the next generation launch vehicle [[Ariane 6]] called for a lower-cost and smaller launch vehicle capable of launching a single satellite of up to {{cvt|6500|kg}} to GTO.<ref name=sfn201403327>{{cite web|last=Clark|first=Stephen|title=Germany calls for redesign of next-generation Ariane|date=27 March 2014|url=http://www.spaceflightnow.com/news/n1403/27ariane6/#.U2v3InLSW-M |publisher=Spaceflight Now|access-date=8 May 2014|archive-url=https://web.archive.org/web/20140512223359/http://www.spaceflightnow.com/news/n1403/27ariane6/#.U2v3InLSW-M|archive-date=12 May 2014|url-status=live}}</ref> However, after several permutations the finalized design was nearly identical in performance to the Ariane 5,<ref>{{cite web|url=http://www.arianespace.com/ariane-6/|title=Ariane 6 |publisher=Arianespace|access-date=11 December 2018|archive-url=https://web.archive.org/web/20181019213706/http://www.arianespace.com/ariane-6/|archive-date=19 October 2018|url-status=live}}</ref> focusing instead on lowering fabrication costs and launch prices. {{asof|2014|03}}, Ariane 6 was projected to be launched for about €70 million per flight, about half of the Ariane 5 price.<ref name=sfn201403327/>


Initially development of Ariane 6 was projected to cost €3.6 billion.<ref>{{cite press release|url=http://www.esa.int/For_Media/Press_Releases/Media_backgrounder_for_ESA_Council_at_Ministerial_Level|title=Media backgrounder for ESA Council at Ministerial Level|publisher=ESA|date=27 November 2014|access-date=24 March 2016}}</ref> In 2017, the ESA set 16 July 2020 as the deadline for the first flight.<ref>{{cite news|last1=Amos|first1=Jonathan|date=22 June 2017|title=Full thrust on Europe's new rocket|publisher=BBC News|url=https://www.bbc.com/news/science-environment-40366736|url-status=live|access-date=2022-01-25|archive-url=https://web.archive.org/web/20180322110946/http://www.bbc.com/news/science-environment-40366736|archive-date=22 March 2018}}</ref> The Ariane 6 successfully completed its maiden flight on 9 July 2024.
Initially development of Ariane 6 was projected to cost €3.6 billion.<ref>{{cite press release|url=http://www.esa.int/For_Media/Press_Releases/Media_backgrounder_for_ESA_Council_at_Ministerial_Level|title=Media backgrounder for ESA Council at Ministerial Level|publisher=ESA|date=27 November 2014|access-date=24 March 2016}}</ref> In 2017, the ESA set 16 July 2020 as the deadline for the first flight.<ref>{{cite news |last1=Amos |first1=Jonathan |date=22 June 2017 |title=Full thrust on Europe's new rocket |url=https://www.bbc.com/news/science-environment-40366736 |url-status=live |archive-url=https://web.archive.org/web/20180322110946/http://www.bbc.com/news/science-environment-40366736 |archive-date=22 March 2018 |access-date=2022-01-25 |work=BBC News}}</ref> The Ariane 6 successfully completed its maiden flight on 9 July 2024.


== Notable launches ==
== Notable launches ==
[[File:Ariane 5 10 2007.ogv|thumb|upright=1.0|right|Launch of the 34th Ariane 5 from [[Guiana Space Centre]]]]
[[File:Ariane 5 10 2007.ogv|thumb|upright=1.0|right|Launch of the 34th Ariane 5 from [[Guiana Space Centre]]]]


Ariane 5's first test flight ([[Ariane 5 Flight 501]]) on 4 June 1996 failed, with the rocket self-destructing 37 seconds after launch because of a malfunction in the control software.<ref>{{cite magazine |url=https://www.wired.com/2005/11/historys-worst-software-bugs/|magazine=Wired|title=History's Worst Software Bugs|access-date=3 September 2009|last1=Garfinkel|first1=Simson}}</ref> A data conversion from 64-[[bit]] [[floating-point arithmetic|floating-point]] value to 16-bit [[signedness|signed]] [[integer]] value to be stored in a variable representing horizontal bias caused a processor trap (operand error)<ref name="esamultimedia.esa.int"/> because the floating-point value was too large to be represented by a 16-bit signed integer. The software had been written for the [[Ariane 4]] where efficiency considerations (the computer running the software had an 80% maximum workload requirement<ref name="esamultimedia.esa.int"/>) led to four variables being protected with a [[Exception handling|handler]] while three others, including the horizontal bias variable, were left unprotected because it was thought that they were "physically limited or that there was a large margin of safety".<ref name="esamultimedia.esa.int"/> The software, written in [[Ada (programming language)|Ada]], was included in the Ariane 5 through the reuse of an entire Ariane 4 subsystem despite the fact that the particular software containing the bug, which was just a part of the subsystem, was not required by the Ariane 5 because it has a different preparation sequence than the Ariane 4.<ref name="esamultimedia.esa.int"/>
Ariane 5's first test flight ([[Ariane flight V88|Ariane 5 Flight 501]]) on 4 June 1996 failed, with the rocket self-destructing 37 seconds after launch because of a malfunction in the control software.<ref>{{cite magazine |url=https://www.wired.com/2005/11/historys-worst-software-bugs/|magazine=Wired|title=History's Worst Software Bugs|access-date=3 September 2009|last1=Garfinkel|first1=Simson}}</ref> A data conversion from 64-[[bit]] [[floating-point arithmetic|floating-point]] value to 16-bit [[signedness|signed]] [[integer]] value to be stored in a variable representing horizontal bias caused a processor trap (operand error)<ref name="esamultimedia.esa.int"/> because the floating-point value was too large to be represented by a 16-bit signed integer. The software had been written for the [[Ariane 4]] where efficiency considerations (the computer running the software had an 80% maximum workload requirement<ref name="esamultimedia.esa.int"/>) led to four variables being protected with a [[Exception handling|handler]] while three others, including the horizontal bias variable, were left unprotected because it was thought that they were "physically limited or that there was a large margin of safety".<ref name="esamultimedia.esa.int"/> The software, written in [[Ada (programming language)|Ada]], was included in the Ariane 5 through the reuse of an entire Ariane 4 subsystem despite the fact that the particular software containing the bug, which was just a part of the subsystem, was not required by the Ariane 5 because it has a different preparation sequence than the Ariane 4.<ref name="esamultimedia.esa.int"/>


The second test flight (L502, on 30 October 1997) was a partial failure. The Vulcain nozzle caused a roll problem, leading to premature shutdown of the core stage. The upper stage operated successfully, but it could not reach the intended orbit. A subsequent test flight (L503, on 21 October 1998) proved successful and the first commercial launch (L504) occurred on 10 December 1999 with the launch of the [[XMM-Newton]] X-ray observatory satellite.<ref>{{cite web|title=X-ray Satellite XMM-Newton Celebrates 20 Years in Space|date=December 10, 2019|url=https://www.nasa.gov/feature/goddard/2019/x-ray-satellite-xmm-newton-celebrates-20-years-in-space|publisher=NASA|access-date=March 27, 2023}}</ref>
The second test flight (L502, on 30 October 1997) was a partial failure. The Vulcain nozzle caused a roll problem, leading to premature shutdown of the core stage. The upper stage operated successfully, but it could not reach the intended orbit. A subsequent test flight (L503, on 21 October 1998) proved successful and the first commercial launch (L504) occurred on 10 December 1999 with the launch of the [[XMM-Newton]] X-ray observatory satellite.<ref>{{cite web|title=X-ray Satellite XMM-Newton Celebrates 20 Years in Space|date=December 10, 2019|url=https://www.nasa.gov/feature/goddard/2019/x-ray-satellite-xmm-newton-celebrates-20-years-in-space|publisher=NASA|access-date=March 27, 2023}}</ref>
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The next launch did not occur until 1 March 2002, when the [[Envisat]] [[environmental satellite]] successfully reached an orbit of {{cvt|800|km}} above the [[Earth]] in the 11th launch. At {{cvt|8111|kg}}, it was the heaviest single payload until the launch of the [[Jules Verne ATV|first ATV]] on 9 March 2008, at {{cvt|19360|kg}}.
The next launch did not occur until 1 March 2002, when the [[Envisat]] [[environmental satellite]] successfully reached an orbit of {{cvt|800|km}} above the [[Earth]] in the 11th launch. At {{cvt|8111|kg}}, it was the heaviest single payload until the launch of the [[Jules Verne ATV|first ATV]] on 9 March 2008, at {{cvt|19360|kg}}.


The first launch of the ECA variant on 11 December 2002 ended in failure when a main booster problem caused the rocket to veer off-course, forcing its self-destruction three minutes into the flight. Its payload of two communications satellites ([[STENTOR (satellite)|STENTOR]] and [[Hot Bird 7]]), valued at about €630 million, was lost in the [[Atlantic Ocean]]. The fault was determined to have been caused by a leak in coolant pipes allowing the nozzle to overheat. After this failure, [[Arianespace|Arianespace SA]] delayed the expected January 2003 launch for the [[Rosetta space probe|Rosetta]] mission to 26 February 2004, but this was again delayed to early March 2004 due to a minor fault in the foam that protects the cryogenic tanks on the Ariane 5. The failure of the first ECA launch was the last failure of an Ariane 5 until [[Ariane flight VA241|flight 240]] in January 2018.
The first launch of the ECA variant on 11 December 2002 ended in failure when a main booster problem caused the rocket to veer off-course, forcing its self-destruction three minutes into the flight. Its payload of two communications satellites ([[STENTOR (satellite)|STENTOR]] and [[Hot Bird 7]]), valued at about €630 million, was lost in the [[Atlantic Ocean]]. The fault was determined to have been caused by a leak in coolant pipes allowing the nozzle to overheat. After this failure, [[Arianespace|Arianespace SA]] delayed the expected January 2003 launch for the [[Rosetta space probe|Rosetta]] mission to 26 February 2004, but this was again delayed to early March 2004 due to a minor fault in the foam that protects the cryogenic tanks on the Ariane 5. The failure of the first ECA launch was the last failure of an Ariane 5 until [[Ariane flight VA241|flight 241]] in January 2018.


On 27 September 2003, the last Ariane 5G boosted three satellites (including the first European lunar probe, [[SMART-1]]), in Flight 162. On 18 July 2004, an Ariane 5G+ boosted what was at the time the heaviest telecommunication satellite ever, [[Anik (satellite)|Anik F2]], weighing almost {{cvt|6000|kg}}.
On 27 September 2003, the last Ariane 5G boosted three satellites (including the first European lunar probe, [[SMART-1]]), in Flight 162. On 18 July 2004, an Ariane 5G+ boosted what was at the time the heaviest telecommunication satellite ever, [[Anik (satellite)|Anik F2]], weighing almost {{cvt|6000|kg}}.
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=== VA241 anomaly ===
=== VA241 anomaly ===
{{main|Ariane 5 flight VA241}}
{{main|Ariane flight VA241}}


On 25 January 2018, an Ariane 5ECA launched [[SES-14]] and [[Al Yah Satellite Communications|Al Yah 3]] satellites. About 9 minutes and 28 seconds after launch, a telemetry loss occurred between the launch vehicle and the ground controllers. It was later confirmed, about 1 hour and 20 minutes after launch, that both satellites were successfully separated from the upper stage and were in contact with their respective ground controllers,<ref>{{cite web|url=https://spaceflightnow.com/2018/01/25/va-241-mission-status-center/|title=Live coverage: Ariane 5 launches with SES 14 and Al Yah 3 telecom satellites |author=Stephen Clark|publisher=Spaceflight Now|date=2 January 2018|access-date=26 January 2018|archive-url=https://web.archive.org/web/20180126004614/https://spaceflightnow.com/2018/01/25/va-241-mission-status-center/|archive-date=26 January 2018|url-status=live}}</ref> but that their orbital inclinations were incorrect as the guidance systems might have been compromised. Therefore, both satellites conducted orbital procedures, extending commissioning time.<ref name="va241-yahoo">{{cite news|title=Ariane 5 satellites in orbit but not in right location|url=https://sg.news.yahoo.com/ariane-5-satellites-orbit-not-location-031339516.html|access-date=26 January 2018|publisher=Yahoo! News|agency=AFP News|date=26 January 2018|archive-url=https://web.archive.org/web/20180126042057/https://sg.news.yahoo.com/ariane-5-satellites-orbit-not-location-031339516.html|archive-date=26 January 2018|url-status=live}}</ref> SES-14 needed about 8 weeks longer than planned commissioning time, meaning that entry into service was reported early September instead of July.<ref>{{cite web|title=SES-14 Goes Operational to Serve the Americas|url=https://www.ses.com/press-release/ses-14-goes-operational-serve-americas|access-date=26 September 2018 |publisher=SES|date=4 September 2018|archive-url=https://web.archive.org/web/20180904230118/https://www.ses.com/press-release/ses-14-goes-operational-serve-americas|archive-date=4 September 2018|url-status=live}}</ref> Nevertheless, SES-14 is still expected to be able to meet the designed lifetime. This satellite was originally to be launched with more propellant reserve on a [[Falcon 9]] launch vehicle since the Falcon 9, in this specific case, was intended to deploy this satellite into a high inclination orbit that would require more work from the satellite to reach its final geostationary orbit.<ref>{{cite news|title=SES Swaps SES-12 and SES-14 Launches|url=https://www.ses.com/press-release/ses-swaps-ses-12-and-ses-14-launches|access-date=17 February 2018|publisher=SES|date=28 August 2018|archive-url=https://web.archive.org/web/20180201030540/https://www.ses.com/press-release/ses-swaps-ses-12-and-ses-14-launches|archive-date=1 February 2018|url-status=live}}</ref> The Al Yah 3 was also confirmed healthy after more than 12 hours without further statement, and like SES-14, Al Yah 3's maneuvering plan was also revised to still fulfill the original mission.<ref>{{cite web|title=Yahsat confirms launch of Al Yah 3 mission Satellite to greatly increase its global coverage|url=http://www.journeyofpride.com/yahsat-confirms-launch-of-al-yah-3-mission-satellite-to-greatly-increase-its-global-coverage/ |website=journeyofpride.com|access-date=26 January 2018|archive-url=https://web.archive.org/web/20180127093940/http://www.journeyofpride.com/yahsat-confirms-launch-of-al-yah-3-mission-satellite-to-greatly-increase-its-global-coverage/|archive-date=27 January 2018|url-status=live}}</ref> As of 16 February 2018, Al Yah 3 was approaching the intended geostationary orbit, after series of recovery maneuvers had been performed.<ref>{{cite news|last1=McDowell|first1=Jonathan|title=The Al Yah 3 satellite put in the wrong orbit by the last Ariane launch is now approaching GEO; current orbit 22.5 hr period, 20828 x 47262 km x 6.2°|url=https://twitter.com/planet4589/status/964284086503247872|access-date=17 February 2018|work=@planet4589|date=16 February 2018}}</ref> The investigation showed that invalid inertial units' azimuth value had sent the vehicle 17° off course but to the intended altitude, they had been programmed for the standard geostationary transfer orbit of 90° when the payloads were intended to be 70° for this supersynchronous transfer orbit mission, 20° off norme.<ref name="arianespace.com">{{cite web|title=Independent Enquiry Commission announces conclusions concerning the launcher trajectory deviation during Flight VA241|url=http://www.arianespace.com/press-release/independent-enquiry-commission-announces-conclusions-concerning-the-launcher-trajectory-deviation-during-flight-va241/|publisher=Arianespace|access-date=23 February 2018|archive-url=https://web.archive.org/web/20180223182356/http://www.arianespace.com/press-release/independent-enquiry-commission-announces-conclusions-concerning-the-launcher-trajectory-deviation-during-flight-va241/|archive-date=23 February 2018|url-status=live}}</ref> This mission anomaly ended the 82 consecutive launch success streak from 2003.<ref>{{cite news|last1=Neiberlien |first1=Henry|title=After 16 years, Ariane 5 finally fails|url=http://theavion.com/after-16-years-ariane-5-finally-fails/|access-date=30 January 2018|publisher=The Avion|date=29 January 2018|archive-url=https://web.archive.org/web/20180130204259/http://theavion.com/after-16-years-ariane-5-finally-fails/|archive-date=30 January 2018|url-status=live}}</ref>
On 25 January 2018, an Ariane 5ECA launched [[SES-14]] and [[Al Yah Satellite Communications|Al Yah 3]] satellites. About 9 minutes and 28 seconds after launch, a telemetry loss occurred between the launch vehicle and the ground controllers. It was later confirmed, about 1 hour and 20 minutes after launch, that both satellites were successfully separated from the upper stage and were in contact with their respective ground controllers,<ref>{{cite web |author=Clark |first=Stephen |date=2 January 2018 |title=Live coverage: Ariane 5 launches with SES 14 and Al Yah 3 telecom satellites |url=https://spaceflightnow.com/2018/01/25/va-241-mission-status-center/ |url-status=live |archive-url=https://web.archive.org/web/20180126004614/https://spaceflightnow.com/2018/01/25/va-241-mission-status-center/ |archive-date=26 January 2018 |access-date=26 January 2018 |publisher=Spaceflight Now}}</ref> but that their orbital inclinations were incorrect as the guidance systems might have been compromised. Therefore, both satellites conducted orbital procedures, extending commissioning time.<ref name="va241-yahoo">{{cite news |date=26 January 2018 |title=Ariane 5 satellites in orbit but not in right location |url=https://sg.news.yahoo.com/ariane-5-satellites-orbit-not-location-031339516.html |url-status=live |archive-url=https://web.archive.org/web/20180126042057/https://sg.news.yahoo.com/ariane-5-satellites-orbit-not-location-031339516.html |archive-date=26 January 2018 |access-date=26 January 2018 |work=Yahoo! News |agency=AFP News}}</ref> SES-14 needed about 8 weeks longer than planned commissioning time, meaning that entry into service was reported early September instead of July.<ref>{{cite web|title=SES-14 Goes Operational to Serve the Americas|url=https://www.ses.com/press-release/ses-14-goes-operational-serve-americas|access-date=26 September 2018 |publisher=SES|date=4 September 2018|archive-url=https://web.archive.org/web/20180904230118/https://www.ses.com/press-release/ses-14-goes-operational-serve-americas|archive-date=4 September 2018|url-status=live}}</ref> Nevertheless, SES-14 is still expected to be able to meet the designed lifetime. This satellite was originally to be launched with more propellant reserve on a [[Falcon 9]] launch vehicle since the Falcon 9, in this specific case, was intended to deploy this satellite into a high inclination orbit that would require more work from the satellite to reach its final geostationary orbit.<ref>{{cite news|title=SES Swaps SES-12 and SES-14 Launches|url=https://www.ses.com/press-release/ses-swaps-ses-12-and-ses-14-launches|access-date=17 February 2018|publisher=SES|date=28 August 2018|archive-url=https://web.archive.org/web/20180201030540/https://www.ses.com/press-release/ses-swaps-ses-12-and-ses-14-launches|archive-date=1 February 2018|url-status=live}}</ref> The Al Yah 3 was also confirmed healthy after more than 12 hours without further statement, and like SES-14, Al Yah 3's maneuvering plan was also revised to still fulfill the original mission.<ref>{{cite web|title=Yahsat confirms launch of Al Yah 3 mission Satellite to greatly increase its global coverage|url=http://www.journeyofpride.com/yahsat-confirms-launch-of-al-yah-3-mission-satellite-to-greatly-increase-its-global-coverage/ |website=journeyofpride.com|access-date=26 January 2018|archive-url=https://web.archive.org/web/20180127093940/http://www.journeyofpride.com/yahsat-confirms-launch-of-al-yah-3-mission-satellite-to-greatly-increase-its-global-coverage/|archive-date=27 January 2018|url-status=live}}</ref> As of 16 February 2018, Al Yah 3 was approaching the intended geostationary orbit, after series of recovery maneuvers had been performed.<ref>{{cite tweet |number=964284086503247872 |user=planet4589 |title=The Al Yah 3 satellite put in the wrong orbit by the last Ariane launch is now approaching GEO; current orbit 22.5 hr period, 20828 x 47262 km x 6.2° |first1=Jonathan |last=McDowell |date=16 February 2018 |access-date=17 February 2018}}</ref> The investigation showed that invalid inertial units' azimuth value had sent the vehicle 17° off course but to the intended altitude, they had been programmed for the standard geostationary transfer orbit of 90° when the payloads were intended to be 70° for this supersynchronous transfer orbit mission, 20° off norme.<ref name="arianespace.com">{{cite web|title=Independent Enquiry Commission announces conclusions concerning the launcher trajectory deviation during Flight VA241|url=http://www.arianespace.com/press-release/independent-enquiry-commission-announces-conclusions-concerning-the-launcher-trajectory-deviation-during-flight-va241/|publisher=Arianespace|access-date=23 February 2018|archive-url=https://web.archive.org/web/20180223182356/http://www.arianespace.com/press-release/independent-enquiry-commission-announces-conclusions-concerning-the-launcher-trajectory-deviation-during-flight-va241/|archive-date=23 February 2018|url-status=live}}</ref> This mission anomaly ended the 82 consecutive launch success streak from 2003.<ref>{{cite news |last1=Neiberlien |first1=Henry |date=29 January 2018 |title=After 16 years, Ariane 5 finally fails |url=http://theavion.com/after-16-years-ariane-5-finally-fails/ |url-status=dead |archive-url=https://web.archive.org/web/20180130204259/http://theavion.com/after-16-years-ariane-5-finally-fails/ |archive-date=30 January 2018 |access-date=30 January 2018 |work=The Avion}}</ref>


== Launch history ==
== Launch history ==
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| group names = G : G+ : GS : ES : ECA
| group names = G : G+ : GS : ES : ECA
| units suffix = _flights
| units suffix = _flights
| x legends = 1996 :::: 2000 :::: 2004 :::: 2008 :::: 2012 :::: 2016 :::: 2020 :::
| x legends = 1996 :::: 2000 :::: 2004 :::: 2008 :::: 2012 :::: 2016 :::: 2020 :::'23
}}
}}
{{column}}
{{column}}
Line 367: Line 372:
| group names = Failure : Partial failure : Success
| group names = Failure : Partial failure : Success
| units suffix = _flights
| units suffix = _flights
| x legends = 1996 :::: 2000 :::: 2004 :::: 2008 :::: 2012 :::: 2016 :::: 2020 :::
| x legends = 1996 :::: 2000 :::: 2004 :::: 2008 :::: 2012 :::: 2016 :::: 2020 :::'23
}}
}}


Line 377: Line 382:
All launches are from [[Guiana Space Centre]], [[ELA-3]].
All launches are from [[Guiana Space Centre]], [[ELA-3]].


{| class="wikitable sortable mw-collapsible plainrowheaders" style="width: 100%;"
{{sticky header}}
{| class="wikitable sticky-header sortable mw-collapsible plainrowheaders" style="width: 100%;"
|-
|-
! scope="col" | #
! scope="col" | #
Line 459: Line 465:
| 14 September 2000<br/>22:54<ref name="EA-A5"/>
| 14 September 2000<br/>22:54<ref name="EA-A5"/>
| G<br/>506
| G<br/>506
| [[Astra 2B]]<br/>[[GE-7]]
| [[Astra 2B]]<br/>[[AMC-7|GE-7]]
| ~4,700&nbsp;kg
| ~4,700&nbsp;kg
| [[Geostationary transfer orbit|GTO]]
| [[Geostationary transfer orbit|GTO]]
Line 537: Line 543:
| 5 July 2002<br/>23:22<ref name="EA-A5"/>
| 5 July 2002<br/>23:22<ref name="EA-A5"/>
| G<br/>512
| G<br/>512
| [[Stellat 5]]<br/>[[N-STAR c]]
| [[Eutelsat 5 West A|Stellat 5]]<br/>[[N-STAR c]]
| ~6,700&nbsp;kg
| ~6,700&nbsp;kg
| [[Geostationary transfer orbit|GTO]]
| [[Geostationary transfer orbit|GTO]]
Line 563: Line 569:
| 11 December 2002<br/>22:22<ref name="EA-A5"/>
| 11 December 2002<br/>22:22<ref name="EA-A5"/>
| ECA<br/>517
| ECA<br/>517
| [[Hot Bird 7]]<br/>[[Stentor (satellite)|Stentor]]<br/>[[Modular Fitting Dummy|MFD-A]]<br/>[[Modular Fitting Dummy|MFD-B]]
| [[Hot Bird 7]]<br/>[[STENTOR (satellite)|STENTOR]]<br/>[[Modular Fitting Dummy|MFD-A]]<br/>[[Modular Fitting Dummy|MFD-B]]
|  
|  
| [[Geostationary transfer orbit|GTO]] (planned)
| [[Geostationary transfer orbit|GTO]] (planned)
Line 1,862: Line 1,868:
| 7 September 2022<br/>21:45
| 7 September 2022<br/>21:45
| ECA<br/>5117
| ECA<br/>5117
| [[Eutelsat Konnect]] VHTS
| [[Eutelsat Konnect VHTS]]
| 6,400&nbsp;kg
| 6,400&nbsp;kg
| [[Geostationary transfer orbit|GTO]]
| [[Geostationary transfer orbit|GTO]]
Line 1,873: Line 1,879:
| 13 December 2022<br/>20:30
| 13 December 2022<br/>20:30
| ECA<br/>5118
| ECA<br/>5118
| [[Galaxy (satellite)|Galaxy 35]]<br/>[[Galaxy (satellite)|Galaxy 36]]<br/>[[Meteosat|MTG-I1]]
| [[Galaxy (satellite)|Galaxy 35]]<br/>[[Galaxy (satellite)|Galaxy 36]]<br/>[[MTG-I1]]
| 10,972&nbsp;kg<ref>{{Cite web|title=DutchSpace on Twitter|url=https://twitter.com/DutchSpace/status/1603010450765004804|access-date=2022-12-14|website=Twitter|language=en-US}}</ref>
| 10,972&nbsp;kg<ref>{{Cite web|title=DutchSpace on Twitter|url=https://twitter.com/DutchSpace/status/1603010450765004804|access-date=2022-12-14|website=Twitter|language=en-US}}</ref>
| [[Geostationary transfer orbit|GTO]]
| [[Geostationary transfer orbit|GTO]]
Line 1,881: Line 1,887:


|116
|116
! scope="row" |VA-260
! scope="row" | [[Ariane flight VA260|VA-260]]
| 14 April 2023<br/>12:14
| 14 April 2023<br/>12:14
| ECA<br/>5120
| ECA<br/>5120
Line 1,892: Line 1,898:


|rowspan=2|117
|rowspan=2|117
! scope="row" rowspan=2 | VA-261
! scope="row" rowspan=2 | [[Ariane flight VA261|VA-261]]
| 5 July 2023<br/>22:00
| 5 July 2023<br/>22:00
| ECA<br/>5119
| ECA<br/>5119
| [[Syracuse (satellite)|Syracuse 4B]] (Comsat-NG 2)<ref>{{Cite web |last=Foust |first=Jeff |date=10 September 2019 |title=Airbus and Telespazio to sell excess capacity on Syracuse 4 satellites |url=https://spacenews.com/airbus-and-telespazio-to-sell-excess-capacity-on-syracuse-4-satellites/ |access-date=7 September 2022 |website=[[SpaceNews]]}}</ref> <br />Heinrich Hertz (H2Sat)
| [[Syracuse (satellite)|Syracuse 4B]] (Comsat-NG 2)<ref>{{Cite web |last=Foust |first=Jeff |date=10 September 2019 |title=Airbus and Telespazio to sell excess capacity on Syracuse 4 satellites |url=https://spacenews.com/airbus-and-telespazio-to-sell-excess-capacity-on-syracuse-4-satellites/ |access-date=7 September 2022 |website=[[SpaceNews]]}}</ref> <br />[[Heinrich Hertz (satellite)|Heinrich Hertz]] (H2Sat)
| 7,679.8&nbsp;kg<ref>{{Cite web|title=DutchSpace on Twitter|url=https://twitter.com/DutchSpace/status/1676707641182101505|access-date=2023-08-06|website=Twitter|language=en-US}}</ref>
| 7,679.8&nbsp;kg<ref>{{Cite web|title=DutchSpace on Twitter|url=https://twitter.com/DutchSpace/status/1676707641182101505|access-date=2023-08-06|website=Twitter|language=en-US}}</ref>
| [[Geostationary transfer orbit|GTO]]
| [[Geostationary transfer orbit|GTO]]
Line 1,918: Line 1,924:


==References==
==References==
{{reflist|refs=
<references>
 
<ref name="esamultimedia.esa.int">{{cite web |url=http://esamultimedia.esa.int/docs/esa-x-1819eng.pdf |title=Ariane 5 Flight 501 Failure, Report by the Inquiry Board |website=esamultimedia.esa.int |url-status=dead |archive-url=https://web.archive.org/web/20000815230639/http://www.esrin.esa.it/htdocs/tidc/Press/Press96/ariane5rep.html |archive-date=15 August 2000}}</ref>
<ref name="esamultimedia.esa.int">{{cite web |url=http://esamultimedia.esa.int/docs/esa-x-1819eng.pdf |title=Ariane 5 Flight 501 Failure, Report by the Inquiry Board |website=esamultimedia.esa.int |url-status=dead |archive-url=https://web.archive.org/web/20000815230639/http://www.esrin.esa.it/htdocs/tidc/Press/Press96/ariane5rep.html |archive-date=15 August 2000}}</ref>


<ref name="EA-A5">{{cite encyclopedia |url=http://www.astronautix.com/a/ariane5.html |archive-url=https://web.archive.org/web/20161013130033/http://www.astronautix.com/a/ariane5.html |url-status=dead |archive-date=13 October 2016 |encyclopedia=Encyclopedia Astronautica |title=Ariane 5}}</ref>
<ref name="EA-A5">{{cite encyclopedia |url=http://www.astronautix.com/a/ariane5.html |archive-url=https://web.archive.org/web/20161013130033/http://www.astronautix.com/a/ariane5.html |url-status=dead |archive-date=13 October 2016 |encyclopedia=Encyclopedia Astronautica |title=Ariane 5}}</ref>
}}
 
</references>


== External links ==
== External links ==

Latest revision as of 15:28, 18 November 2025

Template:Short description Template:Use British English Template:Use dmy dates Script error: No such module "infobox".Script error: No such module "Check for unknown parameters".

Ariane 5 is a retired European heavy-lift space launch vehicle operated by Arianespace for the European Space Agency (ESA). It was launched from the Guiana Space Centre (CSG) in French Guiana. It was used to deliver payloads into geostationary transfer orbit (GTO), low Earth orbit (LEO) or further into space. The launch vehicle had a streak of 82 consecutive successful launches between 9 April 2003 and 12 December 2017. In development since 2014,[1] Ariane 6, a direct successor system was first launched in 2024.[2]

The system was designed as an expendable launch vehicle by the Centre national d'études spatiales (CNES), the French government's space agency, in cooperation with various European partners. Despite not being a direct derivative of its predecessor launch vehicle program, it was classified as part of the Ariane rocket family. Aérospatiale, and later ArianeGroup, was the prime contractor for the manufacturing of the vehicles, leading a multi-country consortium of other European contractors. Ariane 5 was originally intended to launch the Hermes spacecraft, and thus it was rated for human space launches.

Since its first launch, Ariane 5 was refined in successive versions: "G", "G+", "GS", "ECA", and finally, "ES". The system had a commonly used dual-launch capability, where up to two large geostationary belt communication satellites can be mounted using a SYLDA (Système de Lancement Double Ariane, meaning "Ariane Double-Launch System") carrier system. Up to three, somewhat smaller, main satellites are possible depending on size using a SPELTRA (Structure Porteuse Externe Lancement Triple Ariane, which translates to "Ariane Triple-Launch External Carrier Structure"). Up to eight secondary payloads, usually small experiment packages or minisatellites, could be carried with an ASAP (Ariane Structure for Auxiliary Payloads) platform.

Following the launch of 15 August 2020, Arianespace signed the contracts for the last eight Ariane 5 launches, before it was succeeded by the new Ariane 6 launcher, according to Daniel Neuenschwander, director of space transportation at the ESA.[3][2] Ariane 5 flew its final mission on 5 July 2023.[4]

Vehicle description

Cryogenic main stage

File:SNECMA Vulcain II.jpg
Vulcain engine

Ariane 5's cryogenic H173 main stage (H158 for Ariane 5G, G+, and GS) was called the EPC (Étage Principal Cryotechnique — Cryotechnic Main Stage). It consisted of a Template:Cvt diameter by Template:Cvt high tank with two compartments, one for liquid oxygen and one for liquid hydrogen, and a Vulcain 2 engine at the base with a vacuum thrust of Template:Cvt. The H173 EPC weighed about Template:Cvt, including Template:Cvt of propellant.[5] After the main cryogenic stage runs out of fuel, it re-entered the atmosphere for an ocean splashdown.

Solid boosters

Attached to the sides were two P241 (P238 for Ariane 5G and G+) solid rocket boosters (SRBs or EAPs from the French Étages d'Accélération à PoudreTemplate:Literal translation), each weighing about Template:Cvt full and delivering a thrust of about Template:Cvt. They were fueled by a mix of ammonium perchlorate (68%) and aluminium fuel (18%) and HTPB (14%). They each burned for 130 seconds before being dropped into the ocean. The SRBs were usually allowed to sink to the bottom of the ocean, but, like the Space Shuttle Solid Rocket Boosters, they could be recovered with parachutes, and this was occasionally done for post-flight analysis. Unlike Space Shuttle SRBs, Ariane 5 boosters were not reused. The most recent attempt was for the first Ariane 5 ECA mission in 2009. One of the two boosters was successfully recovered and returned to the Guiana Space Center for analysis.[6] Prior to that mission, the last such recovery and testing was done in 2003.Script error: No such module "Unsubst".

The French M51 submarine-launched ballistic missile (SLBM) shared a substantial amount of technology with these boosters.[7]

In February 2000, the suspected nose cone of an Ariane 5 booster washed ashore on the South Texas coast, and was recovered by beachcombers before the government could get to it.[8]

Second stage

File:Ariane 5 EPS Upper Stage.jpg
EPS Upper Stage used on Ariane 5ES

The second stage was on top of the main stage and below the payload. The original Ariane — Ariane 5G — used the EPS (Étage à Propergols Stockables — Storable Propellant Stage), which was fueled by monomethylhydrazine (MMH) and nitrogen tetroxide, containing Template:Cvt of storable propellant. The EPS was subsequently improved for use on the Ariane 5G+, GS, and ES.

The EPS upper stage was capable of repeated ignition, first demonstrated during flight V26 which was launched on 5 October 2007. This was purely to test the engine, and occurred after the payloads had been deployed. The first operational use of restart capability as part of a mission came on 9 March 2008, when two burns were made to deploy the first Automated Transfer Vehicle (ATV) into a circular parking orbit, followed by a third burn after ATV deployment to de-orbit the stage. This procedure was repeated for all subsequent ATV flights.

Ariane 5ECA used the ESC (Étage Supérieur Cryotechnique — Cryogenic Upper Stage), which was fueled by liquid hydrogen and liquid oxygen. The ESC used the HM7B engine previously used in the Ariane 4 third stage. The propellent load of 14.7 tonne allowed the engine to burn for 945 seconds while providing 6.5 tonne of thrust. The ESC provided roll control during powered flight and full attitude control during payload separation using hydrogen gas thrusters. Oxygen gas thrusters allowed longitudinal acceleration after engine cutoff. The flight assembly included the Vehicle Equipment Bay, with flight electronics for the entire rocket, and the payload interface and structural support.[9][10]

Fairing

The payload and all upper stages were covered at launch by a fairing for aerodynamic stability and protection from heating during supersonic flight and acoustic loads. It was jettisoned once sufficient altitude has been reached, typically above Template:Convert. It was made by Ruag Space and since flight VA-238 it was composed of 4 panels.[11]Template:Clarify

Launch preparations

With the exception of the solid rocket boosters (for safety and cost reasons), the components were assembled in Europe, and then shipped to French Guyana by boat. Once at Kourou, the components were assembled in the Launcher Integration Building (BIL), then transfered into the Final Assembly Building (BAF) for mating the payload and fairing, before the completed rocket was transfered to the Launch Zone (ZL) for fueling and launch. [12]

Variants

Variant Description
G The original version was dubbed Ariane 5G (Generic) and had a launch mass of Template:Cvt. Its payload capability to geostationary transfer orbit (GTO) was Template:Cvt for a single satellite or Template:Cvt for dual launches. It flew 16 times with one failure and two partial failures.[13]
G+ The Ariane 5G+ had an improved EPS second stage, with a GTO capacity of Template:Cvt for a single payload or Template:Cvt for two. It flew three times in 2004, with no failures.[14]
GS At the time of the failure of the first Ariane 5ECA flight in 2002, all Ariane 5 launchers in production were ECA versions. Some of the ECA cores were modified to use the original Vulcain engine and tank volumes while the failure was investigated; these vehicles were designated Ariane 5GS. The GS used the improved EAP boosters of the ECA variant and the improved EPS of the G+ variant, but the increased mass of the modified ECA core compared to the G and G+ core resulted in slightly reduced payload capacity.[15] Ariane 5GS could carry a single payload of Template:Cvt or a dual payload of Template:Cvt to GTO. The Ariane 5GS flew 6 times from 2005 to 2009 with no failures.[16]
ECA The Ariane 5ECA (Evolution Cryotechnique type A), first flown in 2002 but ending in failure, and first successfully flown in 2005, used an improved Vulcain 2 first-stage engine with a longer, more efficient nozzle with a more efficient flow cycle and denser propellant ratio. The new ratio required length modifications to the first-stage tanks. The EPS second stage was replaced by the ESC-A (Etage Supérieur Cryogénique-A), which had a dry weight of Template:Cvt and was powered by an HM-7B engine burning Template:Cvt of cryogenic propellant. The ESC-A used the liquid oxygen tank and lower structure from the Ariane 4's H10 third stage, mated to a new liquid hydrogen tank. Additionally, the EAP booster casings were lightened with new welds and carry more propellant. The Ariane 5ECA started with a GTO launch capacity of Template:Cvt for dual payloads or Template:Cvt for a single payload.[17] Later batches: PB+ and PC, increased the max payload to GTO to Template:Cvt.[18] The Ariane 5 ECA flew 72 times from 2002 to 2019 with one failure and one partial failure.
ECA+ The Ariane 5ECA+ (Evolution Cryotechnique type A+), first successfully flown in 2019, used an improved ESC-D (Etage Supérieur Cryogénique-D).[19]
ES The Ariane 5ES (Evolution Storable) had an estimated LEO launch capacity of Template:Cvt. It included all the performance improvements of Ariane 5ECA core and boosters but replaced the ESC-A second stage with the restartable EPS used on Ariane 5GS variants. It was used to launch the Automated Transfer Vehicle (ATV) into a Template:Cvt circular low Earth orbit inclined at 51.6° and was used 3 times to launch 4 Galileo navigation satellites at a time directly into their operational orbit.[20] The Ariane 5ES flew 8 times from 2008 to 2018 with no failures.
ME
(cancelled)
The Ariane 5ME (Mid-life Evolution) was under development until December 2014 when funding was cut in favour of developing Ariane 6. Last activities for Ariane 5ME were completed at the end of 2015. Vinci upper stage engine, under development for the 5ME, transferred to Ariane 6.

Launch pricing and market competition

Template:Asof, the Ariane 5 commercial launch price for launching a "midsize satellite in the lower position" was approximately €50 million,[21] competing for commercial launches in an increasingly competitive market.

The heavier satellite was launched in the upper position on a typical dual-satellite Ariane 5 launch and was priced higher than the lower satellite,[22]Template:Clarify on the order of €90 million Template:Asof.[23][24]

Total launch price of an Ariane 5 – which could transport up to two satellites to space, one in the "upper" and one in the "lower" positions – was around €150 million Template:As of.[24]

Cancelled plans for future developments

File:Belgian components for the Ariane 5 rocket.jpg
Belgian components produced for the Ariane 5 European heavy-lift launch vehicle explained

Ariane 5 ME

The Ariane 5 ME (Mid-life Evolution) was in development into early 2015, and was seen as a stopgap between Ariane 5ECA/Ariane 5ES and the new Ariane 6. With first flight planned for 2018, it would have become ESA's principal launcher until the arrival of the new Ariane 6 version. ESA halted funding for the development of Ariane 5ME in late 2014 to prioritize development of Ariane 6.[25]

The Ariane 5ME was to use a new upper stage, with increased propellant volume, powered by the new Vinci engine. Unlike the HM-7B engine, it was to be able to restart several times, allowing for complex orbital maneuvers such as insertion of two satellites into different orbits, direct insertion into geosynchronous orbit, planetary exploration missions, and guaranteed upper stage deorbiting or insertion into graveyard orbit.[26][27] The launcher was also to include a lengthened fairing up to Template:Cvt and a new dual launch system to accommodate larger satellites. Compared to an Ariane 5ECA model, the payload to GTO was to increase by 15% to Template:Cvt and the cost-per-kilogram of each launch was projected to decline by 20%.[26]

Development

Originally known as the Ariane 5ECB, Ariane 5ME was to have its first flight in 2006. However, the failure of the first ECA flight in 2002, combined with a deteriorating satellite industry, caused ESA to cancel development in 2003.[28] Development of the Vinci engine continued, though at a lower pace. The ESA Council of Ministers agreed to fund development of the new upper stage in November 2008.[29]

In 2009, EADS Astrium was awarded a €200 million contract,[30] and on 10 April 2012 received another €112 million contract to continue development of the Ariane 5ME [31] with total development effort expected to cost €1 billion.[32]

On 21 November 2012, ESA agreed to continue with the Ariane 5ME to meet the challenge of lower priced competitors. It was agreed the Vinci upper stage would also be used as the second stage of a new Ariane 6, and further commonality would be sought.[27] Ariane 5ME qualification flight was scheduled for mid-2018, followed by gradual introduction into service.[26]

On 2 December 2014, ESA decided to stop funding the development of Ariane 5ME and instead focus on Ariane 6, which was expected to have a lower cost per launch and allow more flexibility in the payloads (using two or four P120C solid boosters depending on total payload mass).[25]

Solid propellant stage

Work on the Ariane 5 EAP motors was continued in the Vega programme. The Vega 1st stage engine – the P80 engine – was a shorter derivation of the EAP.[33] The P80 booster casing was made of filament wound graphite epoxy, much lighter than the current stainless steel casing. A new composite steerable nozzle was developed while new thermal insulation material and a narrower throat improved the expansion ratio and subsequently the overall performance. Additionally, the nozzle had electromechanical actuators which replaced the heavier hydraulic ones used for thrust vector control.

These developments could maybe have made their way back into the Ariane programme, but this was most likely an inference based on early blueprints of the Ariane 6 having a central P80 booster and 2-4 around the main one.[27][34] The incorporation of the ESC-B with the improvements to the solid motor casing and an uprated Vulcain engine would have delivered Template:Cvt to LEO. This would have been developed for any lunar missions but the performance of such a design might not have been possible if the higher Max-Q for the launch of this launch vehicle would have posed a constraint on the mass delivered to orbit.[35]

Ariane 6

Script error: No such module "Labelled list hatnote".

The design brief of the next generation launch vehicle Ariane 6 called for a lower-cost and smaller launch vehicle capable of launching a single satellite of up to Template:Cvt to GTO.[36] However, after several permutations the finalized design was nearly identical in performance to the Ariane 5,[37] focusing instead on lowering fabrication costs and launch prices. Template:Asof, Ariane 6 was projected to be launched for about €70 million per flight, about half of the Ariane 5 price.[36]

Initially development of Ariane 6 was projected to cost €3.6 billion.[38] In 2017, the ESA set 16 July 2020 as the deadline for the first flight.[39] The Ariane 6 successfully completed its maiden flight on 9 July 2024.

Notable launches

File:Ariane 5 10 2007.ogv
Launch of the 34th Ariane 5 from Guiana Space Centre

Ariane 5's first test flight (Ariane 5 Flight 501) on 4 June 1996 failed, with the rocket self-destructing 37 seconds after launch because of a malfunction in the control software.[40] A data conversion from 64-bit floating-point value to 16-bit signed integer value to be stored in a variable representing horizontal bias caused a processor trap (operand error)[41] because the floating-point value was too large to be represented by a 16-bit signed integer. The software had been written for the Ariane 4 where efficiency considerations (the computer running the software had an 80% maximum workload requirement[41]) led to four variables being protected with a handler while three others, including the horizontal bias variable, were left unprotected because it was thought that they were "physically limited or that there was a large margin of safety".[41] The software, written in Ada, was included in the Ariane 5 through the reuse of an entire Ariane 4 subsystem despite the fact that the particular software containing the bug, which was just a part of the subsystem, was not required by the Ariane 5 because it has a different preparation sequence than the Ariane 4.[41]

The second test flight (L502, on 30 October 1997) was a partial failure. The Vulcain nozzle caused a roll problem, leading to premature shutdown of the core stage. The upper stage operated successfully, but it could not reach the intended orbit. A subsequent test flight (L503, on 21 October 1998) proved successful and the first commercial launch (L504) occurred on 10 December 1999 with the launch of the XMM-Newton X-ray observatory satellite.[42]

Another partial failure occurred on 12 July 2001, with the delivery of two satellites into an incorrect orbit, at only half the height of the intended GTO. The ESA Artemis telecommunications satellite was able to reach its intended orbit on 31 January 2003, through the use of its experimental ion propulsion system.

The next launch did not occur until 1 March 2002, when the Envisat environmental satellite successfully reached an orbit of Template:Cvt above the Earth in the 11th launch. At Template:Cvt, it was the heaviest single payload until the launch of the first ATV on 9 March 2008, at Template:Cvt.

The first launch of the ECA variant on 11 December 2002 ended in failure when a main booster problem caused the rocket to veer off-course, forcing its self-destruction three minutes into the flight. Its payload of two communications satellites (STENTOR and Hot Bird 7), valued at about €630 million, was lost in the Atlantic Ocean. The fault was determined to have been caused by a leak in coolant pipes allowing the nozzle to overheat. After this failure, Arianespace SA delayed the expected January 2003 launch for the Rosetta mission to 26 February 2004, but this was again delayed to early March 2004 due to a minor fault in the foam that protects the cryogenic tanks on the Ariane 5. The failure of the first ECA launch was the last failure of an Ariane 5 until flight 241 in January 2018.

On 27 September 2003, the last Ariane 5G boosted three satellites (including the first European lunar probe, SMART-1), in Flight 162. On 18 July 2004, an Ariane 5G+ boosted what was at the time the heaviest telecommunication satellite ever, Anik F2, weighing almost Template:Cvt.

The first successful launch of the Ariane 5ECA took place on 12 February 2005. The payload consisted of the XTAR-EUR military communications satellite, a 'SLOSHSAT' small scientific satellite and a MaqSat B2 payload simulator. The launch had been scheduled for October 2004, but additional testing and a military launch (of a Helios 2A observation satellite) delayed the attempt.

On 11 August 2005, the first Ariane 5GS (featuring the Ariane 5ECA's improved solid motors) boosted Thaicom 4, the heaviest telecommunications satellite to date at Template:Cvt,[43] into orbit.

On 16 November 2005, the third Ariane 5ECA launch (the second successful ECA launch) took place. It carried a dual payload consisting of Spaceway F2 for DirecTV and Telkom-2 for PT Telekomunikasi of Indonesia. This was the launch vehicle's heaviest dual payload to date, at more than Template:Cvt.

On 27 May 2006, an Ariane 5ECA launch vehicle set a new commercial payload lifting record of Template:Cvt. The dual-payload consisted of the Thaicom 5 and Satmex 6 satellites.[44]

On 4 May 2007, the Ariane 5ECA set another new commercial record, lifting into transfer orbit the Astra 1L and Galaxy 17 communication satellites with a combined weight of Template:Cvt, and a total payload weight of Template:Cvt.[45] This record was again broken by another Ariane 5ECA, launching the Skynet 5B and Star One C1 satellites, on 11 November 2007. The total payload weight for this launch was of Template:Cvt.[46]

On 9 March 2008, the first Ariane 5ES-ATV was launched to deliver the first ATV called Jules Verne to the International Space Station (ISS). The ATV was the heaviest payload ever launched by a European launch vehicle, providing supplies to the space station with necessary propellant, water, air and dry cargo. This was the first operational Ariane mission which involved an engine restart in the upper stage. The ES-ATV Aestus EPS upper stage was restartable while the ECA HM7-B engine was not.

On 1 July 2009, an Ariane 5ECA launched TerreStar-1 (now EchoStar T1), which was then, at Template:Cvt, the largest and most massive commercial telecommunication satellite ever built at that time[47] until being overtaken by Telstar 19 Vantage, at Template:Cvt, launched aboard Falcon 9. The satellite was launched into a lower-energy orbit than a usual GTO, with its initial apogee at roughly Template:Cvt.[48]

On 28 October 2010, an Ariane 5ECA launched Eutelsat's W3B (part of its W Series of satellites) and Broadcasting Satellite System Corporation (B-SAT)'s BSAT-3b satellites into orbit. But the W3B satellite failed to operate shortly after the successful launch and was written off as a total loss due to an oxidizer leak in the satellite's main propulsion system.[49] The BSAT-3b satellite, however, is operating normally.[50]

The VA253 launch on 15 August 2020 introduced two small changes that increased lift capacity by about Template:Cvt; these were a lighter avionics and guidance-equipment bay, and modified pressure vents on the payload fairing, which were required for the subsequent launch of the James Webb Space Telescope. It also debuted a location system using Galileo navigation satellites.[51]

On 25 December 2021, VA256 launched the James Webb Space Telescope towards a Sun–Earth L2 halo orbit.[52] The precision of trajectory following launch led to fuel savings credited with potentially doubling the lifetime of the telescope by leaving more hydrazine propellant on board for station-keeping than was expected.[52][53] According to Rudiger Albat, the program manager for Ariane 5, efforts had been made to select components for this flight that had performed especially well during pre-flight testing, including "one of the best Vulcain engines that we've ever built."[53]

GTO payload weight records

On 22 April 2011, the Ariane 5ECA flight VA-201 broke a commercial record, lifting Yahsat 1A and Intelsat New Dawn with a total payload weight of Template:Cvt to transfer orbit.[54] This record was later broken again during the launch of Ariane 5ECA flight VA-208 on 2 August 2012, lifting a total of Template:Cvt into the planned geosynchronous transfer orbit,[55] which was broken again 6 months later on flight VA-212 with Template:Cvt sent towards geosynchronous transfer orbit.[56] In June 2016, the GTO record was raised to Template:Cvt,[57] on the first rocket in history that carried a satellite dedicated to financial institutions.[58] The payload record was pushed a further Template:Cvt, up to Template:Cvt on 24 August 2016 with the launch of Intelsat 33e and Intelsat 36.[59] On 1 June 2017, the payload record was broken again to Template:Cvt carrying ViaSat-2 and Eutelsat-172B.[60] In 2021 VA-255 put 11,210 kg into GTO.

VA241 anomaly

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On 25 January 2018, an Ariane 5ECA launched SES-14 and Al Yah 3 satellites. About 9 minutes and 28 seconds after launch, a telemetry loss occurred between the launch vehicle and the ground controllers. It was later confirmed, about 1 hour and 20 minutes after launch, that both satellites were successfully separated from the upper stage and were in contact with their respective ground controllers,[61] but that their orbital inclinations were incorrect as the guidance systems might have been compromised. Therefore, both satellites conducted orbital procedures, extending commissioning time.[62] SES-14 needed about 8 weeks longer than planned commissioning time, meaning that entry into service was reported early September instead of July.[63] Nevertheless, SES-14 is still expected to be able to meet the designed lifetime. This satellite was originally to be launched with more propellant reserve on a Falcon 9 launch vehicle since the Falcon 9, in this specific case, was intended to deploy this satellite into a high inclination orbit that would require more work from the satellite to reach its final geostationary orbit.[64] The Al Yah 3 was also confirmed healthy after more than 12 hours without further statement, and like SES-14, Al Yah 3's maneuvering plan was also revised to still fulfill the original mission.[65] As of 16 February 2018, Al Yah 3 was approaching the intended geostationary orbit, after series of recovery maneuvers had been performed.[66] The investigation showed that invalid inertial units' azimuth value had sent the vehicle 17° off course but to the intended altitude, they had been programmed for the standard geostationary transfer orbit of 90° when the payloads were intended to be 70° for this supersynchronous transfer orbit mission, 20° off norme.[67] This mission anomaly ended the 82 consecutive launch success streak from 2003.[68]

Launch history

Launch statistics

Ariane 5 launch vehicles had accumulated 117 launches, 112 of which were successful, yielding a Script error: No such module "Percentage". success rate. Between April 2003 and December 2017, Ariane 5 flew 83 consecutive missions without failure, but the launch vehicle suffered a partial failure in January 2018.[69]

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Rocket configurations

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Launch outcomes

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List of launches

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See also

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Notes

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References

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  9. European Space Agency, "Ariane 5ECA": http://www.esa.int/Enabling_Support/Space_Transportation/Launch_vehicles/Ariane_5_ECA2 Discussed in context of other launch vehicles in Gérard Maral, Michel Bousquet, and Zhili Sun, Satellite Communications Systems: Systems, Techniques and Technology, sixth edition, London: Wiley, 2020 Template:ISBN
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External links

Template:Ariane Template:Arianespace launches Template:Expendable launch systems Template:European Space Agency Template:European launch systems