View source for PROBA

{{Short description|European Space Agency satellites from 2001}}
{{Infobox spaceflight
| name               = PROBA-1
| names_list         = PROBA, PROBA-1
| image              = 
| image_caption      = 
| mission_type       = Experimental, [[Earth Observation]]
| operator           = [[ESA]]
| website            = {{URL|https://www.esa.int/Applications/Observing_the_Earth/Proba-1|Proba-1 applications}}
| COSPAR_ID          = 2001-049B
| SATCAT             = 26958
| mission_duration   = Elapsed: {{time interval|22 October 2001 04:53|show=ymd|sep=,}}
| spacecraft_bus     = PROBA
| manufacturer       = [[QinetiQ|QinetiQ Space]] (previously Verhaert Space)
| dry_mass           = {{cvt|94|kg|lb}}
| launch_mass        = {{cvt|94|kg|lb}}
| dimensions         = {{cvt|0.6|x|0.6|x|0.8|m}}
| power              = 90{{nbsp}}W
| launch_date        = {{start date|2001|10|22|04|53|df=yes||Z}}
| launch_rocket      = [[Polar Satellite Launch Vehicle|PSLV]] C3
| launch_site        = [[Satish Dhawan Space Centre|Sriharikota]] [[Satish Dhawan Space Centre First Launch Pad|FLP]]
| launch_contractor  = [[ISRO]]
| disposal_type      = 
| deactivated        = 
| last_contact       = <!-- {{end-date|[insert date here]}} -->
| decay_date         = 
| orbit_epoch        = 22 October 2001 00:53:00&nbsp;UTC
| orbit_reference    = [[geocentric orbit|Geocentric]]
| orbit_regime       = [[sun-synchronous orbit|Sun-synchronous]]
| orbit_periapsis    = {{cvt|553|km|mi}}
| orbit_apoapsis     = {{cvt|677|km|mi}}
| orbit_inclination  = 97.9&nbsp;degrees
| orbit_eccentricity = 0.008866
| orbit_period       = 97&nbsp;minutes
| apsis              = gee
}}
'''PROBA''' ('''Project for On-Board Autonomy'''), renamed '''PROBA-1''', is a Belgian [[satellite]] technology demonstration mission launched atop an Indian [[Polar Satellite Launch Vehicle]] by [[ISRO]] on 22 October 2001.<ref>{{cite journal |last1=Ramakrishnan |first1=S. |last2=Somanath |first2=S. |last3=Balakrishnan |first3=S. S. |date=January 2002 |title=Multi-Orbit Mission by PSLV-C3 and Future Launch Opportunities |journal=IAF Abstracts |pages=936 |bibcode=2002iaf..confE.936R}}</ref><ref name="C3">{{cite web |url=http://www.isro.org/pslv-c3/pslv-c3.aspx |title=PSLV-C3 |publisher=[[ISRO]] |date=22 October 2001 |archive-url=https://web.archive.org/web/20140325082903/http://www.isro.org/pslv-c3/pslv-c3.aspx |archive-date=25 March 2014 |access-date=25 October 2021 |url-status=dead}}</ref> The satellite was funded through the [[European Space Agency|ESA]]'s [[Miniaturized satellite|MicroSat]] and General Study Program with the objective of addressing issues regarding on-board operational autonomy of a generic satellite platform.<ref name="ESAPROBA1">{{cite web |url=https://www.esa.int/Applications/Observing_the_Earth/Proba-1/Overview |title=PROBA-1 - Overview |publisher=[[ESA]] |date=11 December 2012 |access-date=25 October 2021}}</ref><ref>{{Cite web |title=PROBA-1 (Project for On-Board Autonomy - 1) |url=https://www.eoportal.org/satellite-missions/proba-1#proba-1-project-for-on-board-autonomy---1 |access-date=2022-12-28 |website=www.eoportal.org}}</ref> This small (60×60×80&nbsp;cm; 95&nbsp;kg) boxlike system, with [[Photovoltaic module|solar panel]] collectors on its surface, hosts two Earth Observation instruments dubbed CHRIS and HRC. CHRIS is a [[hyperspectral]] system (200 narrow bands) that images at 17 m resolution, while HRC is a monochromatic camera that images [[visible light]] at 5 m resolution.<ref name="esa-20211022" />

With an initial lifetime of one to two years, the satellite celebrated its 20th year of operations in 2021.<ref name="esa-20211022">{{cite web |url=https://www.esa.int/Enabling_Support/Space_Engineering_Technology/Shaping_the_Future/Proba-1_Celebrates_20th_Birthday_In_Orbit |title=Proba-1 Celebrates 20th Birthday In Orbit |publisher=[[ESA]] |date=22 October 2021 |access-date=25 October 2021}}</ref> On 9 March 2018, it surpassed [[ERS-2]] as ESA's longest operated [[Earth observation]] mission of all time.<ref name="ESAnewRecord">{{cite web |url=https://www.esa.int/Applications/Observing_the_Earth/Proba-1/Proba-1_sets_new_record |title=Proba-1 sets new record |publisher=[[ESA]] |date=8 March 2018 |access-date=11 March 2018}}</ref> ESA aims to deorbit the satellite through the [[ClearSpace-1]] mission in 2026.<ref name="sn-20240424">{{cite web |last=Werner |first=Debra |url=https://spacenews.com/major-changes-approved-for-clearspace-1-mission/ |title=Major changes approved for ClearSpace-1 mission |work=[[SpaceNews]] |date=24 April 2024 |access-date=24 April 2024}}</ref>

== Series of satellites ==
'''PROBA''' is also the name of the series of satellites starting with PROBA-1. The name is also used to refer to the bus of the satellites.

The second satellite in the PROBA series, [[PROBA-2]], was launched on 2 November 2009 together with the [[Soil Moisture and Ocean Salinity satellite|SMOS]] satellite.

The third satellite to be launched was [[PROBA-V]] (PROBA-Vegetation), on 7 May 2013.

The fourth satelite in the program is the formation flying demonstration mission [[PROBA-3]] launched on 5 December 2024.<ref>{{Cite web |title=Eclipse-making double satellite Proba-3 enters orbit |url=https://www.esa.int/Enabling_Support/Space_Engineering_Technology/Proba-3/Eclipse-making_double_satellite_Proba-3_enters_orbit#:~:text=A%20pair%20of%20spacecraft%20were,were%20one%20single%20giant%20spacecraft |access-date=2025-02-19 |website=www.esa.int |language=en}}</ref>

Further planned satellites in the PROBA series include the limb sounder [[ALTIUS]].

== See also ==
{{Portal|Spaceflight}}
*[[Miniaturized satellite]]

== References ==
<references />

==External links==
* http://earth.esa.int/proba/ {{Webarchive|url=https://web.archive.org/web/20120109232747/http://earth.esa.int/proba/ |date=2012-01-09 }}
* [https://www.eoportal.org/satellite-missions/proba-1 PROBA-1 article on eoPortal by ESA]
* [https://www.eoportal.org/satellite-missions/proba-2 PROBA-2 article on eoPortal by ESA]
* [https://www.eoportal.org/satellite-missions/proba-3 PROBA-3 article on eoPortal by ESA]
* [https://www.eoportal.org/satellite-missions/proba-v PROBA-V article on eoPortal by ESA]
* [https://www.eoportal.org/satellite-missions/proba-v-plus-one PROBA-V plus one article on eoPortal by ESA]

{{European Space Agency}}
{{Orbital launches in 2001}}

{{DEFAULTSORT:Proba}}
[[Category:Earth observation satellites of the European Space Agency]]
[[Category:European Space Agency]]
[[Category:Spacecraft launched in 2001]]
[[Category:Spacecraft launched by PSLV rockets]]
[[Category:Technology demonstrations]]


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