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{{Short description|CubeSat-based satellite}}
{{DISPLAYTITLE:TEMPO3}}
{{Infobox spacecraft class
| name = TEMPO3
| image = Tempo-3-0003.jpg
| image_size =
| image_alt =
| image_caption = Artist view of TEMPO3 in orbit.

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| applications = To demonstrate centripetal artificial gravity generation
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| spacecraft_type = Satellite
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The '''Tethered Experiment for Mars inter-Planetary Operations''' ('''TEMPO3''') is a proposed [[CubeSat]]-based
[[satellite]]<ref>{{cite web|url=http://cubesat.calpoly.edu/ |title=CubeSat in the News |website=Cubesat.calpoly.edu |date= |accessdate=2016-02-24}}</ref> meant to demonstrate [[Artificial gravity#Centripetal force|centripetal artificial gravity]] generation. After launch, the spacecraft will spin end over end to create gravity-like acceleration at both ends of a tether.<ref>http://members.marssociety.org/TMQ/TMQ-V1-I1.pdf {{Webarchive|url=https://web.archive.org/web/20170421044642/http://members.marssociety.org/TMQ/TMQ-V1-I1.pdf |date=2017-04-21 }} pg15-Tom Hill</ref> The project is being run by the [[Mars Society]]. It aims building from high-altitude tests to eventual orbital flight. Status is unknown since 2012.

==Background==
In the [[Mars Direct]] architecture for a humans-to-Mars mission, the crew on their way to [[Mars]] uses their discarded upper stage as a counterweight to spin end over end. This action generates gravity for the crew and prevents them from having to spend the six-month trip in zero-gravity conditions. [[Gemini 11]] and [[Gemini 12|12]] showed that the concept was viable,<ref>{{cite web |url=http://www.astronautix.com/flights/gemini11.htm |title=Gemini 11 |website=Astronautix.com |accessdate=2016-02-24 |url-status=dead |archiveurl=https://web.archive.org/web/20131108102326/http://www.astronautix.com/flights/gemini11.htm |archivedate=2013-11-08 }}</ref> but no gravity-related work has taken place since then using tethers.

TEMPO3 was selected as the winner of the [[Mars Project Challenge]], run by the [[Mars Society]] in 2008, to determine the group's next major project.<ref>K.C. Jones, "[http://www.informationweek.com/news/hardware/supercomputers/210101779 'TEMPO 3' Artificial Gravity Satellite On Mars Society's To-Do List]," ''InformationWeek,'' August 19, 2008</ref>

==Mission concept==
The spacecraft will launch with other [[CubeSat]] satellites. After separating from its carrier, TEMPO3 will spin up and then split into two parts connected by a tether. Separating will slow the spin rate, but will increase the acceleration measured at the ends. Accelerometers on board the spacecraft will sense the amount of gravity being demonstrated and will beam that data to Earth.<ref>Tom Hill and Alex Kirk, "[http://thespacereview.com/article/1194/1 TEMPO3: the Mars Society’s newest project]," ''The Space Review,'' August 25, 2008</ref>

==See also==
* [[Tether satellite]]
* [[CubeSat]]

==References==
{{Reflist}}

[[Category:Mars Society]]
[[Category:Proposed satellites]]
[[Category:CubeSats]]

TEMPO3 - Revision history

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