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Titan Saturn System Mission
Titan Saturn System Mission (TSSM) was a joint NASA–ESA proposal for an exploration of Saturn and its moons Titan and Enceladus,〔 where many complex phenomena were revealed by ''Cassini''. With an estimated NASA cost of $2.5 billion (FY07), TSSM was proposed to launch in 2020, get gravity assists from Earth and Venus, and arrive at the Saturn system in 2029. The 4-year prime mission would include a two-year Saturn tour, a 2-month Titan aero-sampling phase, and a 20-month Titan orbit phase.
In 2009, a mission to Jupiter and its moons was given priority over ''Titan Saturn System Mission'', although TSSM will continue to be studied for a later launch date.
==Origin and status==
The Titan Saturn System Mission (TSSM) was officially created in January 2009 by the merging of the ESA's Titan and Enceladus Mission (TandEM) with NASA's Titan Explorer (2007) study, although plans to combine both concepts date at least back to early 2008. TSSM was competing against the Europa Jupiter System Mission (EJSM) proposal for funding since then; however in February 2009 it was announced that NASA/ESA had given EJSM priority ahead of TSSM,〔(NASA and ESA Prioritize Outer Planet Missions )〕〔(Jupiter in space agencies' sights )〕 although TSSM will continue to be studied for a later launch date, probably sometime in the 2020s. Detailed assessment reports of the mission elements as well as a specific concept for a lake-landing module for Titan's lakes called Titan Mare Explorer (TiME) with the potential of becoming a part of the TSSM have been proposed in February and October 2009, respectively.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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