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Note: The Soviets split the Mars 4 - 7 missions into four separate Proton launches instead of their customary twin launch due to mass limitations imposed by the unfavorable Earth-Mars geometry during the 1973 launch window. All four missions were doomed by flawed onboard computer chips but were launched anyway in attempt to beat the US to the surface of Mars. See also Mars '73: Learning from Mistakes by Ted Stryk.
Viking Test - USA 11 February 1974
Launch failure (Titan IIIE-Centaur). Counts as attempt or mission?
Note: As with the Luna list, after much thought, I decided I shall include in this population any future missions which take place in LEO but are solely dedicated to promoting Mars exploration. Space physics experiments of broad applicability (e.g. radiation measurement, magnetic mapping) are not included for the same reason. Multiple visits to the same body by the same spacecraft (e.g. GEM) do not count as multiple missions (even if they do require multiple visits to Capitol Hill for funding). Multiple visits to different primaries do. A mere gravity assist maneuver without science return doesn't really count as a mission, either - a "flyby" requires at least one instrument to be pointed in the general direction of the celestial body. This was not an accounting issue until a few Big Science missions (e.g. Galileo, Project Vega) flew some very complex trajectories with multiple gravity assists.
Credit goes out to TRW Space Log 1957-1996, The Planetary Report published by The Planetary Society, Proton Mission Planner's Manual, Jonathan's Space Report, and Chris Jones: clj@world.std.com. Many thanks to Marc Rayman at JPL for constructive criticism. A tip o' the dust visor to David Portree DSFPortree@aol.com for his sharp editorial eyes.
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These pages last updated November 13, 2005.