United States Air ForceDelta II 7425-9.5Space Launch Complex 17B, Cape Canaveral SFS, FL, USA
Delta 7425-9.5 | Mars Polar Lander
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No countdown — this launch time is not yet known to the minute.January 3, 1999Add to calendar
Image: NASA
United States Air Force's 1,004th launch · 1st this year · humanity's 4,290th orbital launch attempt
The launch vehicle successfully inserted its payload(s) into the target orbit(s).
Window: Jan 3, 20:21 – Jan 3, 20:21 UTC
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Mars Polar Lander
The Mars Polar Lander, also known as the Mars Surveyor '98 Lander, was a 290-kilogram robotic spacecraft lander launched by NASA on January 3, 1999 to study the soil and climate of Planum Australe, a region near the south pole on Mars. It formed part of the Mars Surveyor '98 mission. On December 3, 1999, however, after the descent phase was expected to be complete, the lander failed to reestablish communication with Earth. A post-mortem analysis determined the most likely cause of the mishap was premature termination of the engine firing prior to the lander touching the surface, causing it to strike the planet at a high velocity.
Robotic Exploration · Heliocentric N/A (Helio-N/A)
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