Mariner 9

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Mariner 9 was a NASA spacecraft that became the first artificial object to orbit another planet when it arrived on Mars on 1971-Nov-14, narrowly beating the two Soviet probes (Mars 2 and Mars 3) by two weeks. It remained active until 1972-Oct-27, and is predicted to have deorbited by 2022 at the earliest

Mariner Program
(1962-1975)
Mission Start End
Mariner 8 1971-May-9
Spacecraft lost after stage separation failure of its Centaur-D upper stage
Mariner 9 1971-May-301972-Oct-27
First spacecraft to orbit another planet (1,394 x 17,144 km)

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