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  2. Mars cycler - Wikipedia

    en.wikipedia.org/wiki/Mars_cycler

    Earth orbits the Sun in one Earth year, Mars in 1.881. Neither orbit is perfectly circular; Earth has an orbital eccentricity of 0.0168, and Mars of 0.0934. The two orbits are not quite coplanar either, as the orbit of Mars is inclined by 1.85 degrees to that of Earth. The effect of the gravity of Mars on the cycler orbits is almost negligible ...

  3. Cycler - Wikipedia

    en.wikipedia.org/wiki/Cycler

    A lunar cycler or Earth–Moon cycler is a cycler orbit, or spacecraft therein, which periodically passes close by the Earth and the Moon, using gravity assists and occasional propellant-powered corrections to maintain its trajectories between the two. If the fuel required to reach a particular cycler orbit from both the Earth and the Moon is ...

  4. List of Mars orbiters - Wikipedia

    en.wikipedia.org/wiki/List_of_Mars_orbiters

    Artist's rendition of Mars Express as seen by NASA's Mars Global Surveyor Image of Mars Express in orbit at Mars. 2001 Mars Odyssey was launched April 7, 2001 on a Delta II rocket and currently holds the record for the longest-surviving continually active spacecraft in orbit around a planet other than Earth at 23 years, 3 months and 17 days.

  5. Areosynchronous orbit - Wikipedia

    en.wikipedia.org/wiki/Areosynchronous_orbit

    [1] An areosynchronous orbit that is equatorial (in the same plane as the equator of Mars), circular, and prograde (rotating about Mars's axis in the same direction as the planet's surface) is known as an areostationary orbit (AEO). To an observer on the surface of Mars, the position of a satellite in AEO would appear to be fixed in a constant ...

  6. List of missions to Mars - Wikipedia

    en.wikipedia.org/wiki/List_of_missions_to_Mars

    Lost when the Mars 2 lander crashed into the surface of Mars. 16 Mars 3: Mars 3 (4M No.172) 28 May 1971 Soviet Union: Orbiter Successful On December 2 it became in short sequence the third spacecraft to orbit another planet. [5] Operated for 20 orbits [8] [9] Proton-K/D: Mars 3 lander (SA 4M No.172) Lander Partial success [10] [11]

  7. Areocentric orbit - Wikipedia

    en.wikipedia.org/wiki/Areocentric_orbit

    The first artificial satellite to orbit another planet — the U.S. probe Mariner 9 — entered areocentric orbit on 13 November 1971. [1] Within a month, Mariner 9 was joined in orbit by two Soviet orbiters: Mars 2 (27 November 1971) and Mars 3 (2 December 1971). [2]

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