Viking Lander Location and Spin Axis of Mars: Determination from Radio Tracking Data

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Science  27 Aug 1976:
Vol. 193, Issue 4255, pp. 803
DOI: 10.1126/science.193.4255.803


Radio tracking data from the Viking lander have been used to determine the lander position and the orientation of the spin axis of Mars. The areocentric coordinates of the lander are 22.27°N, 48.00°W, and 3389.5 kilometers from the center of mass; the spin axis orientation, referred to Earth's mean equator and equinox of 1950.0, is 317.35° right ascension and 52.71° declination.