Michael W H, Tolson R H, Mayo A P, Blackshear W T, Kelly G M, Cain D L, Brenkle J P, Shapiro I I, Reasenberg R D
Science. 1976 Aug 27;193(4255):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 degrees N, 48.00 degrees 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 degrees right ascension and 52.71 degrees declination.
来自海盗号着陆器的无线电跟踪数据已被用于确定着陆器的位置以及火星自转轴的方向。着陆器的以火星质心为中心的坐标为北纬22.27度、西经48.00度，距离火星质心3389.5千米；自转轴方向，相对于1950.0年地球平均赤道和分点，赤经为317.35度，赤纬为52.71度。
