The Viking 1 Lander touched down in western Chryse Planitia ( " Golden Plain " ) at at a reference altitude of " 2.69 km relative to a reference ellipsoid with an equatorial radius of 3397.2 km and a flatness of 0.0105 ( 22.480?N, 47.967?W planetographic ) at 11 : 53 : 06 UT ( 16 : 13 local Mars time ).
