The Viking project consisted of two separate spacecraft assemblies to Mars, Viking 1, launched on 20 August 1975, and Viking 2, launched on 9 September 1975. Each spacecraft consisted of an orbiter and a lander. The Viking 1 lander was located on the western slope of Chryse Planitia at 22° latitude and 48° longitude and Viking 2 landed in Utopia Planitia at 48° latitude and 226° longitude. Viking Lander 1 transmitted data until November 11, 1982. and Viking Lander 2 ceased transmission April 11, 1980.
Basic Mission Goals
To study the biology, chemical composition (organic and inorganic), meteorology, seismology, magnetic properties, appearance, and physical properties of the martian surface and atmosphere.
For more information concerning the mission see the following links:
The atmospheric data consisted of:
is housed in the Geosciences Node.