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Viking Lander 1 and Viking Lander 2 Yes, but there are more than that.
The Viking 1 and Viking 2 missions consisted of both an orbiter and a lander. The lander landed on the surface of Mars to collect data and images.
Lander
lander
It was Mars 2, from the Soviet Mars Lander Program.
R. B. Tucker has written: 'Viking Lander imaging investigation'
None, since satellites don't "land", they orbit. There are 6 landers and rovers on the Martian surface, 2 of which were lost at arrival. NASA reports 3 types of Martian Exploration missions: (1) Fly-by missions: Mariner 3, Mariner 4, Mariner 6, Mariner 7 (2) Orbiter missions (the satellites): Mariner 8, Mariner 9, Viking 1, Viking 2, Mars Observer, Mars Global Surveyor, Mars Climate Orbiter, 2001 Mars Odyssey, Mars Express, Mars Reconnaissance Orbiter (3) Lander and Rover missions: Viking 1 Lander, Viking 2 Lander, Pathfinder Rover, Polar Lander (lost), Deep Space 2 (lost), Spirit Rover, Opportunity Rover, Phoenix Mars Science Laboratory Rover is scheduled to launch in 2011.
Space probes voyager 1 and Voyager 2 were launched in 1977
Viking 1 was launched on August 20, 1975, and the second craft, Viking 2, was launched on September 9, 1975. Viking 1 entered Mars orbit on June 19, 1976. The Viking 1 touched down on the surface of Mars on July 20, 1976, and was joined by the Viking 2 on September 3.
The two VIKING probes arrived in Mars orbit in 1976 when they started sending photographs back to Earth. The two orbiters continued sending photographs and the landers conducted experiments on the planet's surface until they failed as follows:Viking 2 Orbiter: July 1978 Viking 2 Lander: April 1980 Viking 1 Orbiter: August 1980 Viking 1 Lander: November 1982.
Viking 1 and Viking 2 landed on Mars in 1976 and Mars Pathfinder (and the Mars rover Sojourner) landed on Mars in 1997 and are still up there moving and functioning today.
Viking Cruises is the world's most award winning river cruise line. The best site for one to find further information on Viking Cruises is the official Viking Cruises website.