|Launch mass||350 kilograms (770 lb)|
|Start of mission|
|Launch date||9 December 1964, 23:02UTC|
|Launch site||Kapustin Yar 86/1|
|End of mission|
|Decay date||14 November 1965|
|Perigee||258 kilometres (160 mi)|
|Apogee||537 kilometres (334 mi)|
Kosmos 51 (Russian: Космос 51 meaning Cosmos 51), also known as DS-MT No.3 was a technology demonstration satellite which was launched by the Soviet Union in 1964 as part of the Dnepropetrovsk Sputnik programme. Its primary mission was to demonstrate an electric gyrodyne orientation system. It also carried a scientific research package as a secondary payload, which was used to study cosmic rays and the luminosity of space.
Kosmos 51 was placed into a low Earth orbit with a perigee of 258 kilometres (160 mi), an apogee of 537 kilometres (334 mi), 48.8 degrees of inclination, and an orbital period of 92.6 minutes. It decayed from orbit on 14 November 1965. Kosmos 51 was the last of three DS-MT satellites to be launched. The first was lost in a launch failure in June 1963, and the second was launched as Kosmos 31 in June 1964.
- Wade, Mark. "DS-MT". Encyclopedia Astronautica. Retrieved 26 May 2009.
- McDowell, Jonathan. "Launch Log". Jonathan's Space Page. Retrieved 26 May 2009.
- Wade, Mark. "Kosmos 2". Encyclopedia Astronautica. Retrieved 26 May 2009.
- McDowell, Jonathan. "Satellite Catalog". Jonathan's Space Page. Retrieved 26 May 2009.
- Wade, Mark. "DS". Encyclopedia Astronautica. Retrieved 26 May 2009.
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