|Launch mass||325 kilograms (717 lb)|
|Start of mission|
|Launch date||6 June 1964, 06:00UTC|
|Launch site||Kapustin Yar Mayak-2|
|End of mission|
|Decay date||20 October 1964|
|Perigee||221 kilometres (137 mi)|
|Apogee||485 kilometres (301 mi)|
Kosmos 31 (Russian: Космос 31 meaning Cosmos 31), also known as DS-MT No.2 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.
Kosmos 31 was placed into a low Earth orbit with a perigee of 221 kilometres (137 mi), an apogee of 485 kilometres (301 mi), 48.9 degrees of inclination, and an orbital period of 91.7 minutes. It decayed from orbit on 20 October 1964. Kosmos 31 was the second of three DS-MT satellites to be launched. The first was lost in a launch failure in June 1963, and the third was Kosmos 51, which was launched in December 1964.
- Wade, Mark. "DS-MT". Encyclopedia Astronautica. Archived from the original on 5 January 2009. Retrieved 26 May 2009.
- McDowell, Jonathan. "Launch Log". Jonathan's Space Page. Retrieved 26 May 2009.
- Wade, Mark. "Kosmos 2". Encyclopedia Astronautica. Archived from the original on 8 July 2012. Retrieved 26 May 2009.
- McDowell, Jonathan. "Satellite Catalog". Jonathan's Space Page. Retrieved 26 May 2009.
- Wade, Mark. "DS". Encyclopedia Astronautica. Archived from the original on 31 March 2009. Retrieved 26 May 2009.
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