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Kosmos 391 (Russian: Космос 391 meaning Cosmos 391), also known as DS-P1-I No.11 was a satellite which was used as a radar target for anti-ballistic missile tests. It was launched by the Soviet Union in 1971 as part of the Dnepropetrovsk Sputnik programme.^[1]

Launch

It was launched aboard a Kosmos-2I 63SM rocket,^[2] from Site 133/1 at Plesetsk. The launch occurred at 12:00:00 UTC on 14 January 1971.^[3]

Kosmos 391 was placed into a low Earth orbit with a perigee of 267 kilometres (166 mi), an apogee of 803 kilometres (499 mi), 70.9 degrees of inclination, and an orbital period of 95.3 minutes.^[1] It decayed from orbit on 21 February 1971.^[4]

Kosmos 391 was the tenth of nineteen DS-P1-I satellites to be launched.^[1] Of these, all reached orbit successfully except the seventh.^[5]

^ ^a ^b ^c Wade, Mark. "DS-P1-I". Encyclopedia Astronautica. Archived from the original on 30 November 2009. Retrieved 28 May 2009.
^ McDowell, Jonathan. "Launch Log". Jonathan's Space Page. Retrieved 28 May 2009.
^ Wade, Mark. "Kosmos 2". Encyclopedia Astronautica. Archived from the original on 18 June 2012. Retrieved 28 May 2009.
^ McDowell, Jonathan. "Satellite Catalog". Jonathan's Space Page. Retrieved 28 May 2009.
^ Wade, Mark. "DS". Encyclopedia Astronautica. Archived from the original on 31 March 2009. Retrieved 28 May 2009.