Mission type | ABM radar target |
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COSPAR ID | 1969-033A ![]() |
SATCAT no. | 03855![]() |
Spacecraft properties | |
Spacecraft type | DS-P1-Yu |
Manufacturer | Yuzhnoye |
Launch mass | 325 kilograms (717 lb) |
Start of mission | |
Launch date | 4 April 1969, 13:00:04 (1969-04-04UTC13:00:04Z) UTC |
Rocket | Kosmos-2I 63SM |
Launch site | Plesetsk 133/1 |
End of mission | |
Decay date | 6 July 1969 (1969-07-07) |
Orbital parameters | |
Reference system | Geocentric |
Regime | Low Earth |
Perigee altitude | 256 kilometres (159 mi) |
Apogee altitude | 412 kilometres (256 mi) |
Inclination | 70.9 degrees |
Period | 91.2 minutes |
Kosmos 277 (Russian: Космос 277 meaning Cosmos 277), known before launch as DS-P1-Yu No.20, was a Soviet satellite which was used as a radar calibration target for tests of anti-ballistic missiles. It was a 325-kilogram (717 lb) spacecraft, which was built by the Yuzhnoye Design Bureau, and launched in 1969 as part of the Dnepropetrovsk Sputnik programme.[1]
Kosmos 277 was launched from Site 133/1 at the Plesetsk Cosmodrome,[2] atop a Kosmos-2I 63SM carrier rocket. The launch occurred on 4 April 1969 at 13:00:04 UTC, and resulted in Kosmos 277's successful deployment into low Earth orbit.[3] Upon reaching orbit, it was assigned its Kosmos designation, and received the International Designator 1969-033A.
Kosmos 277 was operated in an orbit with a perigee of 256 kilometres (159 mi), an apogee of 412 kilometres (256 mi), 70.9 degrees of inclination, and an orbital period of 91.2 minutes.[1][4] It remained in orbit until it decayed and reentered the atmosphere on 6 July 1969.[4] It was the twentieth of seventy nine DS-P1-Yu satellites to be launched,[1] and the nineteenth of seventy two to successfully reach orbit.[5]
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Payloads are separated by bullets ( · ), launches by pipes ( | ). Crewed flights are indicated in underline. Uncatalogued launch failures are listed in italics. Payloads deployed from other spacecraft are denoted in (brackets). |
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