CERTIFICATE OF RE-ENTRYOrbital Register™ · by Orbital Radar™
Entry no.
1977-0436
Kosmos-816 SS 20
ESO
Kosmos-816 SS 20 (NORAD 9511) re-entered Earth’s atmosphere on 12 October 1977, after 1 year, 5 months in orbit.
Official dateIdentified from the historical record
NORAD number
9511
International designator
1976-037X
Object type
Spacecraft
Official listing
COSMOS 816 DEBListed as a fragment
Country
USSR
Launched
28 Apr 1976Plesetsk Cosmodrome
Re-entered (UTC)
12 Oct 1977UTC calendar day
Time in orbit
1 year, 5 months532 days
How it ended
Re-entered (natural decay)
Latitude range
65.8°N to 65.8°SFinal inclination 65.8°
Mass
5 kg
Operator
PVO
Built by
Southern SDB
Bus
ESO
Programme
ESO
Where it came down
Latitude band its orbit allowedExact position not recorded
No position was recorded for this re-entry. Its final orbit, inclined at 65.8°, allowed a re-entry anywhere between 65.8°N and 65.8°S.
Life in orbit
1 year, 5 monthsKosmos-816 SS 20’s lowest and highest points above Earth, week by week, from its tracking history.
From the same launch
1976-037
Entered in the Orbital Register™, founding volume, September 2026.
Record version 1 · No corrections · orbitalradar.com/register/1977-0436
© 2026 Orbital Radar. Cite this entry by its number; the register itself may not be copied.
Record version 1 · No corrections · orbitalradar.com/register/1977-0436
© 2026 Orbital Radar. Cite this entry by its number; the register itself may not be copied.