CERTIFICATE OF RE-ENTRYOrbital Register™ · by Orbital Radar™
Entry no.
1990-0101
Kosmos-1985 SS 36
ESO
Kosmos-1985 SS 36 (NORAD 20431) re-entered Earth’s atmosphere on 18 February 1990, after 1 year, 1 month in orbit.
Official dateIdentified from the historical record
NORAD number
20431
International designator
1988-113AP
Object type
Spacecraft
Official listing
COSMOS 1985 DEBListed as a fragment
Country
USSR
Launched
23 Dec 1988Plesetsk Cosmodrome
Re-entered (UTC)
18 Feb 1990UTC calendar day
Time in orbit
1 year, 1 month422 days
How it ended
Re-entered (natural decay)
Latitude range
73.5°N to 73.5°SFinal inclination 73.5°
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 73.5°, allowed a re-entry anywhere between 73.5°N and 73.5°S.
Life in orbit
1 year, 1 monthKosmos-1985 SS 36’s lowest and highest points above Earth, week by week, from its tracking history.
From the same launch
1988-113
Entered in the Orbital Register™, founding volume, September 2026.
Record version 1 · No corrections · orbitalradar.com/register/1990-0101
© 2026 Orbital Radar. Cite this entry by its number; the register itself may not be copied.
Record version 1 · No corrections · orbitalradar.com/register/1990-0101
© 2026 Orbital Radar. Cite this entry by its number; the register itself may not be copied.