CERTIFICATE OF RE-ENTRYOrbital Register™ · by Orbital Radar™
Entry no.
1990-0527
COSMOS 1631
COSMOS 1631 (NORAD 15584) re-entered Earth’s atmosphere on 8 December 1990, after 5 years, 9 months in orbit.
Official date
NORAD number
15584
International designator
1985-018A
Object type
Spacecraft
Country
USSR
Launched
27 Feb 1985Plesetsk Cosmodrome
Re-entered (UTC)
8 Dec 1990UTC calendar day
Time in orbit
5 years, 9 months2,110 days
How it ended
Re-entered (natural decay)
Latitude range
65.8°N to 65.8°SFinal inclination 65.8°
Mass
570 kg
Operator
PVO
Built by
Southern SDB
Bus
Vektor
Programme
Vektor1
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
5 years, 9 monthsCOSMOS 1631’s lowest and highest points above Earth, week by week, from its tracking history.
Also ended on 8 Dec 1990
3 entriesFrom the same launch
1985-018
Entered in the Orbital Register™, founding volume, September 2026.
Record version 1 · No corrections · orbitalradar.com/register/1990-0527
© 2026 Orbital Radar. Cite this entry by its number; the register itself may not be copied.
Record version 1 · No corrections · orbitalradar.com/register/1990-0527
© 2026 Orbital Radar. Cite this entry by its number; the register itself may not be copied.