CERTIFICATE OF RE-ENTRYOrbital Register™ · by Orbital Radar™
Entry no.
2025-1849
COSMOS 1733
COSMOS 1733 (NORAD 16611) re-entered Earth’s atmosphere on 10 December 2025 over the North Pacific Ocean, after 39 years, 9 months in orbit.
Official date
NORAD number
16611
International designator
1986-018A
Object type
Spacecraft
Country
USSR
Launched
19 Feb 1986Plesetsk Cosmodrome
Re-entered (UTC)
10 Dec 2025Recorded time 03:10 UTC
Time in orbit
39 years, 9 months14,539 days
How it ended
Re-entered (natural decay)
Latitude range
82.4°N to 82.4°SFinal inclination 82.4°
Mass
1,750 kg
Operator
GRU
Built by
Southern SDB
Bus
Tselina-D
Programme
Tselina-D
Where it came down
Recorded positionRecorded position 13.0°N, 145.0°W at 03:10 UTC. Its final orbit, inclined at 82.4°, allowed a re-entry anywhere between 82.4°N and 82.4°S.
Life in orbit
39 years, 9 monthsCOSMOS 1733’s lowest and highest points above Earth, week by week, from its tracking history.
Also ended on 10 Dec 2025
4 entries
Entered in the Orbital Register™, founding volume, September 2026.
Record version 1 · No corrections · orbitalradar.com/register/2025-1849
© 2026 Orbital Radar. Cite this entry by its number; the register itself may not be copied.
Record version 1 · No corrections · orbitalradar.com/register/2025-1849
© 2026 Orbital Radar. Cite this entry by its number; the register itself may not be copied.