CERTIFICATE OF RE-ENTRYOrbital Register™ · by Orbital Radar™
Entry no.
1985-0352
COSMOS 1643
COSMOS 1643 (NORAD 15634) was deorbited in a controlled re-entry on 18 October 1985, after 6 months in orbit.
Controlled re-entryOfficial date
NORAD number
15634
International designator
1985-026A
Object type
Spacecraft
Country
USSR
Launched
25 Mar 1985Baikonur Cosmodrome
Re-entered (UTC)
18 Oct 1985UTC calendar day
Time in orbit
6 months207 days
How it ended
Deorbited (controlled re-entry)
Latitude range
64.7°N to 64.7°SFinal inclination 64.7°
Mass
3,390 kg
Operator
GUKOS
Built by
TsSKB
Bus
Yantar'-4KS1
Programme
Terilen
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 64.7°, allowed a re-entry anywhere between 64.7°N and 64.7°S.
Life in orbit
6 monthsCOSMOS 1643’s lowest and highest points above Earth, week by week, from its tracking history.
Also ended on 18 Oct 1985
2 entriesFrom the same launch
1985-026
Entered in the Orbital Register™, founding volume, September 2026.
Record version 1 · No corrections · orbitalradar.com/register/1985-0352
© 2026 Orbital Radar. Cite this entry by its number; the register itself may not be copied.
Record version 1 · No corrections · orbitalradar.com/register/1985-0352
© 2026 Orbital Radar. Cite this entry by its number; the register itself may not be copied.