CERTIFICATE OF RE-ENTRYOrbital Register™ · by Orbital Radar™
Entry no.
1981-0479
SL-4 R/B
SL-4 R/B (NORAD 12831) re-entered Earth’s atmosphere on 23 September 1981, after 8 days in orbit.
Official date
NORAD number
12831
International designator
1981-090B
Object type
Rocket body
Country
USSR
Launched
15 Sep 1981Plesetsk Cosmodrome
Re-entered (UTC)
23 Sep 1981UTC calendar day
Time in orbit
8 days8 days
How it ended
Re-entered (natural decay)
Latitude range
72.9°N to 72.9°SFinal inclination 72.9°
Mass
2,350 kg
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 72.9°, allowed a re-entry anywhere between 72.9°N and 72.9°S.
Life in orbit
8 daysAlso ended on 23 Sep 1981
1 entryFrom the same launch
1981-090
Entered in the Orbital Register™, founding volume, September 2026.
Record version 1 · No corrections · orbitalradar.com/register/1981-0479
© 2026 Orbital Radar. Cite this entry by its number; the register itself may not be copied.
Record version 1 · No corrections · orbitalradar.com/register/1981-0479
© 2026 Orbital Radar. Cite this entry by its number; the register itself may not be copied.