CERTIFICATE OF RE-ENTRYOrbital Register™ · by Orbital Radar™
Entry no.
1981-0045
SL-8 R/B
SL-8 R/B (NORAD 11633) re-entered Earth’s atmosphere on 31 January 1981, after 1 year, 1 month in orbit.
Official date
NORAD number
11633
International designator
1979-100B
Object type
Rocket body
Country
USSR
Launched
5 Dec 1979Plesetsk Cosmodrome
Re-entered (UTC)
31 Jan 1981UTC calendar day
Time in orbit
1 year, 1 month423 days
How it ended
Re-entered (natural decay)
Latitude range
65.8°N to 65.8°SFinal inclination 65.8°
Mass
1,434 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 65.8°, allowed a re-entry anywhere between 65.8°N and 65.8°S.
Life in orbit
1 year, 1 monthSL-8 R/B’s lowest and highest points above Earth, week by week, from its tracking history.
Also ended on 31 Jan 1981
2 entriesFrom the same launch
1979-100
Entered in the Orbital Register™, founding volume, September 2026.
Record version 1 · No corrections · orbitalradar.com/register/1981-0045
© 2026 Orbital Radar. Cite this entry by its number; the register itself may not be copied.
Record version 1 · No corrections · orbitalradar.com/register/1981-0045
© 2026 Orbital Radar. Cite this entry by its number; the register itself may not be copied.