CERTIFICATE OF RE-ENTRYOrbital Register™ · by Orbital Radar™
Entry no.
1979-0431
SL-4 R/B
SL-4 R/B (NORAD 11521) re-entered Earth’s atmosphere on 10 September 1979, after 5 days in orbit.
Official date
NORAD number
11521
International designator
1979-080B
Object type
Rocket body
Country
USSR
Launched
5 Sep 1979Plesetsk Cosmodrome
Re-entered (UTC)
10 Sep 1979UTC calendar day
Time in orbit
5 days5 days
How it ended
Re-entered (natural decay)
Latitude range
81.3°N to 81.3°SFinal inclination 81.3°
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 81.3°, allowed a re-entry anywhere between 81.3°N and 81.3°S.
Life in orbit
5 daysAlso ended on 10 Sep 1979
2 entriesFrom the same launch
1979-080
Entered in the Orbital Register™, founding volume, September 2026.
Record version 1 · No corrections · orbitalradar.com/register/1979-0431
© 2026 Orbital Radar. Cite this entry by its number; the register itself may not be copied.
Record version 1 · No corrections · orbitalradar.com/register/1979-0431
© 2026 Orbital Radar. Cite this entry by its number; the register itself may not be copied.