CERTIFICATE OF RE-ENTRYOrbital Register™ · by Orbital Radar™
Entry no.
1991-0300
SL-4 R/B
SL-4 R/B (NORAD 21612) re-entered Earth’s atmosphere on 25 July 1991, after 2 days in orbit.
Official date
NORAD number
21612
International designator
1991-052B
Object type
Rocket body
Country
USSR
Launched
23 Jul 1991Plesetsk Cosmodrome
Re-entered (UTC)
25 Jul 1991UTC calendar day
Time in orbit
2 days2 days
How it ended
Re-entered (natural decay)
Latitude range
82.3°N to 82.3°SFinal inclination 82.3°
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 82.3°, allowed a re-entry anywhere between 82.3°N and 82.3°S.
Life in orbit
2 daysAlso ended on 25 Jul 1991
2 entriesFrom the same launch
1991-052
Entered in the Orbital Register™, founding volume, September 2026.
Record version 1 · No corrections · orbitalradar.com/register/1991-0300
© 2026 Orbital Radar. Cite this entry by its number; the register itself may not be copied.
Record version 1 · No corrections · orbitalradar.com/register/1991-0300
© 2026 Orbital Radar. Cite this entry by its number; the register itself may not be copied.