CERTIFICATE OF RE-ENTRYOrbital Register™ · by Orbital Radar™
Entry no.
1971-0123
SL-4 R/B
SL-4 R/B (NORAD 5231) re-entered Earth’s atmosphere on 21 May 1971, after 3 days in orbit.
Official date
NORAD number
5231
International designator
1971-043B
Object type
Rocket body
Country
USSR
Launched
18 May 1971Baikonur Cosmodrome
Re-entered (UTC)
21 May 1971UTC calendar day
Time in orbit
3 days3 days
How it ended
Re-entered (natural decay)
Latitude range
51.8°N to 51.8°SFinal inclination 51.8°
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 51.8°, allowed a re-entry anywhere between 51.8°N and 51.8°S.
Life in orbit
3 daysAlso ended on 21 May 1971
2 entriesFrom the same launch
1971-043
Entered in the Orbital Register™, founding volume, September 2026.
Record version 1 · No corrections · orbitalradar.com/register/1971-0123
© 2026 Orbital Radar. Cite this entry by its number; the register itself may not be copied.
Record version 1 · No corrections · orbitalradar.com/register/1971-0123
© 2026 Orbital Radar. Cite this entry by its number; the register itself may not be copied.