CERTIFICATE OF RE-ENTRYOrbital Register™ · by Orbital Radar™
Entry no.
1981-0325
SL-4 R/B
SL-4 R/B (NORAD 12521) re-entered Earth’s atmosphere on 28 June 1981, after 11 days in orbit.
Official date
NORAD number
12521
International designator
1981-056B
Object type
Rocket body
Country
USSR
Launched
17 Jun 1981Baikonur Cosmodrome
Re-entered (UTC)
28 Jun 1981UTC calendar day
Time in orbit
11 days11 days
How it ended
Re-entered (natural decay)
Latitude range
70.4°N to 70.4°SFinal inclination 70.4°
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 70.4°, allowed a re-entry anywhere between 70.4°N and 70.4°S.
Life in orbit
11 daysAlso ended on 28 Jun 1981
3 entriesFrom the same launch
1981-056
Entered in the Orbital Register™, founding volume, September 2026.
Record version 1 · No corrections · orbitalradar.com/register/1981-0325
© 2026 Orbital Radar. Cite this entry by its number; the register itself may not be copied.
Record version 1 · No corrections · orbitalradar.com/register/1981-0325
© 2026 Orbital Radar. Cite this entry by its number; the register itself may not be copied.