CERTIFICATE OF RE-ENTRYOrbital Register™ · by Orbital Radar™
Entry no.
1990-0309
SL-6 R/B(2)
SL-6 R/B(2) (NORAD 11551) re-entered Earth’s atmosphere on 30 June 1990, after 11 years, 2 months in orbit.
Official date
NORAD number
11551
International designator
1979-031D
Object type
Rocket body
Country
USSR
Launched
12 Apr 1979Plesetsk Cosmodrome
Re-entered (UTC)
30 Jun 1990UTC calendar day
Time in orbit
11 years, 2 months4,097 days
How it ended
Re-entered (natural decay)
Latitude range
63.9°N to 63.9°SFinal inclination 63.9°
Mass
4,500 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 63.9°, allowed a re-entry anywhere between 63.9°N and 63.9°S.
Life in orbit
11 years, 2 monthsSL-6 R/B(2)’s lowest and highest points above Earth, week by week, from its tracking history.
From the same launch
1979-031
Entered in the Orbital Register™, founding volume, September 2026.
Record version 1 · No corrections · orbitalradar.com/register/1990-0309
© 2026 Orbital Radar. Cite this entry by its number; the register itself may not be copied.
Record version 1 · No corrections · orbitalradar.com/register/1990-0309
© 2026 Orbital Radar. Cite this entry by its number; the register itself may not be copied.