CERTIFICATE OF RE-ENTRYOrbital Register™ · by Orbital Radar™
Entry no.
1999-0141
SL-6 R/B(2)
SL-6 R/B(2) (NORAD 11553) re-entered Earth’s atmosphere on 8 May 1999, after 20 years, 3 months in orbit.
Official date
NORAD number
11553
International designator
1979-004D
Object type
Rocket body
Country
USSR
Launched
18 Jan 1979Plesetsk Cosmodrome
Re-entered (UTC)
8 May 1999UTC calendar day
Time in orbit
20 years, 3 months7,415 days
How it ended
Re-entered (natural decay)
Latitude range
61.9°N to 61.9°SFinal inclination 61.9°
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 61.9°, allowed a re-entry anywhere between 61.9°N and 61.9°S.
Life in orbit
20 years, 3 monthsSL-6 R/B(2)’s lowest and highest points above Earth, week by week, from its tracking history.
Also ended on 8 May 1999
2 entriesFrom the same launch
1979-004
Entered in the Orbital Register™, founding volume, September 2026.
Record version 1 · No corrections · orbitalradar.com/register/1999-0141
© 2026 Orbital Radar. Cite this entry by its number; the register itself may not be copied.
Record version 1 · No corrections · orbitalradar.com/register/1999-0141
© 2026 Orbital Radar. Cite this entry by its number; the register itself may not be copied.