CERTIFICATE OF RE-ENTRYOrbital Register™ · by Orbital Radar™
Entry no.
1986-0404
SL-6 R/B(2)
SL-6 R/B(2) (NORAD 8529) re-entered Earth’s atmosphere on 13 October 1986, after 10 years, 9 months in orbit.
Official date
NORAD number
8529
International designator
1975-121D
Object type
Rocket body
Country
USSR
Launched
17 Dec 1975Plesetsk Cosmodrome
Re-entered (UTC)
13 Oct 1986UTC calendar day
Time in orbit
10 years, 9 months3,953 days
How it ended
Re-entered (natural decay)
Latitude range
—
Mass
4,500 kg
Where it came down
Not on recordNo position was recorded for this re-entry. Its final orbit is not on record.
Life in orbit
10 years, 9 monthsSL-6 R/B(2)’s lowest and highest points above Earth, week by week, from its tracking history.
Also ended on 13 Oct 1986
2 entriesFrom the same launch
1975-121
Entered in the Orbital Register™, founding volume, September 2026.
Record version 1 · No corrections · orbitalradar.com/register/1986-0404
© 2026 Orbital Radar. Cite this entry by its number; the register itself may not be copied.
Record version 1 · No corrections · orbitalradar.com/register/1986-0404
© 2026 Orbital Radar. Cite this entry by its number; the register itself may not be copied.