CERTIFICATE OF RE-ENTRYOrbital Register™ · by Orbital Radar™
Entry no.
1999-0207
SL-6 R/B(2)
SL-6 R/B(2) (NORAD 16686) re-entered Earth’s atmosphere on 28 June 1999, after 13 years, 2 months in orbit.
Official date
NORAD number
16686
International designator
1986-031D
Object type
Rocket body
Country
USSR
Launched
18 Apr 1986Plesetsk Cosmodrome
Re-entered (UTC)
28 Jun 1999UTC calendar day
Time in orbit
13 years, 2 months4,819 days
How it ended
Re-entered (natural decay)
Latitude range
61.7°N to 61.7°SFinal inclination 61.7°
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 61.7°, allowed a re-entry anywhere between 61.7°N and 61.7°S.
Life in orbit
13 years, 2 monthsSL-6 R/B(2)’s lowest and highest points above Earth, week by week, from its tracking history.
Also ended on 28 Jun 1999
4 entriesFrom the same launch
1986-031
Entered in the Orbital Register™, founding volume, September 2026.
Record version 1 · No corrections · orbitalradar.com/register/1999-0207
© 2026 Orbital Radar. Cite this entry by its number; the register itself may not be copied.
Record version 1 · No corrections · orbitalradar.com/register/1999-0207
© 2026 Orbital Radar. Cite this entry by its number; the register itself may not be copied.