CERTIFICATE OF RE-ENTRYOrbital Register™ · by Orbital Radar™
Entry no.
1990-0190
SL-16 R/B
SL-16 R/B (NORAD 16439) re-entered Earth’s atmosphere on 4 April 1990, after 4 years, 3 months in orbit.
Official date
NORAD number
16439
International designator
1985-121F
Object type
Rocket body
Country
USSR
Launched
28 Dec 1985Baikonur Cosmodrome
Re-entered (UTC)
4 Apr 1990UTC calendar day
Time in orbit
4 years, 3 months1,558 days
How it ended
Re-entered (natural decay)
Latitude range
70.9°N to 70.9°SFinal inclination 70.9°
Mass
1 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 70.9°, allowed a re-entry anywhere between 70.9°N and 70.9°S.
Life in orbit
4 years, 3 monthsSL-16 R/B’s lowest and highest points above Earth, week by week, from its tracking history.
Also ended on 4 Apr 1990
1 entryFrom the same launch
1985-121
Entered in the Orbital Register™, founding volume, September 2026.
Record version 1 · No corrections · orbitalradar.com/register/1990-0190
© 2026 Orbital Radar. Cite this entry by its number; the register itself may not be copied.
Record version 1 · No corrections · orbitalradar.com/register/1990-0190
© 2026 Orbital Radar. Cite this entry by its number; the register itself may not be copied.