CERTIFICATE OF RE-ENTRYOrbital Register™ · by Orbital Radar™
Orbital Register seal
Entry no.
1991-0167

SL-12 R/B(2)

SL-12 R/B(2) (NORAD 17910) re-entered Earth’s atmosphere on 12 April 1991, after 3 years, 11 months in orbit.

Official date
NORAD number
17910
International designator
1987-036G
Object type
Rocket body
Country
USSR
Launched
24 Apr 1987Baikonur Cosmodrome
Re-entered (UTC)
12 Apr 1991UTC calendar day
Time in orbit
3 years, 11 months1,449 days
How it ended
Re-entered (natural decay)
Latitude range
64.3°N to 64.3°SFinal inclination 64.3°
Mass
17,490 kg

Where it came down

Latitude band its orbit allowed
Exact position not recorded

No position was recorded for this re-entry. Its final orbit, inclined at 64.3°, allowed a re-entry anywhere between 64.3°N and 64.3°S.

Life in orbit

3 years, 11 months

SL-12 R/B(2)’s lowest and highest points above Earth, week by week, from its tracking history.

Also ended on 12 Apr 1991

2 entries
1991-0168DMSP 5D-2 F10 DEB1991-0169DMSP 5D-2 F10 DEB

From the same launch

1987-036
1987-0150SL-12 R/B(1)1987-0313SL-12 R/B(AUX MOTOR)1987-0549SL-12 R/B(AUX MOTOR)1991-0199COSMOS 1839 (GLONASS)1991-0209COSMOS 1838 (GLONASS)1991-0398COSMOS 1840 (GLONASS)
Orbital Register seal
Entered in the Orbital Register™, founding volume, September 2026.
Record version 1 · No corrections · orbitalradar.com/register/1991-0167
© 2026 Orbital Radar. Cite this entry by its number; the register itself may not be copied.