Key statistics
Satellite SL-8 R/B at a glance.
Uptime
16306
Days in orbit
Revolutions
≈ 15.0
Per day
Orbit
LEO
Low Earth Orbit
Inclination
82.9
Latest
Satellite identification and parameters
Extended collection of information and parameters for SL-8 R/B.
Object identification
Identified? True
Debris? False
Object name: SL-8 R/B
International designator: 1981-003B
Object number (NORAD): 12139
Object ID (CCSDS): 12139
Country: COMMONWEALTH OF INDEPENDENT STATES (CIS)
Current information (Y/N): Y
RCS size: LARGE
Orbital parameters
Period: 95.849 minutes
Inclination: 82.9277 deg
SMA: 6937.731 km
Apoapsis: 765.164 km
Periapsis: 354.029 km
RAAN: 99.0464 deg
Eccentricy: 0.0296303
Argument of periapsis: 94.4589 deg
Mean anomaly: 269.0547 deg
Mean motion: 15.02368711 rev/day
Mean motion (dot): 0.0002933 rev/day2
B* drag term: 0.0008290022 1/REarth
Two-line elements (TLE)
Creation date: Sept. 7, 2025, 3:09 a.m.
Reference frame: TEME
Reference center: EARTH
Epoch: Sept. 6, 2025, 8:07 p.m. UTC
TLE line 0: 0 SL-8 R/B
TLE line 1: 1 12139U 81003B 25249.83846579 .00029330 00000-0 82900-3 0 9999
TLE line 2: 2 12139 82.9277 99.0464 0296303 94.4589 269.0547 15.02368711286998
Live tracking on map
Real-time ground track for satellite SL-8 R/B.
Associated space launch
Film-return reconnaissance satellite
SL-8 R/B was lifted into orbit during the mission ‘Soyuz U | Zenit-4MT 20’, on board a Soyuz U space rocket.
The launch took place on Jan. 16, 1981, noon from 41/1.
For more information about the launch, click the button.
Soyuz U | Zenit-4MT 20
Agency: N/A
Status: Launch Successful
Launch date: Jan. 16, 1981, noon UTC
Rocket: Soyuz U
Launch pad: 41/1
Location: Plesetsk Cosmodrome, Russian Federation
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