Key statistics
Satellite SL-8 R/B at a glance.
Uptime
17431
Days in orbit
Revolutions
≈ 14.4
Per day
Orbit
LEO
Low Earth Orbit
Inclination
74.0
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: 1977-119B
Object number (NORAD): 10521
Object ID (CCSDS): 10521
Country: COMMONWEALTH OF INDEPENDENT STATES (CIS)
Current information (Y/N): Y
RCS size: LARGE
Orbital parameters
Period: 99.846 minutes
Inclination: 74.0252 deg
SMA: 7129.299 km
Apoapsis: 765.02 km
Periapsis: 737.308 km
RAAN: 106.3258 deg
Eccentricy: 0.00194355
Argument of periapsis: 108.4444 deg
Mean anomaly: 251.8827 deg
Mean motion: 14.42223299 rev/day
Mean motion (dot): 0.00000447 rev/day2
B* drag term: 0.00014324311 1/REarth
Two-line elements (TLE)
Creation date: Sept. 6, 2025, 2:09 a.m.
Reference frame: TEME
Reference center: EARTH
Epoch: Sept. 5, 2025, 10:52 p.m. UTC
TLE line 0: 0 SL-8 R/B
TLE line 1: 1 10521U 77119B 25248.95322298 .00000447 00000-0 14324-3 0 9997
TLE line 2: 2 10521 74.0252 106.3258 0019435 108.4444 251.8827 14.42223299504485
Live tracking on map
Real-time ground track for satellite SL-8 R/B.
In-orbit conjunctions
A list of the most updated potential collisions computed for object SL-8 R/B.
Associated space launch
Military communications satellite
SL-8 R/B was lifted into orbit during the mission ‘Kosmos-3M | Strela-2M 16’, on board a Kosmos-3M space rocket.
The launch took place on Dec. 16, 1977, 4:25 a.m. from 132/1 (132L).
For more information about the launch, click the button.
Kosmos-3M | Strela-2M 16
Agency: N/A
Status: Launch Successful
Launch date: Dec. 16, 1977, 4:25 a.m. UTC
Rocket: Kosmos-3M
Launch pad: 132/1 (132L)
Location: Plesetsk Cosmodrome, Russian Federation
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