Key statistics
Satellite SL-8 R/B at a glance.
Uptime
17370
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: 99.848 minutes
Inclination: 74.0249 deg
SMA: 7129.404 km
Apoapsis: 766.565 km
Periapsis: 735.973 km
RAAN: 220.2225 deg
Eccentricy: 0.0021455
Argument of periapsis: 238.3694 deg
Mean anomaly: 121.5369 deg
Mean motion: 14.42191543 rev/day
Mean motion (dot): 0.00000151 rev/day2
B* drag term: 0.000053953 1/REarth
Two-line elements (TLE)
Creation date: July 6, 2025, 10:26 p.m.
Reference frame: TEME
Reference center: EARTH
Epoch: July 6, 2025, 1:32 p.m. UTC
TLE line 0: 0 SL-8 R/B
TLE line 1: 1 10521U 77119B 25187.56391211 .00000151 00000-0 53953-4 0 9991
TLE line 2: 2 10521 74.0249 220.2225 0021455 238.3694 121.5369 14.42191543495946
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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