Key statistics
Satellite SL-8 R/B at a glance.
Uptime
13042
Days in orbit
Revolutions
≈ 12.2
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: 1990-029J
Object number (NORAD): 20557
Object ID (CCSDS): 20557
Country: COMMONWEALTH OF INDEPENDENT STATES (CIS)
Current information (Y/N): Y
RCS size: LARGE
Orbital parameters
Period: 117.715 minutes
Inclination: 73.9868 deg
SMA: 7956.364 km
Apoapsis: 1698.581 km
Periapsis: 1457.876 km
RAAN: 289.2175 deg
Eccentricy: 0.01512662
Argument of periapsis: 57.7566 deg
Mean anomaly: 358.7717 deg
Mean motion: 12.23293946 rev/day
Mean motion (dot): 0.00000025 rev/day2
B* drag term: 0.0003527629 1/REarth
Two-line elements (TLE)
Creation date: Dec. 19, 2025, 2:08 a.m.
Reference frame: TEME
Reference center: EARTH
Epoch: Dec. 18, 2025, 9:57 p.m. UTC
TLE line 0: 0 SL-8 R/B
TLE line 1: 1 20557U 90029J 25352.91526685 .00000025 00000-0 35276-3 0 9991
TLE line 2: 2 20557 73.9868 289.2175 0151266 57.7566 358.7717 12.23293946593931
Live tracking on map
Real-time ground track for satellite SL-8 R/B.
Associated space launch
Military communications satellites
SL-8 R/B was lifted into orbit during the mission ‘Kosmos-3M | Strela-1M 345-352’, on board a Kosmos-3M space rocket.
The launch took place on April 6, 1990, 3:13 a.m. from 133/3 (133L).
For more information about the launch, click the button.
Kosmos-3M | Strela-1M 345-352
Agency: N/A
Status: Launch Successful
Launch date: April 6, 1990, 3:13 a.m. UTC
Rocket: Kosmos-3M
Launch pad: 133/3 (133L)
Location: Plesetsk Cosmodrome, Russian Federation
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