Key statistics
Satellite SL-8 R/B at a glance.
Uptime
17645
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: 1977-059B
Object number (NORAD): 10121
Object ID (CCSDS): 10121
Country: COMMONWEALTH OF INDEPENDENT STATES (CIS)
Current information (Y/N): Y
RCS size: LARGE
Orbital parameters
Period: 100.191 minutes
Inclination: 74.0444 deg
SMA: 7145.726 km
Apoapsis: 781.711 km
Periapsis: 753.472 km
RAAN: 297.6391 deg
Eccentricy: 0.00197596
Argument of periapsis: 257.6305 deg
Mean anomaly: 102.2637 deg
Mean motion: 14.37252883 rev/day
Mean motion (dot): 0.00000513 rev/day2
B* drag term: 0.00018074617 1/REarth
Two-line elements (TLE)
Creation date: Oct. 21, 2025, 6:24 p.m.
Reference frame: TEME
Reference center: EARTH
Epoch: Oct. 21, 2025, 10:56 a.m. UTC
TLE line 0: 0 SL-8 R/B
TLE line 1: 1 10121U 77059B 25294.45600052 .00000513 00000-0 18075-3 0 9990
TLE line 2: 2 10121 74.0444 297.6391 0019760 257.6305 102.2637 14.37252883527196
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 15’, on board a Kosmos-3M space rocket.
The launch took place on July 1, 1977, 11:52 a.m. from 132/1 (132L).
For more information about the launch, click the button.
Kosmos-3M | Strela-2M 15
Agency: N/A
Status: Launch Successful
Launch date: July 1, 1977, 11:52 a.m. UTC
Rocket: Kosmos-3M
Launch pad: 132/1 (132L)
Location: Plesetsk Cosmodrome, Russian Federation
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