Key statistics
Satellite SL-8 R/B at a glance.
Uptime
12731
Days in orbit
Revolutions
≈ 13.8
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: 1991-007B
Object number (NORAD): 21090
Object ID (CCSDS): 21090
Country: COMMONWEALTH OF INDEPENDENT STATES (CIS)
Current information (Y/N): Y
RCS size: LARGE
Orbital parameters
Period: 104.602 minutes
Inclination: 82.9209 deg
SMA: 7353.928 km
Apoapsis: 990.927 km
Periapsis: 960.659 km
RAAN: 88.557 deg
Eccentricy: 0.00205794
Argument of periapsis: 8.6392 deg
Mean anomaly: 351.5115 deg
Mean motion: 13.76650584 rev/day
Mean motion (dot): 0.00000072 rev/day2
B* drag term: 0.000058077021 1/REarth
Two-line elements (TLE)
Creation date: Dec. 14, 2025, 3:07 a.m.
Reference frame: TEME
Reference center: EARTH
Epoch: Dec. 13, 2025, 2:58 p.m. UTC
TLE line 0: 0 SL-8 R/B
TLE line 1: 1 21090U 91007B 25347.62395044 .00000072 00000-0 58077-4 0 9993
TLE line 2: 2 21090 82.9209 88.5570 0020579 8.6392 351.5115 13.76650584750376
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
Civilian navigation satellite equivalent to the purely military Parus
SL-8 R/B was lifted into orbit during the mission ‘Kosmos-3M | Tsikada 17’, on board a Kosmos-3M space rocket.
The launch took place on Feb. 5, 1991, 2:36 a.m. from 133/3 (133L).
For more information about the launch, click the button.
Kosmos-3M | Tsikada 17
Agency: N/A
Status: Launch Successful
Launch date: Feb. 5, 1991, 2:36 a.m. UTC
Rocket: Kosmos-3M
Launch pad: 133/3 (133L)
Location: Plesetsk Cosmodrome, Russian Federation
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