Key statistics
Satellite SL-8 R/B at a glance.
Uptime
12646
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: 1991-019B
Object number (NORAD): 21153
Object ID (CCSDS): 21153
Country: COMMONWEALTH OF INDEPENDENT STATES (CIS)
Current information (Y/N): Y
RCS size: LARGE
Orbital parameters
Period: 104.628 minutes
Inclination: 82.9218 deg
SMA: 7355.138 km
Apoapsis: 997.41 km
Periapsis: 956.596 km
RAAN: 92.1009 deg
Eccentricy: 0.00277456
Argument of periapsis: 263.9177 deg
Mean anomaly: 216.2195 deg
Mean motion: 13.7631076 rev/day
Mean motion (dot): 0.00000195 rev/day2
B* drag term: 0.00018471425 1/REarth
Two-line elements (TLE)
Creation date: Oct. 25, 2025, 3:11 a.m.
Reference frame: TEME
Reference center: EARTH
Epoch: Oct. 24, 2025, 10:57 p.m. UTC
TLE line 0: 0 SL-8 R/B
TLE line 1: 1 21153U 91019B 25297.95672360 .00000195 00000-0 18471-3 0 9994
TLE line 2: 2 21153 82.9218 92.1009 0027746 263.9177 216.2195 13.76310760738093
Live tracking on map
Real-time ground track for satellite 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 | Nadezhda 6’, on board a Kosmos-3M space rocket.
The launch took place on March 12, 1991, 7:29 p.m. from 133/3 (133L).
For more information about the launch, click the button.
Kosmos-3M | Nadezhda 6
Agency: N/A
Status: Launch Successful
Launch date: March 12, 1991, 7:29 p.m. UTC
Rocket: Kosmos-3M
Launch pad: 133/3 (133L)
Location: Plesetsk Cosmodrome, Russian Federation
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