Key statistics
Satellite SL-8 DEB at a glance.
Uptime
12729
Days in orbit
Revolutions
≈ 12.3
Per day
Orbit
LEO
Low Earth Orbit
Inclination
74.1
Latest
Satellite identification and parameters
Extended collection of information and parameters for SL-8 DEB.
Object identification
Identified? True
Debris? True
Object name: SL-8 DEB
International designator: 1991-009Q
Object number (NORAD): 21138
Object ID (CCSDS): 21138
Country: COMMONWEALTH OF INDEPENDENT STATES (CIS)
Current information (Y/N): Y
RCS size: MEDIUM
Orbital parameters
Period: 117.15 minutes
Inclination: 74.0787 deg
SMA: 7930.907 km
Apoapsis: 1724.417 km
Periapsis: 1381.128 km
RAAN: 164.9827 deg
Eccentricy: 0.02164248
Argument of periapsis: 145.9795 deg
Mean anomaly: 330.4216 deg
Mean motion: 12.29188429 rev/day
Mean motion (dot): -0.00000006 rev/day2
B* drag term: 0.000064243509 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, 7:46 p.m. UTC
TLE line 0: 0 SL-8 DEB
TLE line 1: 1 21138U 91009Q 25352.82400881 -.00000006 00000-0 64244-4 0 9993
TLE line 2: 2 21138 74.0787 164.9827 0216425 145.9795 330.4216 12.29188429563680
Live tracking on map
Real-time ground track for satellite SL-8 DEB.
Associated space launch
Military communications satellites
SL-8 DEB was lifted into orbit during the mission ‘Kosmos-3M | Strela-1M 353-360’, on board a Kosmos-3M space rocket.
The launch took place on Feb. 12, 1991, 2:44 a.m. from 133/3 (133L).
For more information about the launch, click the button.
Kosmos-3M | Strela-1M 353-360
Agency: N/A
Status: Launch Successful
Launch date: Feb. 12, 1991, 2:44 a.m. UTC
Rocket: Kosmos-3M
Launch pad: 133/3 (133L)
Location: Plesetsk Cosmodrome, Russian Federation
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