Key statistics
Satellite SL-8 DEB at a glance.
Uptime
12684
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: 117.151 minutes
Inclination: 74.0821 deg
SMA: 7930.912 km
Apoapsis: 1724.964 km
Periapsis: 1380.589 km
RAAN: 224.4309 deg
Eccentricy: 0.02171093
Argument of periapsis: 213.7107 deg
Mean anomaly: 267.1339 deg
Mean motion: 12.29187361 rev/day
Mean motion (dot): -0.00000033 rev/day2
B* drag term: -0.00013786338 1/REarth
Two-line elements (TLE)
Creation date: Nov. 2, 2025, 5:34 p.m.
Reference frame: TEME
Reference center: EARTH
Epoch: Nov. 2, 2025, 4:38 a.m. UTC
TLE line 0: 0 SL-8 DEB
TLE line 1: 1 21138U 91009Q 25306.19356562 -.00000033 00000-0 -13786-3 0 9993
TLE line 2: 2 21138 74.0821 224.4309 0217109 213.7107 267.1339 12.29187361557956
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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