Key statistics
Satellite COSMOS 2129 at a glance.
Uptime
12678
Days in orbit
Revolutions
≈ 12.5
Per day
Orbit
LEO
Low Earth Orbit
Inclination
74.0
Latest
Satellite identification and parameters
Extended collection of information and parameters for COSMOS 2129.
Object identification
Identified? True
Debris? False
Object name: COSMOS 2129
International designator: 1991-009E
Object number (NORAD): 21104
Object ID (CCSDS): 21104
Country: COMMONWEALTH OF INDEPENDENT STATES (CIS)
Current information (Y/N): Y
RCS size: MEDIUM
Orbital parameters
Period: 114.856 minutes
Inclination: 74.0276 deg
SMA: 7827.03 km
Apoapsis: 1468.466 km
Periapsis: 1429.324 km
RAAN: 149.2641 deg
Eccentricy: 0.00250047
Argument of periapsis: 359.3869 deg
Mean anomaly: 29.6823 deg
Mean motion: 12.53739434 rev/day
Mean motion (dot): -0.00000015 rev/day2
B* drag term: 0.000005663498 1/REarth
Two-line elements (TLE)
Creation date: Oct. 28, 2025, 7:11 p.m.
Reference frame: TEME
Reference center: EARTH
Epoch: Oct. 28, 2025, 1:48 p.m. UTC
TLE line 0: 0 COSMOS 2129
TLE line 1: 1 21104U 91009E 25301.57504058 -.00000015 00000-0 56635-5 0 9999
TLE line 2: 2 21104 74.0276 149.2641 0025005 359.3869 29.6823 12.53739434588493
Live tracking on map
Real-time ground track for satellite COSMOS 2129.
In-orbit conjunctions
There are no conjunctions computed for COSMOS 2129, at the moment. Check back to stay up to date, as we update our databases every day.
Go to all conjunctionsAssociated space launch
Military communications satellites
COSMOS 2129 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
...
Latest news about this satellite
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