COSMOS 2126, 21101
Orbit data source: Space-Track
COSMOS 2126, 21101 is a payload satellite owned by UNKS RF (CIS) in LEO that was launched on Tue, 12 Feb 1991 UTC via a KOSMOS 11K65M launch vehicle from the Plesetsk Missile And Space Complex (PKMTR). Payload-class satellites include a variety of spacecraft equipped with specific instruments for various scientific and technological missions. These include communications satellites like Starlink; space stations such as the ISS; scientific satellites like the Hubble; Earth observation satellites from companies like Planet Labs, Umbra, and HawkEye 360; GPS; miniature CubeSats for education and research; and military/defense satellites.
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21101 intel report (Beta)
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Identifier
Orbit
Country
CISRelated business
Manufacturer
NPO PM
Mission
Defense Communications
Bus & Motor
STRELA-1 11F625, Unknown motor
Mass
60 kg wet, 60 kg dry
Launch date (UTC)
Launch vehicle
Launch site
Object type
Shape & HBR
Sphere, 0.4 m
Radar Cross Section
0.588 m², Medium (>0.1 m² and < 1m²)
Expand to show TLE details & historyLast TLE update: 16 hours ago
TLE from 16 hours ago
0 COSMOS 2126
1 21101U 91009B 26154.55136609 -.00000011 00000-0 34811-4 0 9991
2 21101 74.0292 102.9909 0018456 84.4568 275.8585 12.46067524606010Epoch: 2026-06-03T13:13Z
TLE epoch observation values (Epoch: 2026-06-03T13:13:58.030Z)
Latitude
-0.00001°
Longitude
12.49075°
Altitude
1,481.908 km
Speed
7.123 km/s
True Right ascension
06h 51m 57s
True Declination
0° 00' 00"
Sunlit
Visualization orbit readout
Latitude
Unknown
Longitude
Unknown
Altitude
Unknown
Speed
Unknown
Apparent Right ascension
Unknown
Apparent Declination
Unknown
Sunlit
Visualization observer readout
Local Sidereal Time
15:12:04
Azimuth
Unknown
Elevation
Unknown
Doppler factor
Unknown
Orbital elements
Apogee altitude
1,493.327 km
Perigee altitude
1,464.326 km
Semi-major axis
7,856.963 km
Eccentricity
0.00185
Inclination
74.0292°
RAAN
102.9909°
Arg. of periapsis
84.4568°
True anomaly
275.64807°
Mean anomaly
275.8585°
Eccentric anomaly
275.75329°
Mean motion
3.11646 °/min
Orbital period
115.52 mins
BSTAR
0.000034811
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Other satellites on launch #9 in the year 1991 (1991-02-12 UTC)
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You can import UDL-sourced sensor .json files into the Sandbox to generate a visibility chart that accounts for multi-vendor sensor geometry.COSMOS 2126 Visibility forecast
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Span | Click to sort rows by Start time (UTC) header in descending order | Start Az. | Max El. time (UTC) | Max El. Az. | Max El. | End time (UTC) | End Az. |
|---|---|---|---|---|---|---|---|
| 16 mins | 2026-06-04 07:09:52.236Z | 350.682° N | 2026-06-04 07:17:52.236Z | 71.336° E | 38.469° | 2026-06-04 07:25:52.236Z | 139.98° SSE |
| 13 mins | 2026-06-04 09:08:52.236Z | 319.055° NNW | 2026-06-04 09:14:52.236Z | 267.188° W | 29.222° | 2026-06-04 09:21:52.236Z | 206.679° SW |
| 11 mins | 2026-06-04 20:10:52.236Z | 136.355° SSE | 2026-06-04 20:15:52.236Z | 94.157° ESE | 23.663° | 2026-06-04 20:21:52.236Z | 45.68° ENE |
| 15 mins | 2026-06-04 22:05:52.236Z | 212.112° SW | 2026-06-04 22:12:52.236Z | 282.122° WNW | 42.432° | 2026-06-04 22:20:52.236Z | 13.032° NNE |
| 7 mins | 2026-06-05 00:09:52.236Z | 292.294° WNW | 2026-06-05 00:12:52.236Z | 314.579° NW | 14.653° | 2026-06-05 00:16:52.236Z | 343.819° N |
Co-orbital & Co-planar RSOs
Thresholds — Semi-major Axis: ±100 km, RAAN: ±3°, Inclination: ±5°
TCA is derived from TLE conjunctions
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CAUTION: Conjunctions in this section are generated from low-fidelity TLE screenings
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