COSMOS 2145, 21301
Orbit data source: Space-Track
COSMOS 2145, 21301 is a payload satellite owned by UNKS RF (CIS) in LEO that was launched on Thu, 16 May 1991 UTC via a TSIKLON-3 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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21301 intel report (Beta)
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Identifier
Orbit
Country
CISRelated business
Manufacturer
NPO PM
Mission
Defense Communications
Bus & Motor
STRELA-3, Unknown motor
Mass
225 kg wet, 225 kg dry
Launch date (UTC)
Launch vehicle
Launch site
Object type
Shape & HBR
Cyl, 0.8 m
Radar Cross Section
1.257 m², Large (>1 m²)
Expand to show TLE details & historyLast TLE update: 2 days ago
TLE from 2 days ago
0 COSMOS 2145
1 21301U 91033C 26171.42991089 .00000032 00000-0 11748-3 0 9991
2 21301 82.5676 305.1773 0009483 85.5184 274.6990 12.63217064617917Epoch: 2026-06-20T10:19Z
TLE epoch observation values (Epoch: 2026-06-20T10:19:04.300Z)
Latitude
-0.00012°
Longitude
-118.23528°
Altitude
1,411.827 km
Speed
7.155 km/s
True Right ascension
20h 20m 42s
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
00:50:52
Azimuth
Unknown
Elevation
Unknown
Doppler factor
Unknown
Orbital elements
Apogee altitude
1,414.396 km
Perigee altitude
1,399.631 km
Semi-major axis
7,785.151 km
Eccentricity
0.00095
Inclination
82.5676°
RAAN
305.1773°
Arg. of periapsis
85.5184°
True anomaly
274.59069°
Mean anomaly
274.699°
Eccentric anomaly
274.64484°
Mean motion
3.15968 °/min
Orbital period
113.94 mins
BSTAR
0.00011748
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Other satellites on launch #33 in the year 1991 (1991-05-16 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 2145 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 | 2026-06-22 19:56:18.961Z | 1.586° NNE | 2026-06-22 20:04:18.961Z | 76.258° E | 38.125° | 2026-06-22 20:12:18.961Z | 151.731° SSE |
| 12 mins | 2026-06-22 21:53:18.961Z | 327.108° NNW | 2026-06-22 21:59:18.961Z | 269.565° W | 27.688° | 2026-06-22 22:05:18.961Z | 219.515° SW |
| 14 mins | 2026-06-23 08:45:18.961Z | 158.08° S | 2026-06-23 08:51:18.961Z | 95.716° ESE | 38.005° | 2026-06-23 08:59:18.961Z | 17.767° NNE |
| 12 mins | 2026-06-23 10:41:18.961Z | 236.185° WSW | 2026-06-23 10:46:18.961Z | 283.101° WNW | 28.114° | 2026-06-23 10:53:18.961Z | 347.285° N |
Co-orbital & Co-planar RSOs
Thresholds — Semi-major Axis: ±100 km, RAAN: ±3°, Inclination: ±5°
TCA is derived from TLE conjunctions
Click to sort rows by RSO header in ascending order | Click to sort rows by Country header in ascending order | Click to sort rows by Type header in ascending order | Click to sort rows by Inclination Δ header in ascending order | Click to sort rows by RAAN Δ header in ascending order | Click to sort rows by Coplanar Angle header in ascending order | Click to sort rows by SMA Δ header in ascending order | Click to sort rows by Orbital period header in ascending order | Click to sort rows by <5km Md TCA header in descending order |
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CAUTION: Conjunctions in this section are generated from low-fidelity TLE screenings
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