COSMOS 2146, 21302
Orbit data source: Space-Track
COSMOS 2146, 21302 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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21302 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 2146
1 21302U 91033D 26171.37230932 .00000034 00000-0 12735-3 0 9998
2 21302 82.5762 292.3364 0016221 26.2861 333.9051 12.64553823619724Epoch: 2026-06-20T08:56Z
TLE epoch observation values (Epoch: 2026-06-20T08:56:07.525Z)
Latitude
-0.00003°
Longitude
-110.28284°
Altitude
1,395.603 km
Speed
7.167 km/s
True Right ascension
19h 29m 20s
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
02:17:36
Azimuth
Unknown
Elevation
Unknown
Doppler factor
Unknown
Orbital elements
Apogee altitude
1,414.142 km
Perigee altitude
1,388.903 km
Semi-major axis
7,779.659 km
Eccentricity
0.00162
Inclination
82.5762°
RAAN
292.3364°
Arg. of periapsis
26.2861°
True anomaly
333.82319°
Mean anomaly
333.9051°
Eccentric anomaly
333.86416°
Mean motion
3.16302 °/min
Orbital period
113.82 mins
BSTAR
0.00012735
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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 2146 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. |
|---|---|---|---|---|---|---|---|
| 13 mins | 2026-06-22 18:30:48.062Z | 14.507° NNE | 2026-06-22 18:36:48.062Z | 66.961° ENE | 27.36° | 2026-06-22 18:43:48.062Z | 128.527° SE |
| 14 mins | 2026-06-22 20:25:48.062Z | 339.814° N | 2026-06-22 20:31:48.062Z | 279.911° WNW | 38.813° | 2026-06-22 20:39:48.062Z | 196.737° SSW |
| 12 mins | 2026-06-23 07:18:48.062Z | 133.822° SE | 2026-06-23 07:23:48.062Z | 89.374° E | 26.358° | 2026-06-23 07:30:48.062Z | 28.768° NE |
| 14 mins | 2026-06-23 09:11:48.062Z | 209.111° SW | 2026-06-23 09:18:48.062Z | 288.602° WNW | 39.046° | 2026-06-23 09:25:48.062Z | 357.329° 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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