COSMOS 2166, 21780
Orbit data source: Space-Track
COSMOS 2166, 21780 is a payload satellite owned by UNKS RF (CIS) in LEO that was launched on Tue, 12 Nov 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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21780 intel report (Beta)
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Edit Public Description
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: 13 hours ago
TLE from 13 hours ago
0 COSMOS 2166
1 21780U 91077B 25340.62627086 .00000053 00000-0 23507-3 0 9991
2 21780 82.6005 9.1013 0002600 220.4050 259.8351 12.63442989570852Epoch: 2025-12-06T15:01Z
TLE epoch observation values (Epoch: 2025-12-06T15:01:49.802Z)
Latitude
59.06875°
Longitude
-124.46154°
Altitude
1,419.082 km
Speed
7.156 km/s
True Right ascension
11h 46m 35s
True Declination
58° 55' 47"
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
01:39:27
Azimuth
Unknown
Elevation
Unknown
Doppler factor
Unknown
Orbital elements
Apogee altitude
1,408.108 km
Perigee altitude
1,404.06 km
Semi-major axis
7,784.221 km
Eccentricity
0.00026
Inclination
82.6005°
RAAN
9.1013°
Arg. of periapsis
220.405°
True anomaly
259.80578°
Mean anomaly
259.8351°
Eccentric anomaly
259.82044°
Mean motion
3.16024 °/min
Orbital period
113.92 mins
BSTAR
0.00023507
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Other satellites on launch #77 in the year 1991 (1991-11-12 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 2166 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. |
|---|---|---|---|---|---|---|---|
| 14 mins | 2025-12-07 03:48:15.950Z | 220.257° SW | 2025-12-07 03:55:15.950Z | 283.261° WNW | 32.799° | 2025-12-07 04:02:15.950Z | 350.936° N |
| 7 mins | 2025-12-07 11:57:15.950Z | 39.482° NE | 2025-12-07 12:00:15.950Z | 63.417° ENE | 15.266° | 2025-12-07 12:04:15.950Z | 93.751° ESE |
| 15 mins | 2025-12-07 13:49:15.950Z | 354.586° N | 2025-12-07 13:56:15.950Z | 74.888° E | 44.773° | 2025-12-07 14:04:15.950Z | 170.972° S |
| 9 mins | 2025-12-07 15:46:15.950Z | 312.43° NW | 2025-12-07 15:50:15.950Z | 279.956° WNW | 17.56° | 2025-12-07 15:55:15.950Z | 242.125° WSW |
| 6 mins | 2025-12-08 00:47:15.950Z | 94.132° ESE | 2025-12-08 00:49:15.950Z | 78.663° E | 14.065° | 2025-12-08 00:53:15.950Z | 48.788° ENE |
| 15 mins | 2025-12-08 02:36:15.950Z | 181.086° SSW | 2025-12-08 02:43:15.950Z | 68.53° E | 44.753° | 2025-12-08 02:51:15.950Z | 9.242° NNE |
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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