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 25310.70363924 .00000043 00000-0 17677-3 0 9995
2 21780 82.6034 28.1784 0002336 313.6387 214.7368 12.63441210567078Epoch: 2025-11-06T16:53Z
TLE epoch observation values (Epoch: 2025-11-06T16:53:14.430Z)
Latitude
11.49879°
Longitude
-92.79568°
Altitude
1,412.25 km
Speed
7.154 km/s
True Right ascension
13h 46m 41s
True Declination
11° 26' 15"
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
01:54:37
Azimuth
Unknown
Elevation
Unknown
Doppler factor
Unknown
Orbital elements
Apogee altitude
1,407.909 km
Perigee altitude
1,404.273 km
Semi-major axis
7,784.228 km
Eccentricity
0.00023
Inclination
82.6034°
RAAN
28.1784°
Arg. of periapsis
313.6387°
True anomaly
214.72155°
Mean anomaly
214.7368°
Eccentric anomaly
214.72917°
Mean motion
3.16024 °/min
Orbital period
113.92 mins
BSTAR
0.00017677
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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. |
|---|---|---|---|---|---|---|---|
| 13 mins | 2025-11-07 07:19:20.873Z | 231.23° WSW | 2025-11-07 07:26:20.873Z | 294.215° NW | 27.695° | 2025-11-07 07:32:20.873Z | 346.168° N |
| 10 mins | 2025-11-07 15:26:20.873Z | 28.367° NE | 2025-11-07 15:30:20.873Z | 61.274° ENE | 19.332° | 2025-11-07 15:36:20.873Z | 109.161° ESE |
| 15 mins | 2025-11-07 17:19:20.873Z | 349.685° N | 2025-11-07 17:26:20.873Z | 290.075° WNW | 44.473° | 2025-11-07 17:34:20.873Z | 180.429° SSW |
| 5 mins | 2025-11-07 19:18:20.873Z | 297.403° NW | 2025-11-07 19:20:20.873Z | 281.998° WNW | 13.271° | 2025-11-07 19:23:20.873Z | 259.933° W |
| 9 mins | 2025-11-08 04:15:20.873Z | 113.21° SE | 2025-11-08 04:19:20.873Z | 80.777° E | 18.438° | 2025-11-08 04:24:20.873Z | 41.178° NE |
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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