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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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, 0.9 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 26306.08579909 .00000008 00000-0 -13044-4 0 9991
2 21780 82.5987 158.3975 0002860 193.2256 322.3269 12.63451330612588Epoch: 2026-11-02T02:03Z
TLE epoch observation values (Epoch: 2026-11-02T02:03:33.041Z)
Latitude
24.2735°
Longitude
-97.19974°
Altitude
1,409.759 km
Speed
7.158 km/s
True Right ascension
22h 20m 13s
True Declination
24° 09' 20"
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
11:15:18
Azimuth
Unknown
Elevation
Unknown
Doppler factor
Unknown
Orbital elements
Apogee altitude
1,408.276 km
Perigee altitude
1,403.823 km
Semi-major axis
7,784.187 km
Eccentricity
0.00029
Inclination
82.5987°
RAAN
158.3975°
Arg. of periapsis
193.2256°
True anomaly
322.30686°
Mean anomaly
322.3269°
Eccentric anomaly
322.31688°
Mean motion
3.16026 °/min
Orbital period
113.91 mins
BSTAR
-0.000013044
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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 | 2026-11-02 16:34:06.216Z | 238.791° WSW | 2026-11-02 16:41:06.216Z | 296.891° NW | 25.809° | 2026-11-02 16:47:06.216Z | 344.581° N |
| 12 mins | 2026-11-03 00:40:06.216Z | 20.984° NNE | 2026-11-03 00:45:06.216Z | 63.323° ENE | 25.443° | 2026-11-03 00:52:06.216Z | 120.96° SE |
| 15 mins | 2026-11-03 02:34:06.216Z | 345.174° N | 2026-11-03 02:41:06.216Z | 265.962° W | 65.915° | 2026-11-03 02:49:06.216Z | 188.291° SSW |
| 10 mins | 2026-11-03 13:29:06.216Z | 122.25° SE | 2026-11-03 13:34:06.216Z | 77.513° E | 24.643° | 2026-11-03 13:39:06.216Z | 36.487° NE |
| 7 mins | 2026-11-03 15:21:06.216Z | 201.048° SSW | 2026-11-03 15:28:06.216Z | 289.782° WNW | 65.383° | 2026-11-03 15:28:06.216Z | 289.782° WNW |
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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