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, 0.8 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 26053.69303413 .00000027 00000-0 91879-4 0 9994
2 21780 82.6027 319.3264 0004427 62.6253 359.0458 12.63445253580714Epoch: 2026-02-22T16:37Z
TLE epoch observation values (Epoch: 2026-02-22T16:37:58.148Z)
Latitude
60.88519°
Longitude
-69.35075°
Altitude
1,415.659 km
Speed
7.16 km/s
True Right ascension
22h 10m 57s
True Declination
60° 45' 04"
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
08:37:47
Azimuth
Unknown
Elevation
Unknown
Doppler factor
Unknown
Orbital elements
Apogee altitude
1,409.521 km
Perigee altitude
1,402.628 km
Semi-major axis
7,784.211 km
Eccentricity
0.00044
Inclination
82.6027°
RAAN
319.3264°
Arg. of periapsis
62.6253°
True anomaly
359.04495°
Mean anomaly
359.0458°
Eccentric anomaly
359.04538°
Mean motion
3.16025 °/min
Orbital period
113.92 mins
BSTAR
0.000091879
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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. |
|---|---|---|---|---|---|---|---|
| 15 mins | 2026-02-23 06:13:45.934Z | 340.842° N | 2026-02-23 06:20:45.934Z | 275.931° WNW | 37.665° | 2026-02-23 06:28:45.934Z | 198.754° SSW |
| 12 mins | 2026-02-23 17:07:45.934Z | 138.201° SSE | 2026-02-23 17:13:45.934Z | 82.215° E | 28.231° | 2026-02-23 17:19:45.934Z | 29.479° NE |
| 14 mins | 2026-02-23 19:01:45.934Z | 213.67° SW | 2026-02-23 19:07:45.934Z | 276.045° WNW | 37.639° | 2026-02-23 19:15:45.934Z | 357.195° N |
| 4 mins | 2026-02-24 03:10:45.934Z | 46.431° ENE | 2026-02-24 03:12:45.934Z | 61.16° ENE | 11.5° | 2026-02-24 03:14:45.934Z | 75.619° E |
| 14 mins | 2026-02-24 05:02:45.934Z | 1.075° NNE | 2026-02-24 05:08:45.934Z | 68.616° E | 42.43° | 2026-02-24 05:16:45.934Z | 161.22° S |
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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