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: 15 hours ago
TLE from 15 hours ago
0 COSMOS 2166
1 21780U 91077B 26235.37047406 .00000031 00000-0 11076-3 0 9993
2 21780 82.5990 203.4605 0003985 26.1707 126.8935 12.63449950603658Epoch: 2026-08-23T08:53Z
TLE epoch observation values (Epoch: 2026-08-23T08:53:28.958Z)
Latitude
26.69102°
Longitude
-85.3035°
Altitude
1,413.713 km
Speed
7.155 km/s
True Right ascension
01h 18m 56s
True Declination
26° 33' 53"
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
14:58:46
Azimuth
Unknown
Elevation
Unknown
Doppler factor
Unknown
Orbital elements
Apogee altitude
1,409.157 km
Perigee altitude
1,402.953 km
Semi-major axis
7,784.192 km
Eccentricity
0.0004
Inclination
82.599°
RAAN
203.4605°
Arg. of periapsis
26.1707°
True anomaly
126.93001°
Mean anomaly
126.8935°
Eccentric anomaly
126.91176°
Mean motion
3.16026 °/min
Orbital period
113.91 mins
BSTAR
0.00011076
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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. |
|---|---|---|---|---|---|---|---|
| 4 mins | 2026-08-24 07:33:07.305Z | 46.433° ENE | 2026-08-24 07:35:07.305Z | 61.064° ENE | 11.293° | 2026-08-24 07:37:07.305Z | 75.418° E |
| 14 mins | 2026-08-24 09:25:07.305Z | 1.428° NNE | 2026-08-24 09:31:07.305Z | 68.651° E | 42.212° | 2026-08-24 09:39:07.305Z | 160.577° S |
| 10 mins | 2026-08-24 11:21:07.305Z | 317.894° NNW | 2026-08-24 11:25:07.305Z | 282.945° WNW | 22.596° | 2026-08-24 11:31:07.305Z | 232.116° WSW |
| 15 mins | 2026-08-24 22:11:07.305Z | 170.387° S | 2026-08-24 22:18:07.305Z | 98.071° ESE | 42.318° | 2026-08-24 22:26:07.305Z | 13.671° 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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