COSMOS 2170, 21784
Orbit data source: Space-Track
COSMOS 2170, 21784 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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21784 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, Medium (>0.1 m² and < 1m²)
Expand to show TLE details & historyLast TLE update: 7 hours ago
TLE from 7 hours ago
0 COSMOS 2170
1 21784U 91077F 25358.83460954 .00000002 00000-0 -50087-4 0 9995
2 21784 82.6090 19.9303 0002084 357.2642 175.6726 12.62581965572077Epoch: 2025-12-24T20:01Z
TLE epoch observation values (Epoch: 2025-12-24T20:01:50.264Z)
Latitude
6.93383°
Longitude
164.97313°
Altitude
1,416.026 km
Speed
7.152 km/s
True Right ascension
13h 16m 07s
True Declination
6° 53' 46"
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
02:41:46
Azimuth
Unknown
Elevation
Unknown
Doppler factor
Unknown
Orbital elements
Apogee altitude
1,411.248 km
Perigee altitude
1,408.002 km
Semi-major axis
7,787.762 km
Eccentricity
0.00021
Inclination
82.609°
RAAN
19.9303°
Arg. of periapsis
357.2642°
True anomaly
175.6744°
Mean anomaly
175.6726°
Eccentric anomaly
175.6735°
Mean motion
3.15809 °/min
Orbital period
113.99 mins
BSTAR
-0.000050087
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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 2170 Visibility forecast
Loading observer location...
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 | 2025-12-25 12:51:38.309Z | 5.933° NNE | 2025-12-25 12:57:38.309Z | 71.226° E | 38.966° | 2025-12-25 13:05:38.309Z | 152.943° SSE |
| 12 mins | 2025-12-25 14:46:38.309Z | 327.58° NNW | 2025-12-25 14:52:38.309Z | 273.001° WNW | 26.872° | 2025-12-25 14:58:38.309Z | 222.147° SW |
| 14 mins | 2025-12-26 01:38:38.309Z | 161.714° S | 2025-12-26 01:45:38.309Z | 84.536° E | 39.115° | 2025-12-26 01:52:38.309Z | 17.957° NNE |
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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