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: 17 hours ago
TLE from 17 hours ago
0 COSMOS 2170
1 21784U 91077F 25261.03895094 .00000050 00000-0 21983-3 0 9991
2 21784 82.6034 82.1157 0002515 170.9086 314.1898 12.62578888559733Epoch: 2025-09-18T00:56Z
TLE epoch observation values (Epoch: 2025-09-18T00:56:05.361Z)
Latitude
54.3409°
Longitude
-119.48493°
Altitude
1,419.843 km
Speed
7.156 km/s
True Right ascension
16h 46m 58s
True Declination
54° 11' 30"
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
11:07:53
Azimuth
Unknown
Elevation
Unknown
Doppler factor
Unknown
Orbital elements
Apogee altitude
1,411.596 km
Perigee altitude
1,407.679 km
Semi-major axis
7,787.774 km
Eccentricity
0.00025
Inclination
82.6034°
RAAN
82.1157°
Arg. of periapsis
170.9086°
True anomaly
314.16913°
Mean anomaly
314.1898°
Eccentric anomaly
314.17947°
Mean motion
3.15808 °/min
Orbital period
113.99 mins
BSTAR
0.00021983
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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
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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. |
|---|---|---|---|---|---|---|---|
| 5 mins | 2025-09-18 21:50:41.211Z | 40.365° NE | 2025-09-18 21:53:41.211Z | 62.704° ENE | 12.449° | 2025-09-18 21:55:41.211Z | 77.485° E |
| 15 mins | 2025-09-18 23:42:41.211Z | 358.047° N | 2025-09-18 23:49:41.211Z | 71.718° E | 43.292° | 2025-09-18 23:57:41.211Z | 163.867° S |
| 10 mins | 2025-09-19 01:39:41.211Z | 316.329° NNW | 2025-09-19 01:43:41.211Z | 282.213° WNW | 21.013° | 2025-09-19 01:49:41.211Z | 233.898° WSW |
| 14 mins | 2025-09-19 12:30:41.211Z | 173.205° S | 2025-09-19 12:37:41.211Z | 69.81° E | 43.202° | 2025-09-19 12:44:41.211Z | 12.55° NNE |
| 11 mins | 2025-09-19 14:27:41.211Z | 248.847° W | 2025-09-19 14:32:41.211Z | 290.523° WNW | 21.679° | 2025-09-19 14:38:41.211Z | 340.218° N |
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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