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: 10 hours ago
TLE from 10 hours ago
0 COSMOS 2170
1 21784U 91077F 25259.30624250 .00000050 00000-0 22012-3 0 9996
2 21784 82.6035 83.2182 0002436 174.8935 358.4840 12.62578835559518Epoch: 2025-09-16T07:20Z
TLE epoch observation values (Epoch: 2025-09-16T07:20:59.351Z)
Latitude
6.49681°
Longitude
156.6296°
Altitude
1,412.546 km
Speed
7.156 km/s
True Right ascension
17h 29m 30s
True Declination
6° 27' 41"
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
09:56:26
Azimuth
Unknown
Elevation
Unknown
Doppler factor
Unknown
Orbital elements
Apogee altitude
1,411.535 km
Perigee altitude
1,407.741 km
Semi-major axis
7,787.775 km
Eccentricity
0.00024
Inclination
82.6035°
RAAN
83.2182°
Arg. of periapsis
174.8935°
True anomaly
358.48326°
Mean anomaly
358.484°
Eccentric anomaly
358.48363°
Mean motion
3.15808 °/min
Orbital period
113.99 mins
BSTAR
0.00022012
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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. |
|---|---|---|---|---|---|---|---|
| 9 mins | 2025-09-16 22:16:18.239Z | 26.867° NE | 2025-09-16 22:21:18.239Z | 64.924° ENE | 15.79° | 2025-09-16 22:25:18.239Z | 95.39° ESE |
| 15 mins | 2025-09-17 00:10:18.239Z | 353.969° N | 2025-09-17 00:17:18.239Z | 91.208° ESE | 44.896° | 2025-09-17 00:25:18.239Z | 172.282° S |
| 8 mins | 2025-09-17 02:07:18.239Z | 311.886° NW | 2025-09-17 02:11:18.239Z | 279.81° WNW | 16.955° | 2025-09-17 02:15:18.239Z | 248.673° W |
| 6 mins | 2025-09-17 11:08:18.239Z | 97.175° ESE | 2025-09-17 11:11:18.239Z | 73.498° E | 14.771° | 2025-09-17 11:14:18.239Z | 50.782° ENE |
| 15 mins | 2025-09-17 12:57:18.239Z | 182.948° SSW | 2025-09-17 13:04:18.239Z | 142.996° SSE | 44.861° | 2025-09-17 13:12:18.239Z | 8.586° NNE |
| 9 mins | 2025-09-17 14:56:18.239Z | 261.217° W | 2025-09-17 15:00:18.239Z | 293.193° NW | 17.856° | 2025-09-17 15:05:18.239Z | 333.17° NNW |
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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