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: 12 hours ago
TLE from 12 hours ago
0 COSMOS 2170
1 21784U 91077F 25310.73016616 .00000019 00000-0 47304-4 0 9999
2 21784 82.6114 50.5136 0003475 86.6672 66.5929 12.62580586566007Epoch: 2025-11-06T17:31Z
TLE epoch observation values (Epoch: 2025-11-06T17:31:26.356Z)
Latitude
26.49707°
Longitude
-82.21867°
Altitude
1,414.32 km
Speed
7.156 km/s
True Right ascension
15h 07m 18s
True Declination
26° 22' 18"
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
01:57:47
Azimuth
Unknown
Elevation
Unknown
Doppler factor
Unknown
Orbital elements
Apogee altitude
1,412.336 km
Perigee altitude
1,406.924 km
Semi-major axis
7,787.767 km
Eccentricity
0.00035
Inclination
82.6114°
RAAN
50.5136°
Arg. of periapsis
86.6672°
True anomaly
66.62945°
Mean anomaly
66.5929°
Eccentric anomaly
66.61117°
Mean motion
3.15808 °/min
Orbital period
113.99 mins
BSTAR
0.000047304
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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. |
|---|---|---|---|---|---|---|---|
| 12 mins | 2025-11-07 06:08:29.788Z | 132.484° SE | 2025-11-07 06:14:29.788Z | 82.215° E | 24.294° | 2025-11-07 06:20:29.788Z | 32.403° NE |
| 14 mins | 2025-11-07 08:02:29.788Z | 205.614° SW | 2025-11-07 08:08:29.788Z | 271.608° WNW | 41.022° | 2025-11-07 08:16:29.788Z | 0.061° NNE |
| 14 mins | 2025-11-07 18:03:29.788Z | 3.864° NNE | 2025-11-07 18:10:29.788Z | 85.924° E | 39.55° | 2025-11-07 18:17:29.788Z | 153.258° SSE |
| 11 mins | 2025-11-07 19:59:29.788Z | 323.97° NNW | 2025-11-07 20:04:29.788Z | 278.233° WNW | 26.122° | 2025-11-07 20:10:29.788Z | 225.192° WSW |
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 ascending order |
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CAUTION: Conjunctions in this section are generated from low-fidelity TLE screenings
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