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 25312.71153247 .00000047 00000-0 20157-3 0 9998
2 21784 82.6115 49.2542 0003438 83.3465 71.3045 12.62580789566252Epoch: 2025-11-08T17:04Z
TLE epoch observation values (Epoch: 2025-11-08T17:04:36.405Z)
Latitude
25.11364°
Longitude
-78.50212°
Altitude
1,414.348 km
Speed
7.156 km/s
True Right ascension
15h 03m 08s
True Declination
24° 59' 34"
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
06:29:06
Azimuth
Unknown
Elevation
Unknown
Doppler factor
Unknown
Orbital elements
Apogee altitude
1,412.307 km
Perigee altitude
1,406.952 km
Semi-major axis
7,787.766 km
Eccentricity
0.00034
Inclination
82.6115°
RAAN
49.2542°
Arg. of periapsis
83.3465°
True anomaly
71.34182°
Mean anomaly
71.3045°
Eccentric anomaly
71.32316°
Mean motion
3.15808 °/min
Orbital period
113.99 mins
BSTAR
0.00020157
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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. |
|---|---|---|---|---|---|---|---|
| 15 mins | 2025-11-09 17:35:12.464Z | 4.911° NNE | 2025-11-09 17:43:12.464Z | 84.835° E | 35.333° | 2025-11-09 17:50:12.464Z | 145.639° SSE |
| 13 mins | 2025-11-09 19:31:12.464Z | 332.297° NNW | 2025-11-09 19:37:12.464Z | 277.679° WNW | 30.695° | 2025-11-09 19:44:12.464Z | 213.792° SW |
| 13 mins | 2025-11-10 06:24:12.464Z | 152.815° SSE | 2025-11-10 06:30:12.464Z | 92.711° ESE | 35.559° | 2025-11-10 06:37:12.464Z | 22.18° NNE |
| 13 mins | 2025-11-10 08:19:12.464Z | 227.342° WSW | 2025-11-10 08:25:12.464Z | 283.104° WNW | 30.776° | 2025-11-10 08:32:12.464Z | 349.259° N |
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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