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.
Focus sentinelFocus sentinel
Request partner network tasking
Focus sentinelFocus sentinel
Embed this page
Focus sentinelFocus sentinel
21784 intel report (Beta)
Focus sentinelFocus sentinel
Edit Public Description
Focus sentinelFocus sentinel
Edit Sat Name
Focus sentinelFocus sentinel
Create New Watchlist
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 26143.83603801 .00000038 00000-0 15244-3 0 9991
2 21784 82.6071 284.5494 0002298 14.2282 140.5678 12.62587274591004Epoch: 2026-05-23T20:03Z
TLE epoch observation values (Epoch: 2026-05-23T20:03:53.684Z)
Latitude
24.98965°
Longitude
-81.32108°
Altitude
1,416.547 km
Speed
7.154 km/s
True Right ascension
06h 44m 23s
True Declination
24° 52' 10"
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
11:45:06
Azimuth
Unknown
Elevation
Unknown
Doppler factor
Unknown
Orbital elements
Apogee altitude
1,411.392 km
Perigee altitude
1,407.813 km
Semi-major axis
7,787.74 km
Eccentricity
0.00023
Inclination
82.6071°
RAAN
284.5494°
Arg. of periapsis
14.2282°
True anomaly
140.58452°
Mean anomaly
140.5678°
Eccentric anomaly
140.57616°
Mean motion
3.1581 °/min
Orbital period
113.99 mins
BSTAR
0.00015244
Loading maneuver chart data...
Computing Atmospheric mass density...
Loading historical data...
Loading historical data...
Loading historical data...
Loading historical data...
Loading historical data...
Loading historical data...
Loading historical data...
Other satellites on launch #77 in the year 1991 (1991-11-12 UTC)
Did you know?
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. |
|---|---|---|---|---|---|---|---|
| 12 mins | 2026-05-24 08:40:42.770Z | 129.781° SE | 2026-05-24 08:46:42.770Z | 79.131° E | 23.303° | 2026-05-24 08:52:42.770Z | 31.739° NE |
| 15 mins | 2026-05-24 10:33:42.770Z | 201.994° SSW | 2026-05-24 10:40:42.770Z | 280.591° WNW | 41.84° | 2026-05-24 10:48:42.770Z | 1.348° NNE |
| 14 mins | 2026-05-24 20:35:42.770Z | 5.659° NNE | 2026-05-24 20:41:42.770Z | 67.623° E | 38.665° | 2026-05-24 20:49:42.770Z | 152.166° SSE |
| 12 mins | 2026-05-24 22:30:42.770Z | 328.521° NNW | 2026-05-24 22:36:42.770Z | 274.897° WNW | 27.141° | 2026-05-24 22:42:42.770Z | 222.519° SW |
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 descending order |
|---|
CAUTION: Conjunctions in this section are generated from low-fidelity TLE screenings
Authenticating...
Click to sort rows by Secondary header in ascending order | Click to sort rows by Secondary name header in ascending order | Click to sort rows by Country header in ascending order | Click to sort rows by Owner header in ascending order | Click to sort rows by Obj. Type header in ascending order | Click to sort rows by Miss dist. header in ascending order | Click to sort rows by Rel. speed header in ascending order | Click to sort rows by Apr. angle header in ascending order | Click to sort rows by TCA header in descending order |
|---|