COSMOS 2143, 21299
Orbit data source: Space-Track
COSMOS 2143, 21299 is a payload satellite owned by UNKS RF (CIS) in LEO that was launched on Thu, 16 May 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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21299 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, Large (>1 m²)
Expand to show TLE details & historyLast TLE update: 20 hours ago
TLE from 20 hours ago
0 COSMOS 2143
1 21299U 91033A 25273.05093427 .00000033 00000-0 12468-3 0 9998
2 21299 82.5701 109.3469 0012165 285.5875 243.7896 12.63920875585702Epoch: 2025-09-30T01:13Z
TLE epoch observation values (Epoch: 2025-09-30T01:13:20.720Z)
Latitude
10.60886°
Longitude
-99.42803°
Altitude
1,412.982 km
Speed
7.153 km/s
True Right ascension
19h 11m 48s
True Declination
10° 33' 07"
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
14:47:20
Azimuth
Unknown
Elevation
Unknown
Doppler factor
Unknown
Orbital elements
Apogee altitude
1,413.588 km
Perigee altitude
1,394.654 km
Semi-major axis
7,782.258 km
Eccentricity
0.00122
Inclination
82.5701°
RAAN
109.3469°
Arg. of periapsis
285.5875°
True anomaly
243.66462°
Mean anomaly
243.7896°
Eccentric anomaly
243.7271°
Mean motion
3.16144 °/min
Orbital period
113.87 mins
BSTAR
0.00012468
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Other satellites on launch #33 in the year 1991 (1991-05-16 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 2143 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. |
|---|---|---|---|---|---|---|---|
| 13 mins | 2025-09-30 23:44:21.191Z | 14.493° NNE | 2025-09-30 23:50:21.191Z | 65.74° ENE | 26.796° | 2025-09-30 23:57:21.191Z | 127.139° SE |
| 14 mins | 2025-10-01 01:39:21.191Z | 340.836° N | 2025-10-01 01:46:21.191Z | 258.834° W | 39.367° | 2025-10-01 01:53:21.191Z | 196.004° SSW |
| 11 mins | 2025-10-01 12:33:21.191Z | 129.491° SE | 2025-10-01 12:38:21.191Z | 82.007° E | 26.142° | 2025-10-01 12:44:21.191Z | 31.062° NE |
| 14 mins | 2025-10-01 14:26:21.191Z | 209.753° SW | 2025-10-01 14:32:21.191Z | 276.73° WNW | 39.628° | 2025-10-01 14:40:21.191Z | 358.978° 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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