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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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Iframe URL

https://www.satcat.com/sats-embedded/21299?theme=dark&initialShowStats=false

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ISO8601 Format

Identifier

21299, 1991-033A

Orbit

LEO

Last TLE update

9 hours ago

Origin

Russian Space Forces (CIS)

Manufacturer

NPO PM

Mission

Defense Communications

Bus & Motor

STRELA-3, Unknown motor

Mass

225 kg wet, 225 kg dry

Launch date (UTC)

1991-05-16 (34 years ago)

Launch vehicle

TSIKLON-3

Launch site

Plesetsk Missile And Space Complex (PKMTR)

Object type

Payload

Rocket body

Debris

Shape & HBR

Cyl, 0.8 m

Radar Cross Section

1.257 m², Large (>1 m²)

Expand to show TLE details & history

TLE from 9 hours ago

0 COSMOS 2143
1 21299U 91033A   25198.39304573  .00000031  00000-0  11294-3 0  9992
2 21299  82.5758 157.1406 0014275  92.2870  25.1505 12.63918385576272

Epoch: 2025-07-17T09:25Z

TLE epoch observation values (Epoch: 2025-07-17T09:25:59.151Z)

Latitude

61.67058°

Longitude

-113.73222°

Altitude

1,407.27 km

Speed

7.167 km/s

True Right ascension

21h 32m 53s

True Declination

61° 32' 19"

Sunlit

Object was in daylight at epoch

Visualization orbit readout

Latitude

12.1449°

Longitude

81.54505°

Altitude

1,406.688 km

Speed

7.159 km/s

Apparent Right ascension

13h 14m 06s

Apparent Declination

-22° 06' 17"

Sunlit

Object is in daylight

Visualization observer readout

Local Sidereal Time

07:05:31

Azimuth

106.049° ESE

Elevation

-15.55°

Doppler factor

Orbital elements

Apogee altitude

1,415.241 km

Perigee altitude

1,393.022 km

Semi-major axis

7,782.268 km

Eccentricity

0.00143

Inclination

82.5758°

RAAN

157.1406°

Arg. of periapsis

92.287°

True anomaly

Unknown

Mean anomaly

25.1505°

Eccentric anomaly

Unknown

Mean motion

3.16143 °/min

Orbital period

113.87 mins

BSTAR

0.00011294

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Other satellites on launch #33 in the year 1991 (1991-05-16 UTC)

COSMOS 2143 DEB, 57720

COSMOS 2143 DEB, 57721

COSMOS 2143 DEB, 57722

COSMOS 2143 DEB, 57723

COSMOS 2143 DEB, 57724

COSMOS 2143 DEB, 57725

COSMOS 2143 Visibility forecast

Observer location: undefined°, undefined°

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.
10 mins	2025-07-17 20:20:41.079Z	119.316° SE	2025-07-17 20:25:41.079Z	80.251° E	18.585°	2025-07-17 20:30:41.079Z	40.603° NE
15 mins	2025-07-17 22:12:41.079Z	192.21° SSW	2025-07-17 22:19:41.079Z	284.542° WNW	44.427°	2025-07-17 22:27:41.079Z	5.178° NNE
6 mins	2025-07-18 00:13:41.079Z	281.468° WNW	2025-07-18 00:15:41.079Z	297.202° NW	14.203°	2025-07-18 00:19:41.079Z	327.554° NNW
14 mins	2025-07-18 08:13:41.079Z	9.293° NNE	2025-07-18 08:20:41.079Z	82.788° E	33.738°	2025-07-18 08:27:41.079Z	142.867° SSE
13 mins	2025-07-18 10:08:41.079Z	333.497° NNW	2025-07-18 10:14:41.079Z	277.19° WNW	32.222°	2025-07-18 10:21:41.079Z	210.966° SW

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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Check out COSMOS 2143, 21299 on other resources

View COSMOS 2143, 21299 on NASA - NSSDCA Website

View COSMOS 2143, 21299 on Heavens-Above

View COSMOS 2143, 21299 on Keep Track

View COSMOS 2143, 21299 on Celestrak

View COSMOS 2143, 21299 on Gunter's Space Page

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