COSMOS 2251 DEB, 35721

Orbit data source: Space-Track

COSMOS 2251 DEB, 35721 is space debris in LEO originally from a launch on Wed, 16 Jun 1993 UTC launched from the Plesetsk Missile And Space Complex (PKMTR). The debris from Iridium 33, an American commercial communications satellite, has been tracked extensively since its accidental collision with the defunct Russian satellite Cosmos 2251 in 2009. This event, occurring at high speed in low Earth orbit (LEO), generated thousands of pieces of space debris, significantly increasing the risk of further collisions. The Iridium 33 debris cloud has impacted space traffic management and orbital debris mitigation strategies, making it a subject of ongoing study in space situational awareness.

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Identifier

35721, 1993-036AQS

Orbit

LEO

Country

CIS

Related business

Russian Space Forces (RU)

Manufacturer

Unknown

Mission

Spacecraft

Bus & Motor

Unknown

Mass

Unknown

Launch date (UTC)

1993-06-16 (33 years ago)

Launch vehicle

Unknown

Launch site

Plesetsk Missile And Space Complex (PKMTR)

Object type

Payload

Rocket body

Debris

Shape & HBR

Unknown shape, 0.1 m

Radar Cross Section

Small (<0.1 m²)

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Last TLE update: 2 months ago

TLE from 2 months ago

0 COSMOS 2251 DEB
1 35721U 93036AQS 26034.39353527  .00004972  00000-0  15516-2 0  9993
2 35721  73.9485  80.7361 0147322 217.0798 142.0107 14.35018184585440

Epoch: 2026-02-03T09:26Z

TLE epoch observation values (Epoch: 2026-02-03T09:26:41.447Z)

Latitude

-0.00002°

Longitude

165.48829°

Altitude

861.256 km

Speed

7.379 km/s

True Right ascension

05h 22m 56s

True Declination

0° 00' 00"

Sunlit

Object was in full shadow at epoch

Visualization orbit readout

Latitude

Unknown

Longitude

Unknown

Altitude

Unknown

Speed

Unknown

Apparent Right ascension

Unknown

Apparent Declination

Unknown

Sunlit

N/A

Visualization observer readout

Local Sidereal Time

03:58:12

Azimuth

Unknown

Elevation

Unknown

Doppler factor

Unknown

Orbital elements

Apogee altitude

877.984 km

Perigee altitude

667.291 km

Semi-major axis

7,150.775 km

Eccentricity

0.01473

Inclination

73.9485°

RAAN

80.7361°

Arg. of periapsis

217.0798°

True anomaly

143.03487°

Mean anomaly

142.0107°

Eccentric anomaly

142.52427°

Mean motion

3.58933 °/min

Orbital period

100.3 mins

BSTAR

0.0015516

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Other satellites on launch #36 in the year 1993 (1993-06-16 UTC)

COSMOS 2251 DEB, 36427 (Decayed)

COSMOS 2251 DEB, 35710 (Decayed)

COSMOS 2251 DEB, 35994 (Decayed)

COSMOS 2251 DEB, 34562 (Decayed)

COSMOS 2251 DEB, 34322 (Decayed)

COSMOS 2251 DEB, 33935 (Decayed)

COSMOS 2251 DEB, 34751 (Decayed)

COSMOS 2251 DEB, 37979 (Decayed)

COSMOS 2251 DEB, 37504 (Decayed)

COSMOS 2251 DEB, 37995 (Decayed)

COSMOS 2251 DEB, 35069 (Decayed)

COSMOS 2251 DEB, 34916 (Decayed)

COSMOS 2251 DEB, 35673 (Decayed)

COSMOS 2251 DEB, 35889 (Decayed)

COSMOS 2251 DEB, 34853 (Decayed)

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COSMOS 2251 DEB 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.
6 mins	2026-03-22 04:29:47.466Z	18.885° NNE	2026-03-22 04:32:47.466Z	62.92° ENE	18.007°	2026-03-22 04:35:47.466Z	103.886° ESE
7 mins	2026-03-22 06:11:47.466Z	319.848° NNW	2026-03-22 06:14:47.466Z	261.861° W	33.716°	2026-03-22 06:18:47.466Z	189.31° SSW
8 mins	2026-03-22 19:06:47.466Z	182.611° SSW	2026-03-22 19:10:47.466Z	107.231° ESE	41.475°	2026-03-22 19:14:47.466Z	28.371° NE
4 mins	2026-03-22 20:51:47.466Z	280.979° WNW	2026-03-22 20:53:47.466Z	308.305° NW	15.281°	2026-03-22 20:55:47.466Z	333.946° NNW

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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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Check out COSMOS 2251 DEB, 35721 on other resources

View COSMOS 2251 DEB, 35721 on Heavens-Above

View COSMOS 2251 DEB, 35721 on Keep Track

View COSMOS 2251 DEB, 35721 on Celestrak

View COSMOS 2251 DEB, 35721 on Gunter's Space Page

Satcat and Kayhan Space are not affiliated with NASA, Celestrak, Heavens-Above, Keep Track, or Gunter's Space Page.

COSMOS 2251 DEB, 35721

Orbit data source: Space-Track

Expand to show TLE details & historyLast TLE update: 2 months ago

TLE from 2 months ago

TLE epoch observation values (Epoch: 2026-02-03T09:26:41.447Z)

Visualization orbit readout

Visualization observer readout

Orbital elements

Other satellites on launch #36 in the year 1993 (1993-06-16 UTC)

COSMOS 2251 DEB Visibility forecast

Co-orbital & Co-planar RSOs

Check out COSMOS 2251 DEB, 35721 on other resources

Documentation

Expand to show TLE details & history
Last TLE update: 2 months ago