COSMOS 2251 DEB, 35661

Orbit data source: Space-Track

COSMOS 2251 DEB, 35661 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

35661, 1993-036APC

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)

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

TLE from 2 days ago

0 COSMOS 2251 DEB
1 35661U 93036APC 26173.96228752  .00004837  00000-0  48354-3 0  9991
2 35661  74.0122  55.7052 0084450 110.5210 250.5060 14.89080704907278

Epoch: 2026-06-22T23:05Z

TLE epoch observation values (Epoch: 2026-06-22T23:05:41.641Z)

Latitude

-0.00002°

Longitude

158.14101°

Altitude

623.593 km

Speed

7.536 km/s

True Right ascension

03h 42m 49s

True Declination

0° 00' 00"

Sunlit

Object was in daylight 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

03:15:24

Azimuth

Unknown

Elevation

Unknown

Doppler factor

Unknown

Orbital elements

Apogee altitude

657.291 km

Perigee altitude

539.457 km

Semi-major axis

6,976.511 km

Eccentricity

0.00845

Inclination

74.0122°

RAAN

55.7052°

Arg. of periapsis

110.521°

True anomaly

249.59699°

Mean anomaly

250.506°

Eccentric anomaly

250.05117°

Mean motion

3.72465 °/min

Orbital period

96.65 mins

BSTAR

0.00048354

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

COSMOS 2251 DEB, 33942

COSMOS 2251 DEB, 38193 (Decayed)

COSMOS 2251 DEB, 35673 (Decayed)

COSMOS 2251 DEB, 34624 (Decayed)

COSMOS 2251 DEB, 36475 (Decayed)

COSMOS 2251 DEB, 34133 (Decayed)

COSMOS 2251 DEB, 37512 (Decayed)

COSMOS 2251 DEB, 35766 (Decayed)

COSMOS 2251 DEB, 34285 (Decayed)

COSMOS 2251 DEB, 47054 (Decayed)

COSMOS 2251 DEB, 37488 (Decayed)

COSMOS 2251 DEB, 36452 (Decayed)

SL-8 DEB, 23007

COSMOS 2251 DEB, 34626

COSMOS 2251 DEB, 34041 (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.
7 mins	2026-06-24 17:08:34.984Z	196.88° SSW	2026-06-24 17:12:34.984Z	25.174° NE	43.98°	2026-06-24 17:15:34.984Z	19.39° NNE
6 mins	2026-06-25 03:15:34.984Z	340.588° N	2026-06-25 03:18:34.984Z	168.172° S	43.801°	2026-06-25 03:21:34.984Z	163.051° S

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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, 35661 on other resources

View COSMOS 2251 DEB, 35661 on Heavens-Above

View COSMOS 2251 DEB, 35661 on Keep Track

View COSMOS 2251 DEB, 35661 on Celestrak

View COSMOS 2251 DEB, 35661 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, 35661

Orbit data source: Space-Track

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

TLE from 2 days ago

TLE epoch observation values (Epoch: 2026-06-22T23:05:41.641Z)

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, 35661 on other resources

Documentation

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