SL-8 DEB, 21136

Orbit data source: Space-Track

SL-8 DEB, 21136 is space debris in LEO originally from a launch on Tue, 12 Feb 1991 UTC launched from the Plesetsk Missile And Space Complex (PKMTR). Debris objects in space refer to the collection of defunct objects orbiting the Earth. Examples of debris include non-operational satellites, rocket bodies, and fragments generated from explosions, collisions, or faulty payload assembly.

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<iframe src="https://www.satcat.com/sats-embedded/21136?theme=dark&initialShowStats=false" width="600" height="400" frameborder="0" title="Kayhan Space Satcat Satellite Viewer"></iframe>

Iframe URL

https://www.satcat.com/sats-embedded/21136?theme=dark&initialShowStats=false

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ISO8601 Format

Identifier

21136, 1991-009N

Orbit

LEO

Country

CIS

Related business

Russian Strategic Rocket Forces (RU)

Manufacturer

Unknown

Mission

Spacecraft

Bus & Motor

Unknown

Mass

Unknown

Launch date (UTC)

1991-02-12 (35 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: 14 hours ago

TLE from 14 hours ago

0 SL-8 DEB
1 21136U 91009N   26070.82966154  .00000044  00000-0  65493-3 0  9996
2 21136  73.9955 237.2851 0288176 183.1734 297.2418 11.97324721532178

Epoch: 2026-03-11T19:54Z

TLE epoch observation values (Epoch: 2026-03-11T19:54:42.757Z)

Latitude

58.65354°

Longitude

-78.82541°

Altitude

1,601.305 km

Speed

7.119 km/s

True Right ascension

01h 57m 21s

True Declination

58° 31' 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

13:56:27

Azimuth

Unknown

Elevation

Unknown

Doppler factor

Unknown

Orbital elements

Apogee altitude

1,923.283 km

Perigee altitude

1,458.231 km

Semi-major axis

8,068.894 km

Eccentricity

0.02882

Inclination

73.9955°

RAAN

237.2851°

Arg. of periapsis

183.1734°

True anomaly

294.25799°

Mean anomaly

297.2418°

Eccentric anomaly

295.75469°

Mean motion

2.99449 °/min

Orbital period

120.22 mins

BSTAR

0.00065493

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Other satellites on launch #9 in the year 1991 (1991-02-12 UTC)

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SL-8 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.
19 mins	2026-03-12 11:20:43.292Z	171.386° S	2026-03-12 11:30:43.292Z	101.499° ESE	38.617°	2026-03-12 11:39:43.292Z	29.795° NE
18 mins	2026-03-12 13:24:43.292Z	233.206° WSW	2026-03-12 13:33:43.292Z	297.455° NW	34.253°	2026-03-12 13:42:43.292Z	6.711° NNE
9 mins	2026-03-12 19:55:43.292Z	12.887° NNE	2026-03-12 19:59:43.292Z	40.718° NE	15.821°	2026-03-12 20:04:43.292Z	76.377° E
16 mins	2026-03-12 21:56:43.292Z	345.489° N	2026-03-12 22:04:43.292Z	60.117° ENE	43.289°	2026-03-12 22:12:43.292Z	151.193° SSE
11 mins	2026-03-13 00:01:43.292Z	308.068° NW	2026-03-13 00:06:43.292Z	268.11° W	21.537°	2026-03-13 00:12:43.292Z	222.457° SW

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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 SL-8 DEB, 21136 on other resources

View SL-8 DEB, 21136 on Heavens-Above

View SL-8 DEB, 21136 on Keep Track

View SL-8 DEB, 21136 on Celestrak

View SL-8 DEB, 21136 on Gunter's Space Page

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

SL-8 DEB, 21136

Orbit data source: Space-Track

Expand to show TLE details & historyLast TLE update: 14 hours ago

TLE from 14 hours ago

TLE epoch observation values (Epoch: 2026-03-11T19:54:42.757Z)

Visualization orbit readout

Visualization observer readout

Orbital elements

Other satellites on launch #9 in the year 1991 (1991-02-12 UTC)

SL-8 DEB Visibility forecast

Co-orbital & Co-planar RSOs

Check out SL-8 DEB, 21136 on other resources

Documentation

Expand to show TLE details & history
Last TLE update: 14 hours ago