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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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

Medium (>0.1 m² and <1 m²)

Expand to show TLE details & history
Last TLE update: 16 hours ago

TLE from 16 hours ago

0 SL-8 DEB
1 21136U 91009N   26171.25867049  .00000216  00000-0  25968-2 0  9991
2 21136  73.9970 116.1555 0286902  47.1284 103.7983 11.97331278544193

Epoch: 2026-06-20T06:12Z

TLE epoch observation values (Epoch: 2026-06-20T06:12:29.130Z)

Latitude

24.86514°

Longitude

-73.04349°

Altitude

1,756.731 km

Speed

6.977 km/s

True Right ascension

19h 14m 12s

True Declination

24° 45' 01"

Sunlit

Object was in partial 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

08:46:34

Azimuth

Unknown

Elevation

Unknown

Doppler factor

Unknown

Orbital elements

Apogee altitude

1,922.225 km

Perigee altitude

1,459.23 km

Semi-major axis

8,068.864 km

Eccentricity

0.02869

Inclination

73.997°

RAAN

116.1555°

Arg. of periapsis

47.1284°

True anomaly

106.96238°

Mean anomaly

103.7983°

Eccentric anomaly

105.38323°

Mean motion

2.9945 °/min

Orbital period

120.22 mins

BSTAR

0.0025968

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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.
12 mins	2026-06-20 23:36:34.163Z	265.33° W	2026-06-20 23:42:34.163Z	310.798° NW	19.295°	2026-06-20 23:48:34.163Z	355.843° N
14 mins	2026-06-21 06:01:34.163Z	3.604° NNE	2026-06-21 06:08:34.163Z	61.403° ENE	26.626°	2026-06-21 06:15:34.163Z	110.826° ESE
18 mins	2026-06-21 08:03:34.163Z	334.679° NNW	2026-06-21 08:11:34.163Z	254.458° W	43.02°	2026-06-21 08:21:34.163Z	176.035° S
4 mins	2026-06-21 10:11:34.163Z	280.78° WNW	2026-06-21 10:12:34.163Z	274.495° WNW	11.61°	2026-06-21 10:15:34.163Z	256.387° W
9 mins	2026-06-21 19:36:34.163Z	123.305° SE	2026-06-21 19:40:34.163Z	92.491° ESE	17.676°	2026-06-21 19:45:34.163Z	54.111° ENE
15 mins	2026-06-21 21:35:34.163Z	203.14° SW	2026-06-21 21:42:34.163Z	305.368° NW	44.553°	2026-06-21 21:50:34.163Z	17.118° NNE

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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: 16 hours ago

TLE from 16 hours ago

TLE epoch observation values (Epoch: 2026-06-20T06:12:29.130Z)

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: 16 hours ago