SL-8 DEB, 21186

Orbit data source: Space-Track

SL-8 DEB, 21186 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/21186?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/21186?theme=dark&initialShowStats=false

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ISO8601 Format

Identifier

21186, 1991-009AZ

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: 15 hours ago

TLE from 15 hours ago

0 SL-8 DEB
1 21186U 91009AZ  26171.28941176  .00000133  00000-0  14910-2 0  9996
2 21186  74.1027 105.5610 0148233 101.1308  52.6469 12.13111536562384

Epoch: 2026-06-20T06:56Z

TLE epoch observation values (Epoch: 2026-06-20T06:56:45.176Z)

Latitude

23.87268°

Longitude

-94.33914°

Altitude

1,554.205 km

Speed

7.123 km/s

True Right ascension

18h 33m 25s

True Declination

23° 45' 30"

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

08:46:34

Azimuth

Unknown

Elevation

Unknown

Doppler factor

Unknown

Orbital elements

Apogee altitude

1,739.125 km

Perigee altitude

1,501.991 km

Semi-major axis

7,998.695 km

Eccentricity

0.01482

Inclination

74.1027°

RAAN

105.561°

Arg. of periapsis

101.1308°

True anomaly

54.01237°

Mean anomaly

52.6469°

Eccentric anomaly

53.32811°

Mean motion

3.03399 °/min

Orbital period

118.66 mins

BSTAR

0.001491

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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.
15 mins	2026-06-20 22:04:34.726Z	237.072° WSW	2026-06-20 22:12:34.726Z	306.647° NW	31.515°	2026-06-20 22:19:34.726Z	3.864° NNE
7 mins	2026-06-21 04:29:34.726Z	23.46° NE	2026-06-21 04:32:34.726Z	45.366° ENE	14.019°	2026-06-21 04:36:34.726Z	73.024° E
15 mins	2026-06-21 06:28:34.726Z	349.437° N	2026-06-21 06:35:34.726Z	69.26° E	42.055°	2026-06-21 06:43:34.726Z	147.418° SSE
12 mins	2026-06-21 08:30:34.726Z	311.271° NW	2026-06-21 08:35:34.726Z	270.325° WNW	24.375°	2026-06-21 08:42:34.726Z	216.078° SW
15 mins	2026-06-21 19:48:34.726Z	163.835° S	2026-06-21 19:55:34.726Z	99.463° ESE	35.834°	2026-06-21 20:03:34.726Z	31.281° NE

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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, 21186 on other resources

View SL-8 DEB, 21186 on Heavens-Above

View SL-8 DEB, 21186 on Keep Track

View SL-8 DEB, 21186 on Celestrak

View SL-8 DEB, 21186 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, 21186

Orbit data source: Space-Track

Expand to show TLE details & historyLast TLE update: 15 hours ago

TLE from 15 hours ago

TLE epoch observation values (Epoch: 2026-06-20T06:56:45.176Z)

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, 21186 on other resources

Documentation

Expand to show TLE details & history
Last TLE update: 15 hours ago