SL-8 DEB, 21172

Orbit data source: Space-Track

SL-8 DEB, 21172 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/21172?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/21172?theme=dark&initialShowStats=false

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ISO8601 Format

Identifier

21172, 1991-009AK

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, 0.3 m

Radar Cross Section

Medium (>0.1 m² and <1 m²)

Expand to show TLE details & history
Last TLE update: 11 hours ago

TLE from 11 hours ago

0 SL-8 DEB
1 21172U 91009AK  26071.25794749 -.00000001  00000-0  11682-3 0  9998
2 21172  74.0318  67.0503 0133111 145.1647 227.6981 12.27722843569358

Epoch: 2026-03-12T06:11Z

TLE epoch observation values (Epoch: 2026-03-12T06:11:26.663Z)

Latitude

11.25032°

Longitude

167.52608°

Altitude

1,632.563 km

Speed

7.024 km/s

True Right ascension

04h 41m 11s

True Declination

11° 11' 31"

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

21:49:41

Azimuth

Unknown

Elevation

Unknown

Doppler factor

Unknown

Orbital elements

Apogee altitude

1,662.565 km

Perigee altitude

1,451.316 km

Semi-major axis

7,935.078 km

Eccentricity

0.01331

Inclination

74.0318°

RAAN

67.0503°

Arg. of periapsis

145.1647°

True anomaly

226.58252°

Mean anomaly

227.6981°

Eccentric anomaly

227.13906°

Mean motion

3.07055 °/min

Orbital period

117.24 mins

BSTAR

0.00011682

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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.
16 mins	2026-03-12 23:48:40.505Z	162.545° S	2026-03-12 23:56:40.505Z	95.105° ESE	34.073°	2026-03-13 00:04:40.505Z	32.236° NE
15 mins	2026-03-13 01:48:40.505Z	230.308° WSW	2026-03-13 01:55:40.505Z	290.408° WNW	35.489°	2026-03-13 02:03:40.505Z	6.072° NNE
15 mins	2026-03-13 10:06:40.505Z	353.086° N	2026-03-13 10:13:40.505Z	61.505° ENE	37.219°	2026-03-13 10:21:40.505Z	136.721° SSE
13 mins	2026-03-13 12:06:40.505Z	320.837° NNW	2026-03-13 12:12:40.505Z	269.936° W	29.843°	2026-03-13 12:19:40.505Z	205.768° 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, 21172 on other resources

View SL-8 DEB, 21172 on Heavens-Above

View SL-8 DEB, 21172 on Keep Track

View SL-8 DEB, 21172 on Celestrak

View SL-8 DEB, 21172 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, 21172

Orbit data source: Space-Track

Expand to show TLE details & historyLast TLE update: 11 hours ago

TLE from 11 hours ago

TLE epoch observation values (Epoch: 2026-03-12T06:11:26.663Z)

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, 21172 on other resources

Documentation

Expand to show TLE details & history
Last TLE update: 11 hours ago