SL-8 DEB, 21166

Orbit data source: Space-Track

SL-8 DEB, 21166 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/21166?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/21166?theme=dark&initialShowStats=false

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ISO8601 Format

Identifier

21166, 1991-009AD

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, 0.4 m

Radar Cross Section

Medium (>0.1 m² and <1 m²)

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

TLE from 2 days ago

0 SL-8 DEB
1 21166U 91009AD  26171.45851214  .00000030  00000-0  42787-3 0  9996
2 21166  74.0617 232.9617 0122563 286.5413  83.2900 12.19243158570731

Epoch: 2026-06-20T11:00Z

TLE epoch observation values (Epoch: 2026-06-20T11:00:15.448Z)

Latitude

10.75167°

Longitude

162.31796°

Altitude

1,587.202 km

Speed

7.081 km/s

True Right ascension

15h 44m 13s

True Declination

10° 41' 43"

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

02:30:11

Azimuth

Unknown

Elevation

Unknown

Doppler factor

Unknown

Orbital elements

Apogee altitude

1,691.413 km

Perigee altitude

1,496.002 km

Semi-major axis

7,971.845 km

Eccentricity

0.01226

Inclination

74.0617°

RAAN

232.9617°

Arg. of periapsis

286.5413°

True anomaly

84.68721°

Mean anomaly

83.29°

Eccentric anomaly

83.98837°

Mean motion

3.04933 °/min

Orbital period

118.06 mins

BSTAR

0.00042787

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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.
14 mins	2026-06-22 16:46:20.931Z	319.07° NNW	2026-06-22 16:53:20.931Z	269.18° W	26.102°	2026-06-22 17:00:20.931Z	216.357° SW
15 mins	2026-06-23 04:01:20.931Z	160.042° S	2026-06-23 04:08:20.931Z	96.906° ESE	34.77°	2026-06-23 04:16:20.931Z	32.766° NE
16 mins	2026-06-23 06:01:20.931Z	231.36° WSW	2026-06-23 06:08:20.931Z	290.982° WNW	35.581°	2026-06-23 06:17:20.931Z	8.113° NNE
4 mins	2026-06-23 08:11:20.931Z	317.131° NNW	2026-06-23 08:12:20.931Z	323.397° NNW	11.123°	2026-06-23 08:15:20.931Z	341.911° N
8 mins	2026-06-23 12:24:20.931Z	17.063° NNE	2026-06-23 12:27:20.931Z	36.328° NE	13.881°	2026-06-23 12:32:20.931Z	68.154° E
17 mins	2026-06-23 14:23:20.931Z	351.365° N	2026-06-23 14:31:20.931Z	70.312° E	39.84°	2026-06-23 14:40:20.931Z	142.09° SSE

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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, 21166 on other resources

View SL-8 DEB, 21166 on Heavens-Above

View SL-8 DEB, 21166 on Keep Track

View SL-8 DEB, 21166 on Celestrak

View SL-8 DEB, 21166 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, 21166

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: 2026-06-20T11:00:15.448Z)

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, 21166 on other resources

Documentation

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