SL-8 DEB, 21918

Orbit data source: Space-Track

SL-8 DEB, 21918 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/21918?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/21918?theme=dark&initialShowStats=false

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ISO8601 Format

Identifier

21918, 1991-009CB

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: 2 days ago

TLE from 2 days ago

0 SL-8 DEB
1 21918U 91009CB  26171.28992350  .00000067  00000-0  74828-3 0  9990
2 21918  74.0787 180.7417 0121272 179.9111 314.3453 12.22334184572623

Epoch: 2026-06-20T06:57Z

TLE epoch observation values (Epoch: 2026-06-20T06:57:29.390Z)

Latitude

44.55131°

Longitude

-28.36503°

Altitude

1,521.759 km

Speed

7.139 km/s

True Right ascension

22h 58m 03s

True Declination

44° 23' 46"

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

02:30:10

Azimuth

Unknown

Elevation

Unknown

Doppler factor

Unknown

Orbital elements

Apogee altitude

1,676.767 km

Perigee altitude

1,483.741 km

Semi-major axis

7,958.391 km

Eccentricity

0.01213

Inclination

74.0787°

RAAN

180.7417°

Arg. of periapsis

179.9111°

True anomaly

313.3409°

Mean anomaly

314.3453°

Eccentric anomaly

313.84416°

Mean motion

3.05707 °/min

Orbital period

117.76 mins

BSTAR

0.00074828

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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.
4 mins	2026-06-22 23:13:20.685Z	98.051° ESE	2026-06-22 23:15:20.685Z	85.47° E	11.414°	2026-06-22 23:17:20.685Z	72.773° E
17 mins	2026-06-23 01:05:20.685Z	182.237° SSW	2026-06-23 01:14:20.685Z	87.27° E	42.651°	2026-06-23 01:22:20.685Z	24.778° NE
14 mins	2026-06-23 03:08:20.685Z	252.302° W	2026-06-23 03:14:20.685Z	298.822° NW	27.098°	2026-06-23 03:22:20.685Z	1.33° NNE
10 mins	2026-06-23 09:28:20.685Z	12.77° NNE	2026-06-23 09:33:20.685Z	50.476° ENE	17.685°	2026-06-23 09:38:20.685Z	86.557° E
16 mins	2026-06-23 11:27:20.685Z	343.889° N	2026-06-23 11:34:20.685Z	34.438° NE	44.324°	2026-06-23 11:43:20.685Z	157.862° S
10 mins	2026-06-23 13:29:20.685Z	304.871° NW	2026-06-23 13:34:20.685Z	265.855° W	18.959°	2026-06-23 13:39:20.685Z	229.322° WSW

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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, 21918 on other resources

View SL-8 DEB, 21918 on Heavens-Above

View SL-8 DEB, 21918 on Keep Track

View SL-8 DEB, 21918 on Celestrak

View SL-8 DEB, 21918 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, 21918

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: 2026-06-20T06:57:29.390Z)

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, 21918 on other resources

Documentation

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