SL-8 DEB, 21959

Orbit data source: Space-Track

SL-8 DEB, 21959 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 URL

https://www.satcat.com/sats-embedded/21959?theme=dark&initialShowStats=false

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ISO8601 Format

Identifier

21959, 1991-009CH

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

Small (<0.1 m²)

Expand to show TLE details & history
Last TLE update: 4 days ago

TLE from 4 days ago

0 SL-8 DEB
1 21959U 91009CH  26067.33490921 -.00000025  00000-0 -92129-4 0  9993
2 21959  73.9658 298.9514 0129431 233.8997 249.8016 12.18958131556123

Epoch: 2026-03-08T08:02Z

TLE epoch observation values (Epoch: 2026-03-08T08:02:16.155Z)

Latitude

54.41076°

Longitude

168.78396°

Altitude

1,642.454 km

Speed

7.04 km/s

True Right ascension

06h 21m 34s

True Declination

54° 15' 57"

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

12:08:44

Azimuth

Unknown

Elevation

Unknown

Doppler factor

Unknown

Orbital elements

Apogee altitude

1,698.155 km

Perigee altitude

1,491.762 km

Semi-major axis

7,973.095 km

Eccentricity

0.01294

Inclination

73.9658°

RAAN

298.9514°

Arg. of periapsis

233.8997°

True anomaly

248.41751°

Mean anomaly

249.8016°

Eccentric anomaly

249.10877°

Mean motion

3.04862 °/min

Orbital period

118.09 mins

BSTAR

-0.000092129

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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.
10 mins	2026-03-12 13:54:18.719Z	118.328° SE	2026-03-12 13:59:18.719Z	86.278° E	15.628°	2026-03-12 14:04:18.719Z	54.592° ENE
17 mins	2026-03-12 15:50:18.719Z	190.36° SSW	2026-03-12 15:58:18.719Z	101.631° ESE	44.648°	2026-03-12 16:07:18.719Z	21.368° NNE
14 mins	2026-03-12 17:53:18.719Z	258.938° W	2026-03-12 18:00:18.719Z	310.344° NW	24.224°	2026-03-12 18:07:18.719Z	359.532° N
13 mins	2026-03-13 00:13:18.719Z	3.472° NNE	2026-03-13 00:19:18.719Z	46.793° ENE	22.665°	2026-03-13 00:26:18.719Z	99.489° ESE
17 mins	2026-03-13 02:13:18.719Z	339.042° N	2026-03-13 02:21:18.719Z	284.317° WNW	44.714°	2026-03-13 02:30:18.719Z	167.586° S
7 mins	2026-03-13 04:17:18.719Z	296.047° NW	2026-03-13 04:20:18.719Z	275.236° WNW	15.054°	2026-03-13 04:24:18.719Z	247.252° 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, 21959 on other resources

View SL-8 DEB, 21959 on Heavens-Above

View SL-8 DEB, 21959 on Keep Track

View SL-8 DEB, 21959 on Celestrak

View SL-8 DEB, 21959 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, 21959

Orbit data source: Space-Track

Expand to show TLE details & historyLast TLE update: 4 days ago

TLE from 4 days ago

TLE epoch observation values (Epoch: 2026-03-08T08:02:16.155Z)

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, 21959 on other resources

Documentation

Expand to show TLE details & history
Last TLE update: 4 days ago