SL-8 DEB, 21251

Orbit data source: Space-Track

SL-8 DEB, 21251 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/21251?theme=dark&initialShowStats=false

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Identifier

21251, 1991-009BJ

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 21251U 91009BJ  26171.42379582  .00000075  00000-0  68167-3 0  9990
2 21251  73.9552 337.6632 0148408 181.6424 204.2649 12.36347033591717

Epoch: 2026-06-20T10:10Z

TLE epoch observation values (Epoch: 2026-06-20T10:10:15.958Z)

Latitude

24.20044°

Longitude

-76.15145°

Altitude

1,631.734 km

Speed

7.01 km/s

True Right ascension

23h 00m 12s

True Declination

24° 05' 10"

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

03:48:35

Azimuth

Unknown

Elevation

Unknown

Doppler factor

Unknown

Orbital elements

Apogee altitude

1,637.197 km

Perigee altitude

1,402.768 km

Semi-major axis

7,898.12 km

Eccentricity

0.01484

Inclination

73.9552°

RAAN

337.6632°

Arg. of periapsis

181.6424°

True anomaly

203.57766°

Mean anomaly

204.2649°

Eccentric anomaly

203.92013°

Mean motion

3.09213 °/min

Orbital period

116.42 mins

BSTAR

0.00068167

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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	2026-06-22 20:52:32.723Z	355.039° N	2026-06-22 21:00:32.723Z	62.623° ENE	29.394°	2026-06-22 21:07:32.723Z	120.541° SE
14 mins	2026-06-22 22:52:32.723Z	328.876° NNW	2026-06-22 22:59:32.723Z	254.973° W	38.515°	2026-06-22 23:06:32.723Z	187.561° SSW
9 mins	2026-06-23 10:01:32.723Z	118.016° SE	2026-06-23 10:05:32.723Z	89.412° E	17.57°	2026-06-23 10:10:32.723Z	54.564° ENE
16 mins	2026-06-23 11:55:32.723Z	196.1° SSW	2026-06-23 12:03:32.723Z	25.324° NE	44.886°	2026-06-23 12:11:32.723Z	19.395° NNE
12 mins	2026-06-23 13:57:32.723Z	266.098° W	2026-06-23 14:03:32.723Z	310.727° NW	21.243°	2026-06-23 14:09:32.723Z	354.912° N

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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, 21251 on other resources

View SL-8 DEB, 21251 on Heavens-Above

View SL-8 DEB, 21251 on Keep Track

View SL-8 DEB, 21251 on Celestrak

View SL-8 DEB, 21251 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, 21251

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: 2026-06-20T10:10:15.958Z)

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, 21251 on other resources

Documentation

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