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

Small (<0.1 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  26069.58034072  .00000352  00000-0  27889-2 0  9998
2 21251  73.9512 110.2538 0148439 329.7597 158.4399 12.36329296579127

Epoch: 2026-03-10T13:55Z

TLE epoch observation values (Epoch: 2026-03-10T13:55:41.438Z)

Latitude

48.58225°

Longitude

-105.86256°

Altitude

1,638.707 km

Speed

7.008 km/s

True Right ascension

18h 05m 16s

True Declination

48° 25' 49"

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

10:36:03

Azimuth

Unknown

Elevation

Unknown

Doppler factor

Unknown

Orbital elements

Apogee altitude

1,637.298 km

Perigee altitude

1,402.818 km

Semi-major axis

7,898.195 km

Eccentricity

0.01484

Inclination

73.9512°

RAAN

110.2538°

Arg. of periapsis

329.7597°

True anomaly

159.05435°

Mean anomaly

158.4399°

Eccentric anomaly

158.74818°

Mean motion

3.09208 °/min

Orbital period

116.43 mins

BSTAR

0.0027889

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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.
7 mins	2026-03-12 06:16:52.380Z	300.638° NW	2026-03-12 06:18:52.380Z	315.464° NNW	14.716°	2026-03-12 06:23:52.380Z	349.946° N
15 mins	2026-03-12 12:25:52.380Z	359.55° N	2026-03-12 12:32:52.380Z	57.967° ENE	30.457°	2026-03-12 12:40:52.380Z	119.955° SE
16 mins	2026-03-12 14:24:52.380Z	330.355° NNW	2026-03-12 14:31:52.380Z	266.924° W	40.388°	2026-03-12 14:40:52.380Z	183.702° SSW
7 mins	2026-03-13 01:34:52.380Z	111.675° ESE	2026-03-13 01:37:52.380Z	89.49° E	14.934°	2026-03-13 01:41:52.380Z	60.541° ENE
15 mins	2026-03-13 03:28:52.380Z	193.578° SSW	2026-03-13 03:35:52.380Z	56.129° ENE	44.754°	2026-03-13 03:43:52.380Z	20.374° NNE
11 mins	2026-03-13 05:30:52.380Z	270.561° WNW	2026-03-13 05:35:52.380Z	311.854° NW	21.324°	2026-03-13 05:41:52.380Z	356.319° 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: 2026-03-10T13:55:41.438Z)

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