SL-8 DEB, 21256

Orbit data source: Space-Track

SL-8 DEB, 21256 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/21256?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/21256?theme=dark&initialShowStats=false

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ISO8601 Format

Identifier

21256, 1991-009BN

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, 0.2 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 21256U 91009BN  26171.33633344  .00000042  00000-0  76332-3 0  9991
2 21256  73.9758 129.0288 0246183 195.7838 319.4921 11.84172443521712

Epoch: 2026-06-20T08:04Z

TLE epoch observation values (Epoch: 2026-06-20T08:04:19.209Z)

Latitude

25.52527°

Longitude

-88.44779°

Altitude

1,604.981 km

Speed

7.134 km/s

True Right ascension

20h 04m 44s

True Declination

25° 24' 22"

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

00:51:04

Azimuth

Unknown

Elevation

Unknown

Doppler factor

Unknown

Orbital elements

Apogee altitude

1,950.538 km

Perigee altitude

1,550.315 km

Semi-major axis

8,128.563 km

Eccentricity

0.02462

Inclination

73.9758°

RAAN

129.0288°

Arg. of periapsis

195.7838°

True anomaly

317.61616°

Mean anomaly

319.4921°

Eccentric anomaly

318.55854°

Mean motion

2.96157 °/min

Orbital period

121.56 mins

BSTAR

0.00076332

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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 20:07:30.527Z	130.347° SE	2026-06-22 20:14:30.527Z	88.879° E	20.313°	2026-06-22 20:21:30.527Z	46.668° ENE
20 mins	2026-06-22 22:07:30.527Z	197.029° SSW	2026-06-22 22:17:30.527Z	325.704° NNW	44.984°	2026-06-22 22:27:30.527Z	19.013° NNE
14 mins	2026-06-23 00:16:30.527Z	266.659° W	2026-06-23 00:23:30.527Z	312.665° NW	22.829°	2026-06-23 00:30:30.527Z	358.073° N
15 mins	2026-06-23 06:46:30.527Z	356.534° N	2026-06-23 06:54:30.527Z	58.639° ENE	29.44°	2026-06-23 07:01:30.527Z	114.895° SE
16 mins	2026-06-23 08:51:30.527Z	330.64° NNW	2026-06-23 08:58:30.527Z	270.077° WNW	40.157°	2026-06-23 09:07:30.527Z	183.728° SSW

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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, 21256 on other resources

View SL-8 DEB, 21256 on Heavens-Above

View SL-8 DEB, 21256 on Keep Track

View SL-8 DEB, 21256 on Celestrak

View SL-8 DEB, 21256 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, 21256

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: 2026-06-20T08:04:19.209Z)

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, 21256 on other resources

Documentation

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