SL-8 DEB, 21403

Orbit data source: Space-Track

SL-8 DEB, 21403 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/21403?theme=dark&initialShowStats=false" width="600" height="400" frameborder="0" title="Kayhan Space Satcat Satellite Viewer"></iframe>

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https://www.satcat.com/sats-embedded/21403?theme=dark&initialShowStats=false

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ISO8601 Format

Identifier

21403, 1991-009BS

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: 15 hours ago

TLE from 15 hours ago

0 SL-8 DEB
1 21403U 91009BS  26171.27285875  .00000072  00000-0  70575-3 0  9996
2 21403  73.9355  99.7938 0134138  17.6305 136.5521 12.31851740584924

Epoch: 2026-06-20T06:32Z

TLE epoch observation values (Epoch: 2026-06-20T06:32:54.996Z)

Latitude

23.77028°

Longitude

-94.17632°

Altitude

1,621.491 km

Speed

7.027 km/s

True Right ascension

18h 10m 10s

True Declination

23° 39' 26"

Sunlit

Object was in full shadow 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

08:46:28

Azimuth

Unknown

Elevation

Unknown

Doppler factor

Unknown

Orbital elements

Apogee altitude

1,645.399 km

Perigee altitude

1,432.996 km

Semi-major axis

7,917.335 km

Eccentricity

0.01341

Inclination

73.9355°

RAAN

99.7938°

Arg. of periapsis

17.6305°

True anomaly

137.59638°

Mean anomaly

136.5521°

Eccentric anomaly

137.07551°

Mean motion

3.08088 °/min

Orbital period

116.85 mins

BSTAR

0.00070575

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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.
5 mins	2026-06-21 03:44:28.804Z	20.345° NNE	2026-06-21 03:47:28.804Z	40.161° NE	11.423°	2026-06-21 03:49:28.804Z	53.289° ENE
16 mins	2026-06-21 05:41:28.804Z	352.143° N	2026-06-21 05:49:28.804Z	67.817° E	37.466°	2026-06-21 05:57:28.804Z	135.518° SSE
15 mins	2026-06-21 07:41:28.804Z	322.026° NNW	2026-06-21 07:48:28.804Z	261.196° W	32.275°	2026-06-21 07:56:28.804Z	199.83° SSW
12 mins	2026-06-21 18:51:28.804Z	139.707° SSE	2026-06-21 18:57:28.804Z	88.095° E	23.631°	2026-06-21 19:03:28.804Z	42.553° NE
15 mins	2026-06-21 20:48:28.804Z	214.068° SW	2026-06-21 20:55:28.804Z	290.852° WNW	41.945°	2026-06-21 21:03:28.804Z	13.076° NNE

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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, 21403 on other resources

View SL-8 DEB, 21403 on Heavens-Above

View SL-8 DEB, 21403 on Keep Track

View SL-8 DEB, 21403 on Celestrak

View SL-8 DEB, 21403 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, 21403

Orbit data source: Space-Track

Expand to show TLE details & historyLast TLE update: 15 hours ago

TLE from 15 hours ago

TLE epoch observation values (Epoch: 2026-06-20T06:32:54.996Z)

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, 21403 on other resources

Documentation

Expand to show TLE details & history
Last TLE update: 15 hours ago