SL-8 DEB, 21404

Orbit data source: Space-Track

SL-8 DEB, 21404 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/21404?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/21404?theme=dark&initialShowStats=false

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ISO8601 Format

Identifier

21404, 1991-009BT

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: 12 hours ago

TLE from 12 hours ago

0 SL-8 DEB
1 21404U 91009BT  26171.41927190  .00000033  00000-0  34631-3 0  9996
2 21404  73.9566 159.2216 0185641 317.3471 197.1215 12.41502684597309

Epoch: 2026-06-20T10:03Z

TLE epoch observation values (Epoch: 2026-06-20T10:03:45.092Z)

Latitude

25.08461°

Longitude

-88.04928°

Altitude

1,642.793 km

Speed

6.99 km/s

True Right ascension

22h 06m 05s

True Declination

24° 58' 03"

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

08:46:33

Azimuth

Unknown

Elevation

Unknown

Doppler factor

Unknown

Orbital elements

Apogee altitude

1,644.304 km

Perigee altitude

1,351.874 km

Semi-major axis

7,876.226 km

Eccentricity

0.01856

Inclination

73.9566°

RAAN

159.2216°

Arg. of periapsis

317.3471°

True anomaly

196.50884°

Mean anomaly

197.1215°

Eccentric anomaly

196.81383°

Mean motion

3.10503 °/min

Orbital period

115.94 mins

BSTAR

0.00034631

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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.
12 mins	2026-06-20 22:52:33.362Z	136.484° SSE	2026-06-20 22:57:33.362Z	96.385° ESE	22.563°	2026-06-20 23:04:33.362Z	43.102° NE
16 mins	2026-06-21 00:48:33.362Z	210.823° SW	2026-06-21 00:55:33.362Z	295.29° NW	43.101°	2026-06-21 01:04:33.362Z	15.508° NNE
8 mins	2026-06-21 02:52:33.362Z	291.204° WNW	2026-06-21 02:55:33.362Z	313.565° NW	15.88°	2026-06-21 03:00:33.362Z	348.99° N
15 mins	2026-06-21 09:01:33.362Z	1.549° NNE	2026-06-21 09:08:33.362Z	59.251° ENE	28.643°	2026-06-21 09:16:33.362Z	117.195° SE
17 mins	2026-06-21 10:59:33.362Z	333.237° NNW	2026-06-21 11:07:33.362Z	250.998° W	42.123°	2026-06-21 11:16:33.362Z	178.781° S

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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, 21404 on other resources

View SL-8 DEB, 21404 on Heavens-Above

View SL-8 DEB, 21404 on Keep Track

View SL-8 DEB, 21404 on Celestrak

View SL-8 DEB, 21404 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, 21404

Orbit data source: Space-Track

Expand to show TLE details & historyLast TLE update: 12 hours ago

TLE from 12 hours ago

TLE epoch observation values (Epoch: 2026-06-20T10:03:45.092Z)

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, 21404 on other resources

Documentation

Expand to show TLE details & history
Last TLE update: 12 hours ago