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 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

Small (<0.1 m²)

Expand to show TLE details & history
Last TLE update: 19 hours ago

TLE from 19 hours ago

0 SL-8 DEB
1 21404U 91009BT  26070.38541397  .00000042  00000-0  39390-3 0  9998
2 21404  73.9577 292.0245 0185480 106.6420  77.2582 12.41489510584766

Epoch: 2026-03-11T09:14Z

TLE epoch observation values (Epoch: 2026-03-11T09:14:59.767Z)

Latitude

-5.88219°

Longitude

165.91434°

Altitude

1,473.978 km

Speed

7.139 km/s

True Right ascension

07h 34m 51s

True Declination

-5° 51' 02"

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

09:02:59

Azimuth

Unknown

Elevation

Unknown

Doppler factor

Unknown

Orbital elements

Apogee altitude

1,644.234 km

Perigee altitude

1,352.055 km

Semi-major axis

7,876.282 km

Eccentricity

0.01855

Inclination

73.9577°

RAAN

292.0245°

Arg. of periapsis

106.642°

True anomaly

79.3415°

Mean anomaly

77.2582°

Eccentric anomaly

78.29884°

Mean motion

3.105 °/min

Orbital period

115.94 mins

BSTAR

0.0003939

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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	2026-03-12 15:18:03.607Z	179.43° S	2026-03-12 15:26:03.607Z	94.164° ESE	41.24°	2026-03-12 15:33:03.607Z	27.223° NE
12 mins	2026-03-12 17:19:03.607Z	252.626° W	2026-03-12 17:25:03.607Z	308.261° NW	26.292°	2026-03-12 17:31:03.607Z	358.954° N
6 mins	2026-03-12 23:33:03.607Z	23.567° NE	2026-03-12 23:36:03.607Z	46.945° ENE	13.349°	2026-03-12 23:39:03.607Z	69.639° E
15 mins	2026-03-13 01:29:03.607Z	347.863° N	2026-03-13 01:36:03.607Z	73.222° E	42.357°	2026-03-13 01:44:03.607Z	149.718° SSE
10 mins	2026-03-13 03:29:03.607Z	306.381° NW	2026-03-13 03:33:03.607Z	271.369° WNW	22.127°	2026-03-13 03:39:03.607Z	220.717° SW

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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: 19 hours ago

TLE from 19 hours ago

TLE epoch observation values (Epoch: 2026-03-11T09:14:59.767Z)

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: 19 hours ago