SL-8 DEB, 21405

Orbit data source: Space-Track

SL-8 DEB, 21405 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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https://www.satcat.com/sats-embedded/21405?theme=dark&initialShowStats=false

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ISO8601 Format

Identifier

21405, 1991-009BU

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, 0.3 m

Radar Cross Section

Medium (>0.1 m² and <1 m²)

Expand to show TLE details & history
Last TLE update: 13 hours ago

TLE from 13 hours ago

0 SL-8 DEB
1 21405U 91009BU  26171.36154161 -.00000008  00000-0  53382-4 0  9999
2 21405  73.9568 139.3117 0226441  59.1610  91.0345 12.18865489568337

Epoch: 2026-06-20T08:40Z

TLE epoch observation values (Epoch: 2026-06-20T08:40:37.195Z)

Latitude

26.10669°

Longitude

-87.48204°

Altitude

1,607.482 km

Speed

7.065 km/s

True Right ascension

20h 45m 00s

True Declination

25° 59' 08"

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

08:46:28

Azimuth

Unknown

Elevation

Unknown

Doppler factor

Unknown

Orbital elements

Apogee altitude

1,775.915 km

Perigee altitude

1,414.809 km

Semi-major axis

7,973.499 km

Eccentricity

0.02264

Inclination

73.9568°

RAAN

139.3117°

Arg. of periapsis

59.161°

True anomaly

93.62669°

Mean anomaly

91.0345°

Eccentric anomaly

92.33084°

Mean motion

3.04838 °/min

Orbital period

118.1 mins

BSTAR

0.000053382

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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	2026-06-20 21:50:28.704Z	107.719° ESE	2026-06-20 21:51:28.704Z	96.123° ESE	26.006°	2026-06-20 21:57:28.704Z	43.823° NE
15 mins	2026-06-20 23:44:28.704Z	219.321° SW	2026-06-20 23:51:28.704Z	291.652° WNW	39.773°	2026-06-20 23:59:28.704Z	11.433° NNE
15 mins	2026-06-21 08:05:28.704Z	357.263° N	2026-06-21 08:12:28.704Z	63.233° ENE	33.526°	2026-06-21 08:20:28.704Z	128.23° SE
15 mins	2026-06-21 10:06:28.704Z	323.988° NNW	2026-06-21 10:13:28.704Z	252.054° W	35.701°	2026-06-21 10:21:28.704Z	192.202° SSW
11 mins	2026-06-21 21:24:28.704Z	135.976° SSE	2026-06-21 21:29:28.704Z	94.859° ESE	21.995°	2026-06-21 21:35:28.704Z	46.316° ENE

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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, 21405 on other resources

View SL-8 DEB, 21405 on Heavens-Above

View SL-8 DEB, 21405 on Keep Track

View SL-8 DEB, 21405 on Celestrak

View SL-8 DEB, 21405 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, 21405

Orbit data source: Space-Track

Expand to show TLE details & historyLast TLE update: 13 hours ago

TLE from 13 hours ago

TLE epoch observation values (Epoch: 2026-06-20T08:40:37.195Z)

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, 21405 on other resources

Documentation

Expand to show TLE details & history
Last TLE update: 13 hours ago