SL-8 DEB, 21156

Orbit data source: Space-Track

SL-8 DEB, 21156 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/21156?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/21156?theme=dark&initialShowStats=false

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ISO8601 Format

Identifier

21156, 1991-009T

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: 16 hours ago

TLE from 16 hours ago

0 SL-8 DEB
1 21156U 91009T   26070.53218918 -.00000023  00000-0 -63278-4 0  9993
2 21156  73.9108 112.6839 0145992  79.8154  35.7294 12.33873201577222

Epoch: 2026-03-11T12:46Z

TLE epoch observation values (Epoch: 2026-03-11T12:46:21.145Z)

Latitude

59.37016°

Longitude

-97.09396°

Altitude

1,449.179 km

Speed

7.185 km/s

True Right ascension

17h 34m 45s

True Declination

59° 13' 57"

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

09:01:43

Azimuth

Unknown

Elevation

Unknown

Doppler factor

Unknown

Orbital elements

Apogee altitude

1,646.005 km

Perigee altitude

1,415.085 km

Semi-major axis

7,908.682 km

Eccentricity

0.0146

Inclination

73.9108°

RAAN

112.6839°

Arg. of periapsis

79.8154°

True anomaly

36.72096°

Mean anomaly

35.7294°

Eccentric anomaly

36.2237°

Mean motion

3.08594 °/min

Orbital period

116.66 mins

BSTAR

-0.000063278

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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	2026-03-12 05:50:48.268Z	261.596° W	2026-03-12 05:56:48.268Z	308.817° NW	20.857°	2026-03-12 06:02:48.268Z	355.95° N
11 mins	2026-03-12 12:05:48.268Z	11.637° NNE	2026-03-12 12:10:48.268Z	52.478° ENE	19.876°	2026-03-12 12:16:48.268Z	97.038° ESE
16 mins	2026-03-12 14:03:48.268Z	340.331° N	2026-03-12 14:10:48.268Z	295.129° NW	44.974°	2026-03-12 14:19:48.268Z	164.359° S
7 mins	2026-03-12 16:05:48.268Z	293.214° NW	2026-03-12 16:08:48.268Z	270.24° WNW	15.648°	2026-03-12 16:12:48.268Z	241.15° WSW
15 mins	2026-03-13 03:09:48.268Z	174.268° S	2026-03-13 03:16:48.268Z	108.129° ESE	39.388°	2026-03-13 03:24:48.268Z	28.323° NE

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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, 21156 on other resources

View SL-8 DEB, 21156 on Heavens-Above

View SL-8 DEB, 21156 on Keep Track

View SL-8 DEB, 21156 on Celestrak

View SL-8 DEB, 21156 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, 21156

Orbit data source: Space-Track

Expand to show TLE details & historyLast TLE update: 16 hours ago

TLE from 16 hours ago

TLE epoch observation values (Epoch: 2026-03-11T12:46:21.145Z)

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, 21156 on other resources

Documentation

Expand to show TLE details & history
Last TLE update: 16 hours ago