SL-8 DEB, 21157

Orbit data source: Space-Track

SL-8 DEB, 21157 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/21157?theme=dark&initialShowStats=false

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Identifier

21157, 1991-009U

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, 0.4 m

Radar Cross Section

Medium (>0.1 m² and <1 m²)

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Last TLE update: 2 days ago

TLE from 2 days ago

0 SL-8 DEB
1 21157U 91009U   26171.38436412 -.00000018  00000-0 -22437-4 0  9996
2 21157  73.9524 322.3696 0174826 239.6981 144.5244 12.24125526577154

Epoch: 2026-06-20T09:13Z

TLE epoch observation values (Epoch: 2026-06-20T09:13:29.059Z)

Latitude

24.33836°

Longitude

-77.16126°

Altitude

1,691.083 km

Speed

6.981 km/s

True Right ascension

21h 59m 14s

True Declination

24° 13' 28"

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

03:41:34

Azimuth

Unknown

Elevation

Unknown

Doppler factor

Unknown

Orbital elements

Apogee altitude

1,711.491 km

Perigee altitude

1,433.495 km

Semi-major axis

7,950.63 km

Eccentricity

0.01748

Inclination

73.9524°

RAAN

322.3696°

Arg. of periapsis

239.6981°

True anomaly

145.66664°

Mean anomaly

144.5244°

Eccentric anomaly

145.09754°

Mean motion

3.06155 °/min

Orbital period

117.59 mins

BSTAR

-0.000022437

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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.
9 mins	2026-06-22 18:33:33.095Z	10.843° NNE	2026-06-22 18:37:33.095Z	36.595° NE	14.401°	2026-06-22 18:42:33.095Z	69.951° E
17 mins	2026-06-22 20:32:33.095Z	348.773° N	2026-06-22 20:40:33.095Z	61.545° ENE	40.838°	2026-06-22 20:49:33.095Z	144.597° SSE
14 mins	2026-06-22 22:33:33.095Z	318.338° NNW	2026-06-22 22:40:33.095Z	261.957° W	27.434°	2026-06-22 22:47:33.095Z	209.529° SW
16 mins	2026-06-23 09:44:33.095Z	155.609° SSE	2026-06-23 09:52:33.095Z	89.857° E	31.961°	2026-06-23 10:00:33.095Z	34° NE
18 mins	2026-06-23 11:43:33.095Z	223.011° SW	2026-06-23 11:51:33.095Z	289.888° WNW	38.799°	2026-06-23 12:01:33.095Z	12.157° NNE
7 mins	2026-06-23 13:51:33.095Z	300.768° NW	2026-06-23 13:54:33.095Z	319.681° NNW	13.435°	2026-06-23 13:58:33.095Z	344.906° N

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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, 21157 on other resources

View SL-8 DEB, 21157 on Heavens-Above

View SL-8 DEB, 21157 on Keep Track

View SL-8 DEB, 21157 on Celestrak

View SL-8 DEB, 21157 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, 21157

Orbit data source: Space-Track

Expand to show TLE details & historyLast TLE update: 2 days ago

TLE from 2 days ago

TLE epoch observation values (Epoch: 2026-06-20T09:13:29.059Z)

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, 21157 on other resources

Documentation

Expand to show TLE details & history
Last TLE update: 2 days ago