SL-8 DEB, 21177

Orbit data source: Space-Track

SL-8 DEB, 21177 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/21177?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/21177?theme=dark&initialShowStats=false

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Identifier

21177, 1991-009AQ

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: 2 days ago

TLE from 2 days ago

0 SL-8 DEB
1 21177U 91009AQ  26171.23553286 -.00000050  00000-0 -37460-3 0  9998
2 21177  74.1069  90.4114 0145405  72.5107  80.5255 12.13555136563334

Epoch: 2026-06-20T05:39Z

TLE epoch observation values (Epoch: 2026-06-20T05:39:10.039Z)

Latitude

24.31229°

Longitude

-90.18816°

Altitude

1,605.654 km

Speed

7.077 km/s

True Right ascension

17h 32m 13s

True Declination

24° 11' 50"

Sunlit

Object was in full shadow 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

03:45:27

Azimuth

Unknown

Elevation

Unknown

Doppler factor

Unknown

Orbital elements

Apogee altitude

1,734.884 km

Perigee altitude

1,502.331 km

Semi-major axis

7,996.745 km

Eccentricity

0.01454

Inclination

74.1069°

RAAN

90.4114°

Arg. of periapsis

72.5107°

True anomaly

82.17369°

Mean anomaly

80.5255°

Eccentric anomaly

81.34913°

Mean motion

3.0351 °/min

Orbital period

118.61 mins

BSTAR

-0.0003746

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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.
14 mins	2026-06-22 18:14:25.066Z	151.263° SSE	2026-06-22 18:21:25.066Z	95.189° ESE	27.992°	2026-06-22 18:28:25.066Z	38.876° NE
16 mins	2026-06-22 20:14:25.066Z	220.194° SW	2026-06-22 20:22:25.066Z	304.029° NW	39.257°	2026-06-22 20:30:25.066Z	11.264° NNE
4 mins	2026-06-22 22:24:25.066Z	311.791° NW	2026-06-22 22:25:25.066Z	318.827° NNW	11.904°	2026-06-22 22:28:25.066Z	339.513° N
15 mins	2026-06-23 04:38:25.066Z	356.468° N	2026-06-23 04:45:25.066Z	62.67° ENE	34.976°	2026-06-23 04:53:25.066Z	130.544° SE
15 mins	2026-06-23 06:39:25.066Z	324.538° NNW	2026-06-23 06:46:25.066Z	261.805° W	34.37°	2026-06-23 06:54:25.066Z	196.415° SSW

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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, 21177 on other resources

View SL-8 DEB, 21177 on Heavens-Above

View SL-8 DEB, 21177 on Keep Track

View SL-8 DEB, 21177 on Celestrak

View SL-8 DEB, 21177 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, 21177

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: 2026-06-20T05:39:10.039Z)

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, 21177 on other resources

Documentation

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