SL-8 DEB, 21173

Orbit data source: Space-Track

SL-8 DEB, 21173 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/21173?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/21173?theme=dark&initialShowStats=false

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ISO8601 Format

Identifier

21173, 1991-009AL

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, 0.2 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 21173U 91009AL  26171.40810571  .00000027  00000-0  39027-3 0  9999
2 21173  74.1114 276.8650 0136303 214.7091 218.6787 12.19283401570864

Epoch: 2026-06-20T09:47Z

TLE epoch observation values (Epoch: 2026-06-20T09:47:40.333Z)

Latitude

66.56216°

Longitude

-97.87448°

Altitude

1,692.244 km

Speed

6.997 km/s

True Right ascension

21h 10m 40s

True Declination

66° 27' 04"

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

00:50:08

Azimuth

Unknown

Elevation

Unknown

Doppler factor

Unknown

Orbital elements

Apogee altitude

1,702.184 km

Perigee altitude

1,484.872 km

Semi-major axis

7,971.665 km

Eccentricity

0.01363

Inclination

74.1114°

RAAN

276.865°

Arg. of periapsis

214.7091°

True anomaly

217.71544°

Mean anomaly

218.6787°

Eccentric anomaly

218.19579°

Mean motion

3.04944 °/min

Orbital period

118.05 mins

BSTAR

0.00039027

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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	2026-06-22 17:08:35.067Z	355.748° N	2026-06-22 17:15:35.067Z	57.728° ENE	34.865°	2026-06-22 17:23:35.067Z	129.648° SE
14 mins	2026-06-22 19:09:35.067Z	323.75° NNW	2026-06-22 19:16:35.067Z	257.574° W	34.362°	2026-06-22 19:23:35.067Z	197.766° SSW
14 mins	2026-06-23 06:24:35.067Z	142.769° SSE	2026-06-23 06:31:35.067Z	90.075° ESE	26.288°	2026-06-23 06:38:35.067Z	40.762° NE
18 mins	2026-06-23 08:22:35.067Z	211.96° SW	2026-06-23 08:31:35.067Z	307.008° NW	42.391°	2026-06-23 08:40:35.067Z	14.3° NNE
10 mins	2026-06-23 10:29:35.067Z	287.452° WNW	2026-06-23 10:33:35.067Z	314.031° NW	16.245°	2026-06-23 10:39:35.067Z	353.066° 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, 21173 on other resources

View SL-8 DEB, 21173 on Heavens-Above

View SL-8 DEB, 21173 on Keep Track

View SL-8 DEB, 21173 on Celestrak

View SL-8 DEB, 21173 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, 21173

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: 2026-06-20T09:47:40.333Z)

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, 21173 on other resources

Documentation

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