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)

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Last TLE update: 22 hours ago

TLE from 22 hours ago

0 SL-8 DEB
1 21173U 91009AL  26070.33104552  .00000001  00000-0  14837-3 0  9998
2 21173  74.1110  43.0338 0136141 358.5130  70.0958 12.19280938558541

Epoch: 2026-03-11T07:56Z

TLE epoch observation values (Epoch: 2026-03-11T07:56:42.332Z)

Latitude

64.81503°

Longitude

151.90142°

Altitude

1,570.847 km

Speed

7.104 km/s

True Right ascension

05h 20m 17s

True Declination

64° 41' 45"

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

10:36:09

Azimuth

Unknown

Elevation

Unknown

Doppler factor

Unknown

Orbital elements

Apogee altitude

1,702.066 km

Perigee altitude

1,485.012 km

Semi-major axis

7,971.676 km

Eccentricity

0.01361

Inclination

74.111°

RAAN

43.0338°

Arg. of periapsis

358.513°

True anomaly

71.57105°

Mean anomaly

70.0958°

Eccentric anomaly

70.83259°

Mean motion

3.04943 °/min

Orbital period

118.05 mins

BSTAR

0.00014837

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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	2026-03-12 07:46:58.328Z	0.711° NNE	2026-03-12 07:53:58.328Z	54.031° ENE	26.842°	2026-03-12 08:01:58.328Z	112.208° ESE
18 mins	2026-03-12 09:46:58.328Z	335.75° NNW	2026-03-12 09:54:58.328Z	274.176° WNW	43.068°	2026-03-12 10:04:58.328Z	175.66° S
5 mins	2026-03-12 11:51:58.328Z	289.184° WNW	2026-03-12 11:53:58.328Z	276.498° WNW	12.236°	2026-03-12 11:56:58.328Z	257.664° W
7 mins	2026-03-12 21:07:58.328Z	110.81° ESE	2026-03-12 21:10:58.328Z	89.286° E	14.407°	2026-03-12 21:14:58.328Z	60.909° ENE
16 mins	2026-03-12 23:02:58.328Z	192.457° SSW	2026-03-12 23:09:58.328Z	141.427° SSE	44.741°	2026-03-12 23:18:58.328Z	20.49° NNE
11 mins	2026-03-13 01:06:58.328Z	268.669° W	2026-03-13 01:11:58.328Z	309.02° NW	21.544°	2026-03-13 01:17:58.328Z	354.609° 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: 22 hours ago

TLE from 22 hours ago

TLE epoch observation values (Epoch: 2026-03-11T07:56:42.332Z)

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: 22 hours ago