SL-8 R/B, 21108

Orbit data source: Space-Track

SL-8 R/B, 21108 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/21108?theme=dark&initialShowStats=false

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Identifier

21108, 1991-009J

Orbit

LEO

Country

CIS

Related business

Russian Strategic Rocket Forces (RU)

Manufacturer

Polyot

Mission

Spacecraft

Bus & Motor

S3, Unknown motor

Mass

1,434 kg wet, 1,434 kg dry

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

Cyl, 3.3 m

Radar Cross Section

14.646 m², Large (>1 m²)

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

TLE from 2 days ago

0 SL-8 R/B
1 21108U 91009J   26171.34379248  .00000024  00000-0  36787-3 0  9998
2 21108  74.0527 239.3837 0176121 307.9544 118.5848 12.18525026466041

Epoch: 2026-06-20T08:15Z

TLE epoch observation values (Epoch: 2026-06-20T08:15:03.670Z)

Latitude

63.38476°

Longitude

-118.36375°

Altitude

1,678.617 km

Speed

7.01 km/s

True Right ascension

18h 15m 50s

True Declination

63° 15' 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

05:18:44

Azimuth

Unknown

Elevation

Unknown

Doppler factor

Unknown

Orbital elements

Apogee altitude

1,737.297 km

Perigee altitude

1,456.385 km

Semi-major axis

7,974.978 km

Eccentricity

0.01761

Inclination

74.0527°

RAAN

239.3837°

Arg. of periapsis

307.9544°

True anomaly

120.33825°

Mean anomaly

118.5848°

Eccentric anomaly

119.46339°

Mean motion

3.04754 °/min

Orbital period

118.13 mins

BSTAR

0.00036787

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Other satellites on launch #9 in the year 1991 (1991-02-12 UTC)

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SL-8 R/B 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.
18 mins	2026-06-23 04:54:26.554Z	180.816° SSW	2026-06-23 05:03:26.554Z	97.959° ESE	41.984°	2026-06-23 05:12:26.554Z	24.907° NE
14 mins	2026-06-23 06:58:26.554Z	252.308° W	2026-06-23 07:04:26.554Z	302.583° NW	28.074°	2026-06-23 07:12:26.554Z	3.023° NNE
13 mins	2026-06-23 13:18:26.554Z	5.901° NNE	2026-06-23 13:24:26.554Z	46.098° ENE	19.932°	2026-06-23 13:31:26.554Z	91.957° ESE
18 mins	2026-06-23 15:18:26.554Z	343.614° N	2026-06-23 15:27:26.554Z	98.228° ESE	44.452°	2026-06-23 15:36:26.554Z	157.722° S
13 mins	2026-06-23 17:20:26.554Z	312.021° NW	2026-06-23 17:26:26.554Z	271.055° WNW	21.882°	2026-06-23 17:33:26.554Z	224.059° SW

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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 R/B, 21108 on other resources

View SL-8 R/B, 21108 on Heavens-Above

View SL-8 R/B, 21108 on Keep Track

View SL-8 R/B, 21108 on Celestrak

View SL-8 R/B, 21108 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 R/B, 21108

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: 2026-06-20T08:15:03.670Z)

Visualization orbit readout

Visualization observer readout

Orbital elements

Other satellites on launch #9 in the year 1991 (1991-02-12 UTC)

SL-8 R/B Visibility forecast

Co-orbital & Co-planar RSOs

Check out SL-8 R/B, 21108 on other resources

Documentation

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