SL-8 DEB, 21958

Orbit data source: Space-Track

SL-8 DEB, 21958 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 URL

https://www.satcat.com/sats-embedded/21958?theme=dark&initialShowStats=false

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ISO8601 Format

Identifier

21958, 1991-009CG

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, 0.1 m

Radar Cross Section

Medium (>0.1 m² and <1 m²)

Expand to show TLE details & history
Last TLE update: 16 hours ago

TLE from 16 hours ago

0 SL-8 DEB
1 21958U 91009CG  26154.60057865  .00000071  00000-0  83826-3 0  9997
2 21958  73.9642 233.2858 0133267 172.4318 309.8139 12.16808772565132

Epoch: 2026-06-03T14:24Z

TLE epoch observation values (Epoch: 2026-06-03T14:24:49.995Z)

Latitude

55.51424°

Longitude

-79.58593°

Altitude

1,547.989 km

Speed

7.128 km/s

True Right ascension

01h 54m 43s

True Declination

55° 22' 11"

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

16:33:03

Azimuth

Unknown

Elevation

Unknown

Doppler factor

Unknown

Orbital elements

Apogee altitude

1,710.73 km

Perigee altitude

1,497.969 km

Semi-major axis

7,982.487 km

Eccentricity

0.01333

Inclination

73.9642°

RAAN

233.2858°

Arg. of periapsis

172.4318°

True anomaly

308.62831°

Mean anomaly

309.8139°

Eccentric anomaly

309.22237°

Mean motion

3.04324 °/min

Orbital period

118.3 mins

BSTAR

0.00083826

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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.
17 mins	2026-06-04 07:37:37.872Z	233.696° WSW	2026-06-04 07:45:37.872Z	293.726° NW	33.191°	2026-06-04 07:54:37.872Z	7.213° NNE
7 mins	2026-06-04 14:02:37.872Z	21.21° NNE	2026-06-04 14:05:37.872Z	42.58° NE	14.065°	2026-06-04 14:09:37.872Z	70.36° E
16 mins	2026-06-04 16:00:37.872Z	347.771° N	2026-06-04 16:08:37.872Z	68.437° E	41.608°	2026-06-04 16:16:37.872Z	146.098° SSE
13 mins	2026-06-04 18:02:37.872Z	315.113° NNW	2026-06-04 18:08:37.872Z	266.723° W	24.991°	2026-06-04 18:15:37.872Z	213.121° SW
16 mins	2026-06-05 05:17:37.872Z	162.578° S	2026-06-05 05:25:37.872Z	96.682° ESE	34.878°	2026-06-05 05:33:37.872Z	32.937° NE

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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, 21958 on other resources

View SL-8 DEB, 21958 on Heavens-Above

View SL-8 DEB, 21958 on Keep Track

View SL-8 DEB, 21958 on Celestrak

View SL-8 DEB, 21958 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, 21958

Orbit data source: Space-Track

Expand to show TLE details & historyLast TLE update: 16 hours ago

TLE from 16 hours ago

TLE epoch observation values (Epoch: 2026-06-03T14:24:49.995Z)

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, 21958 on other resources

Documentation

Expand to show TLE details & history
Last TLE update: 16 hours ago