SL-8 DEB, 21178

Orbit data source: Space-Track

SL-8 DEB, 21178 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.

Loading next visibility...

Iframe embed code

<iframe src="https://www.satcat.com/sats-embedded/21178?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/21178?theme=dark&initialShowStats=false

Optional Secondary NORAD IDs

Max 10 NORAD IDs; Separated by commas

Initial load time (optional)

ISO8601 Format

TLE date request (optional)

ISO8601 Format

Identifier

21178, 1991-009AR

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: 15 hours ago

TLE from 15 hours ago

0 SL-8 DEB
1 21178U 91009AR  26154.66564402  .00000084  00000-0  96503-3 0  9997
2 21178  74.0987  13.4776 0140664   0.7483  56.5097 12.16338783567717

Epoch: 2026-06-03T15:58Z

TLE epoch observation values (Epoch: 2026-06-03T15:58:31.643Z)

Latitude

55.28543°

Longitude

-94.12087°

Altitude

1,556.407 km

Speed

7.121 km/s

True Right ascension

02h 30m 31s

True Declination

55° 08' 26"

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

16:31:27

Azimuth

Unknown

Elevation

Unknown

Doppler factor

Unknown

Orbital elements

Apogee altitude

1,718.71 km

Perigee altitude

1,494.083 km

Semi-major axis

7,984.533 km

Eccentricity

0.01407

Inclination

74.0987°

RAAN

13.4776°

Arg. of periapsis

0.7483°

True anomaly

57.86702°

Mean anomaly

56.5097°

Eccentric anomaly

57.18705°

Mean motion

3.04207 °/min

Orbital period

118.34 mins

BSTAR

0.00096503

Loading maneuver chart data...

Computing Atmospheric mass density...

Loading historical data...

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

Did you know?

You can import UDL-sourced sensor .json files into the Sandbox to generate a visibility chart that accounts for multi-vendor sensor geometry.

Click here to try in Sandbox

SL-8 DEB Visibility forecast

Loading observer location...
Set Observer location

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.
4 mins	2026-06-04 13:33:01.564Z	97.861° ESE	2026-06-04 13:35:01.564Z	84.108° E	11.574°	2026-06-04 13:37:01.564Z	70.523° E
15 mins	2026-06-04 15:27:01.564Z	185.119° SSW	2026-06-04 15:34:01.564Z	98.284° ESE	43.737°	2026-06-04 15:42:01.564Z	23.229° NE
13 mins	2026-06-04 17:30:01.564Z	260.111° W	2026-06-04 17:36:01.564Z	310.623° NW	24.115°	2026-06-04 17:43:01.564Z	1.443° NNE
13 mins	2026-06-04 23:50:01.564Z	8.058° NNE	2026-06-04 23:56:01.564Z	52.327° ENE	21.571°	2026-06-05 00:03:01.564Z	99.123° ESE
17 mins	2026-06-05 01:50:01.564Z	341.163° N	2026-06-05 01:58:01.564Z	33.593° NE	45°	2026-06-05 02:07:01.564Z	163.732° S
10 mins	2026-06-05 03:53:01.564Z	302.831° NW	2026-06-05 03:58:01.564Z	267.864° W	18.249°	2026-06-05 04:03:01.564Z	235.103° WSW

Items per page:

1–6 of 6 items

of 1 page

Co-orbital & Co-planar RSOs

Thresholds — Semi-major Axis: ±100 km, RAAN: ±3°, Inclination: ±5°
TCA is derived from TLE conjunctions

Please sign-in to view Co-orbital & Co-planar RSOs.

Click to sort rows by RSO header in ascending order	Click to sort rows by Country header in ascending order	Click to sort rows by Type header in ascending order	Click to sort rows by Inclination Δ header in ascending order	Click to sort rows by RAAN Δ header in ascending order	Click to sort rows by Coplanar Angle header in ascending order	Click to sort rows by SMA Δ header in ascending order	Click to sort rows by Orbital period header in ascending order	Click to sort rows by <5km Md TCA header in descending order

CAUTION: Conjunctions in this section are generated from low-fidelity TLE screenings

Authenticating...

Click to sort rows by Secondary header in ascending order	Click to sort rows by Secondary name header in ascending order	Click to sort rows by Country header in ascending order	Click to sort rows by Owner header in ascending order	Click to sort rows by Obj. Type header in ascending order	Click to sort rows by Miss dist. header in ascending order	Click to sort rows by Rel. speed header in ascending order	Click to sort rows by Apr. angle header in ascending order	Click to sort rows by TCA header in descending order

Check out SL-8 DEB, 21178 on other resources

View SL-8 DEB, 21178 on Heavens-Above

View SL-8 DEB, 21178 on Keep Track

View SL-8 DEB, 21178 on Celestrak

View SL-8 DEB, 21178 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, 21178

Orbit data source: Space-Track

Expand to show TLE details & historyLast TLE update: 15 hours ago

TLE from 15 hours ago

TLE epoch observation values (Epoch: 2026-06-03T15:58:31.643Z)

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, 21178 on other resources

Documentation

Expand to show TLE details & history
Last TLE update: 15 hours ago