SL-8 DEB, 21171

Orbit data source: Space-Track

SL-8 DEB, 21171 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/21171?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/21171?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

21171, 1991-009AJ

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: 2 days ago

TLE from 2 days ago

0 SL-8 DEB
1 21171U 91009AJ  26171.35311640 -.00000027  00000-0 -96571-4 0  9994
2 21171  73.9532  36.9433 0193875 323.7335 211.2866 12.21759093574012

Epoch: 2026-06-20T08:28Z

TLE epoch observation values (Epoch: 2026-06-20T08:28:29.256Z)

Latitude

5.80414°

Longitude

179.58499°

Altitude

1,719.403 km

Speed

6.959 km/s

True Right ascension

14h 21m 06s

True Declination

5° 46' 25"

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

03:40:33

Azimuth

Unknown

Elevation

Unknown

Doppler factor

Unknown

Orbital elements

Apogee altitude

1,737.103 km

Perigee altitude

1,428.419 km

Semi-major axis

7,960.898 km

Eccentricity

0.01939

Inclination

73.9532°

RAAN

36.9433°

Arg. of periapsis

323.7335°

True anomaly

210.15636°

Mean anomaly

211.2866°

Eccentric anomaly

210.71916°

Mean motion

3.05562 °/min

Orbital period

117.82 mins

BSTAR

-0.000096571

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.
15 mins	2026-06-22 16:37:32.322Z	219.633° SW	2026-06-22 16:44:32.322Z	306.08° NW	40.826°	2026-06-22 16:52:32.322Z	12.153° NNE
8 mins	2026-06-22 18:43:32.322Z	296.379° NW	2026-06-22 18:46:32.322Z	316.96° NNW	14.261°	2026-06-22 18:51:32.322Z	349.888° N
17 mins	2026-06-23 00:57:32.322Z	355.719° N	2026-06-23 01:05:32.322Z	63.907° ENE	34.47°	2026-06-23 01:14:32.322Z	129.519° SE
17 mins	2026-06-23 02:57:32.322Z	328.743° NNW	2026-06-23 03:05:32.322Z	265.284° W	37.468°	2026-06-23 03:14:32.322Z	191.369° SSW
11 mins	2026-06-23 14:14:32.322Z	128.949° SE	2026-06-23 14:19:32.322Z	87.945° E	21.899°	2026-06-23 14:25:32.322Z	45.187° ENE
16 mins	2026-06-23 16:11:32.322Z	208.504° SW	2026-06-23 16:18:32.322Z	293.325° NW	43.77°	2026-06-23 16:27:32.322Z	15.943° NNE

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, 21171 on other resources

View SL-8 DEB, 21171 on Heavens-Above

View SL-8 DEB, 21171 on Keep Track

View SL-8 DEB, 21171 on Celestrak

View SL-8 DEB, 21171 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, 21171

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: 2026-06-20T08:28:29.256Z)

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, 21171 on other resources

Documentation

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