SL-8 DEB, 21959
Orbit data source: Space-Track
SL-8 DEB, 21959 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.
Focus sentinelFocus sentinel
Request partner network tasking
Focus sentinelFocus sentinel
Embed this page
Focus sentinelFocus sentinel
21959 intel report (Beta)
Focus sentinelFocus sentinel
Edit Public Description
Focus sentinelFocus sentinel
Edit Sat Name
Focus sentinelFocus sentinel
Create New Watchlist
Identifier
Orbit
Country
CISRelated business
Manufacturer
Unknown
Mission
Spacecraft
Bus & Motor
Unknown
Mass
Unknown
Launch date (UTC)
Launch vehicle
Unknown
Launch site
Object type
Shape & HBR
Unknown shape, 0.1 m
Radar Cross Section
Medium (>0.1 m² and <1 m²)
Expand to show TLE details & historyLast TLE update: 2 days ago
TLE from 2 days ago
0 SL-8 DEB
1 21959U 91009CH 26171.39111427 .00000059 00000-0 70175-3 0 9997
2 21959 73.9656 168.0121 0128677 87.7594 36.1437 12.18969457568807Epoch: 2026-06-20T09:23Z
TLE epoch observation values (Epoch: 2026-06-20T09:23:12.272Z)
Latitude
52.2237°
Longitude
-83.0501°
Altitude
1,522.663 km
Speed
7.146 km/s
True Right ascension
21h 45m 25s
True Declination
52° 04' 24"
Sunlit
Visualization orbit readout
Latitude
Unknown
Longitude
Unknown
Altitude
Unknown
Speed
Unknown
Apparent Right ascension
Unknown
Apparent Declination
Unknown
Sunlit
Visualization observer readout
Local Sidereal Time
00:51:04
Azimuth
Unknown
Elevation
Unknown
Doppler factor
Unknown
Orbital elements
Apogee altitude
1,697.504 km
Perigee altitude
1,492.314 km
Semi-major axis
7,973.046 km
Eccentricity
0.01287
Inclination
73.9656°
RAAN
168.0121°
Arg. of periapsis
87.7594°
True anomaly
37.0248°
Mean anomaly
36.1437°
Eccentric anomaly
36.5831°
Mean motion
3.04864 °/min
Orbital period
118.09 mins
BSTAR
0.00070175
Loading maneuver chart data...
Computing Atmospheric mass density...
Loading historical data...
Loading historical data...
Loading historical data...
Loading historical data...
Loading historical data...
Loading historical data...
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.SL-8 DEB Visibility forecast
Loading 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. |
|---|---|---|---|---|---|---|---|
| 16 mins | 2026-06-22 23:49:31.030Z | 167.249° S | 2026-06-22 23:57:31.030Z | 95.346° ESE | 35.953° | 2026-06-23 00:05:31.030Z | 30.443° NE |
| 14 mins | 2026-06-23 01:51:31.030Z | 238.634° WSW | 2026-06-23 01:57:31.030Z | 293.267° NW | 32.693° | 2026-06-23 02:05:31.030Z | 5.369° NNE |
| 6 mins | 2026-06-23 08:13:31.030Z | 23.013° NE | 2026-06-23 08:16:31.030Z | 44.357° NE | 13.048° | 2026-06-23 08:19:31.030Z | 65.038° ENE |
| 16 mins | 2026-06-23 10:11:31.030Z | 349.681° N | 2026-06-23 10:18:31.030Z | 53.512° ENE | 40.526° | 2026-06-23 10:27:31.030Z | 144.423° SSE |
| 13 mins | 2026-06-23 12:13:31.030Z | 312.84° NW | 2026-06-23 12:18:31.030Z | 270.606° WNW | 26.623° | 2026-06-23 12:26:31.030Z | 209.086° SW |
Co-orbital & Co-planar RSOs
Thresholds — Semi-major Axis: ±100 km, RAAN: ±3°, Inclination: ±5°
TCA is derived from TLE conjunctions
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 |
|---|