SL-8 R/B, 12139
Orbit data source: Space-Track
SL-8 R/B, 12139 is space debris in LEO originally from a launch on Fri, 16 Jan 1981 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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12139 intel report (Beta)
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Identifier
Orbit
Country
CISRelated business
Manufacturer
Omsk Av. Zav.
Mission
Spacecraft
Bus & Motor
S3, Unknown motor
Mass
1,434 kg wet, 1,434 kg dry
Launch date (UTC)
Launch vehicle
Unknown
Launch site
Object type
Shape & HBR
Unknown
Radar Cross Section
Large (>1 m²)
Expand to show TLE details & historyLast TLE update: 11 hours ago
TLE from 11 hours ago
0 SL-8 R/B
1 12139U 81003B 26092.90003351 .00033568 00000-0 83563-3 0 9991
2 12139 82.9330 267.6159 0260145 94.5203 268.5793 15.12094438318335Epoch: 2026-04-02T21:36Z
TLE epoch observation values (Epoch: 2026-04-02T21:36:02.895Z)
Latitude
-0.00003°
Longitude
112.36195°
Altitude
542.029 km
Speed
7.586 km/s
True Right ascension
17h 50m 27s
True Declination
0° 00' 00"
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
14:40:39
Azimuth
Unknown
Elevation
Unknown
Doppler factor
Unknown
Orbital elements
Apogee altitude
706.401 km
Perigee altitude
347.145 km
Semi-major axis
6,904.91 km
Eccentricity
0.02601
Inclination
82.933°
RAAN
267.6159°
Arg. of periapsis
94.5203°
True anomaly
265.60291°
Mean anomaly
268.5793°
Eccentric anomaly
267.0907°
Mean motion
3.78274 °/min
Orbital period
95.17 mins
BSTAR
0.00083563
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Other satellites on launch #3 in the year 1981 (1981-01-16 UTC)
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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 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. |
|---|---|---|---|---|---|---|---|
| 5 mins | 2026-04-03 12:01:18.066Z | 162.2° S | 2026-04-03 12:04:18.066Z | 79.257° E | 32.282° | 2026-04-03 12:06:18.066Z | 27.752° NE |
| 5 mins | 2026-04-03 23:34:18.066Z | 350.328° N | 2026-04-03 23:36:18.066Z | 258.523° W | 44.76° | 2026-04-03 23:39:18.066Z | 176.592° S |
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 |
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CAUTION: Conjunctions in this section are generated from low-fidelity TLE screenings
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