ASTRA 1B, 21139
Orbit data source: Space-Track
ASTRA 1B, 21139 is a payload satellite owned by SES (LU) in GEO that was launched on Sat, 02 Mar 1991 UTC via an ARIANE 44LP launch vehicle from the French Guiana (FRGUI). Payload-class satellites include a variety of spacecraft equipped with specific instruments for various scientific and technological missions. These include communications satellites like Starlink; space stations such as the ISS; scientific satellites like the Hubble; Earth observation satellites from companies like Planet Labs, Umbra, and HawkEye 360; GPS; miniature CubeSats for education and research; and military/defense satellites.
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21139 intel report (Beta)
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Identifier
Orbit
Country
LU / SESRelated business
Manufacturer
GE/East Windsor
Mission
Non-operational Commercial Communications
Bus & Motor
AS5000, 2X LEROS 1
Mass
2,580 kg wet, 1,177 kg dry
Launch date (UTC)
Launch vehicle
Launch site
Object type
Shape & HBR
Hex Poly + 2 Pan, 12.2 m
Radar Cross Section
18.796 m², Large (>1 m²)
Expand to show TLE details & historyLast TLE update: 1 day ago
TLE from 1 day ago
0 ASTRA 1B
1 21139U 91015A 26296.55427354 -.00000227 00000-0 00000-0 0 9994
2 21139 13.5261 21.2500 0004689 348.3831 24.1616 0.98512761117551Epoch: 2026-10-23T13:18Z
TLE epoch observation values (Epoch: 2026-10-23T13:18:09.233Z)
Latitude
2.91996°
Longitude
161.9318°
Altitude
36,267.895 km
Speed
3.058 km/s
True Right ascension
02h 13m 46s
True Declination
2° 55' 01"
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
08:43:25
Azimuth
Unknown
Elevation
Unknown
Doppler factor
Unknown
Orbital elements
Apogee altitude
36,308.016 km
Perigee altitude
36,268.004 km
Semi-major axis
42,666.147 km
Eccentricity
0.00047
Inclination
13.5261°
RAAN
21.25°
Arg. of periapsis
348.3831°
True anomaly
24.1836°
Mean anomaly
24.1616°
Eccentric anomaly
24.1726°
Mean motion
0.24627 °/min
Orbital period
1,461.79 mins
BSTAR
0
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Other satellites on launch #15 in the year 1991 (1991-03-02 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.ASTRA 1B Visibility
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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. |
|---|---|---|---|---|---|---|---|
| ASTRA 1B is likely not visible in the next few days. |
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21139 neighbors
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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
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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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 |
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