ASTRA 1B

About This Satellite

ASTRA 1B is listed as a payload under NORAD ID 21139 with international designator 1991-015A. According to the GCAT master catalog, it was built by GEEW, on the AS5000 platform, with a catalog mass of 2580 kg, with a shape described as Box + 2 Pan. It is associated with Luxembourg, Grand Duchy of. In the historical build snapshot (TLE epoch 2026-09-04), its HEO orbit had an apogee of about 36,309 km and a perigee near 36,267 km, with an inclination of 13.47° and a period of roughly 1461.8 minutes; at apogee its speed was about 3.06 km/s. It was launched on 1991-03-02. The build snapshot uses a TLE with epoch 2026-09-04. A moving map, when available, is a prediction rather than a direct measurement.

What this identity tells us

The payload classification comes from GCAT record S21139. A catalog identifier follows a tracked physical object, not necessarily an active service. Manufacturer and owner entries describe catalog associations; ownership is not interchangeable with present-day operation. A separately sourced mission history has not yet been verified for this record.

Reading this orbital snapshot

Based on TLE epoch: 2026-09-04. Estimated altitude ranges from 36,267 km at perigee to 36,309 km at apogee, a difference of 43 km. The orbital period is about 1461.8 minutes. Eccentricity 0.00050 indicates a nearly circular path. In a two-body approximation, perigee speed is 1.00 times apogee speed. These are mean-element estimates, not instantaneous measurements. Distance per orbit uses an ellipse approximation.

Saved build snapshot. If a valid TLE is retrieved, this explanation and the orbit panel update together. Otherwise this dated snapshot is retained.

Ground track is not sensor coverage

An inclination of 13.47 degrees implies approximate geocentric ground-track limits of 13.5 degrees north and south. This is a prograde orbit, moving in the same general direction as Earth rotation. The plotted line marks the point beneath the object. It does not represent camera coverage, radio reception, or a guaranteed visible pass.

Is it fixed above one longitude?

The snapshot period is 1461.8 minutes. A sidereal day is about 1,436.07 minutes. Height alone does not establish a geostationary orbit: the period must match Earth rotation and the path must be circular and equatorial. This catalog uses a five-minute period tolerance for near-geosynchronous labels; near-geostationary additionally requires inclination at most 1 degree and eccentricity at most 0.01. These are browsing categories, not evidence of station-keeping or a fixed longitude.

Accuracy and missing information

The introductory record describes the build snapshot. The orbital snapshot explanation and orbit panel share any successfully retrieved TLE; check the displayed epoch. Reentered objects retain historical data only. Mission history is not rewritten by TLE updates. TLE/SGP4 positions are predictions and can change after maneuvers or updated observations. The 14-day stale-data cutoff is a display safeguard, not an accuracy guarantee. Local passes are geometric predictions, not a visibility forecast. No verified operator or mission status means unknown, not active. Do not use this catalog for collision avoidance or operational flight decisions.

Catalog sources: CelesTrak SATCAT: NORAD 21139 · GCAT: S21139 (source update 2026 Sep 4 2345:57). Supplementary metadata: SatNOGS DB, retrieved 2026-09-05T12:57:25.375Z. Page assembled 2026-09-15. GCAT phase codes describe trajectory phases, not mission health.

Learn more: TLE data · Perigee and apogee · Ground tracks · JOT (Jewawud Live Orbital Map)

Satellite Details