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Astro B (Tenma)

Astro B [ISAS]

The Astro B (renamed Tenma after launch) X-ray astronomy mission had the following major objectives:

  • study of X-ray source spectra with good energy resolution,
  • study of temporal variations of X-ray sources,
  • all-sky survey for X-ray bursts and transients, and
  • observation of soft X-ray sources with a reflecting telescope.

The spacecraft could spin at 0.546, 0.137, or 0.068 rpm with the aid of a momentum wheel. The spin axis was maneuvered by magnetic torquing.

Four experiments were on board of the satellite:

  • Gas Scintillation Proportional Counters
  • Hadamard Transform Telescope
  • All Sky X-Ray Monitor
  • X-Ray Reflecting Telescope
Nation: Japan
Type / Application: Astronomy, X-Ray
Operator: ISAS
Equipment: see above
Power: 4 deployable fixed solar arrays, batteries
Mass: 216 kg
Orbit: 489 km × 503 km, 31.5
Satellite COSPAR Date LS Launch Vehicle Remarks
Astro B (Tenma) 1983-011A 20.02.1983 Ka LP-M M-3S


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