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This X-ray astronomy mission had the following major objectives: (1) study of X-ray source spectra with good energy resolution; (2) study of temporal variations of X-ray sources; (3) all-sky survey for X-ray bursts and transients; and, (4) 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.

Alternate Names

  • 13829
  • Astro-B
  • X-Ray Observation Satellite

Facts in Brief

Launch Date: 1983-02-20
Launch Vehicle: M-3S-3
Launch Site: Uchinoura Space Center, Japan
Mass: 216 kg

Funding Agency

  • Institute of Space and Aeronautical Science, U of Tokyo (Japan)


  • Astronomy

Additional Information

Questions and comments about this spacecraft can be directed to: Coordinated Request and User Support Office



NameRoleOriginal AffiliationE-mail
Prof. Yasuo TanakaProject ManagerInstitute of Space and Aeronautical Science
Dr. Jun NishimuraProject ScientistInstitute of Space and Aeronautical

Other Sources of Tenma Information/Data

Tenma page at HEASARC

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