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Rotation Modulation Collimator (RMC)

NSSDCA ID: 1974-077A-01

Mission Name: Ariel 5
Principal Investigator:Sir Robert L. F. Boyd


This experiment combined the function of observing X rays in different energy ranges with that of star tracking. The experiment contained a rotation collimator, utilizing the satellite spin, behind which there were three detectors. The field of view was a cone with a half-angle of 10 deg to 20 deg, depending on the type of radiation viewed by the different detectors. The three detectors functioned as follows: (1) a visible-light photomultiplier enabled the spin axis to be accurately determined by viewing the background of optical stars; (2) an array of channel electron multipliers, with selectable filters, covered the wavelength range 0.3 to 6 keV; (3) a group of proportional counters covered the range 2.5 to 30 keV. It was estimated that source positions could be determined to within 2 arc min for bright sources.

Alternate Names

  • 0.3-30 KeV X-Ray Rotation Collimator
  • Ariel5/RMC
  • RMC

Funding Agency

  • Unknown (United Kingdom)


    Additional Information

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



    NameRoleOriginal AffiliationE-mail
    Mr. P. W. SanfordOther InvestigatorUniversity College, London
    Prof. A. Peter WillmoreOther InvestigatorUniversity of
    Sir Robert L. F. BoydPrincipal InvestigatorUniversity College, London
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