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Scorpio Monitor Experiment (SME)

NSSDCA ID: 1975-037A-03

Mission Name: SAS-C
Principal Investigator:Dr. George W. Clark


A 12- by 50-deg FWHM slat collimator was oriented with its long axis perpendicular to the satellite spin axis such that a given point on the sky could be monitored for about 25% of a rotation. This collimator was inclined by 31 deg with respect to the equatorial plane of the satellite, so that Scorpio X-1 was observed while the Z axis was oriented to the Virgo cluster of galaxies. The detectors used in this experiment were proportional counters with 1-mm beryllium windows. The energy range was from 1.0 to 60 keV, and the total effective area was about 40 sq cm.

Alternate Names

  • SME

Facts in Brief

Mass: 75.3 kg
Power (avg): 17.5 W

Funding Agency

  • NASA-Office of Space Science (United States)


  • Astronomy: X-Ray

Additional Information

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



NameRoleOriginal AffiliationE-mail
Dr. Robert W. RascheGeneral ContactMassachusetts Institute of
Dr. Hale V. BradtOther InvestigatorMassachusetts Institute of
Dr. Walter H. G. LewinOther InvestigatorMassachusetts Institute of
Dr. Herbert W. SchnopperOther InvestigatorDanish Space Research Institute
Dr. George W. ClarkPrincipal InvestigatorMassachusetts Institute of
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