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SAS-C

NSSDCA/COSPAR ID: 1975-037A

Description

SAS-C was the third in the series of small spacecraft whose objectives were to survey the celestial sphere for sources radiating in the X-ray, gamma-ray, UV, and other spectral regions. The primary missions of SAS-C were to measure the X-ray emission of discrete extragalactic sources, to monitor the intensity and spectra of galactic X-ray sources from 0.2 to 60 keV, and to monitor the X-ray intensity of Scorpio X-1.

The spacecraft was launched from the San Marco platform off the coast of Kenya, Africa, into a near-circular, equatorial orbit. This spacecraft contained four instruments: the Extragalactic Experiment, the Galactic Monitor Experiment, the Scorpio Monitor Experiment, and the Galactic Absorption Experiment. In the orbital configuration, the spacecraft was 145.2 cm high and the tip-to-tip dimension was 470.3 cm. Four solar paddles were used in conjunction with a 12-cell nickel-cadmium battery to provide power over the entire orbit. The spacecraft was stabilized along the Z axis and rotated at about 0.1 deg/s. Changes to the spin-axis orientation were by ground command, either delayed or in real time. The spacecraft could be made to move back and forth plus or minus 2.5 deg across a selected source along the X axis at 0.01 deg/s. The experiments looked along the Z axis of the spacecraft, perpendicular to it, and at an angle.

Alternate Names

  • 07788
  • PL-743D
  • SAS 3
  • Explorer 53
  • Small Astonomical. Satellite 3

Facts in Brief

Launch Date: 1975-05-07
Launch Vehicle: Scout
Launch Site: San Marco Platform, Kenya
Mass: 196.7 kg
Nominal Power: 65 W

Funding Agency

  • NASA-Office of Space Science (United States)

Discipline

  • Astronomy

Additional Information

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

 

Personnel

NameRoleOriginal AffiliationE-mail
Mr. John R. HoltzProgram ManagerNASA Headquarters
Dr. James E. Kupperian, Jr.Project ManagerNASA Goddard Space Flight Center
Dr. Carl E. FichtelProject ScientistNASA Goddard Space Flight Centerfichtel@lheavx.gsfc.nasa.gov
Dr. Nancy G. RomanProgram ScientistNASA Headquarters

Related Information/Data at NSSDCA

Uhuru (SAS-A)
SAS-B

US Active Archive for SAS-C Information/Data

The SAS-3 Archive at HEASARC

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