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UV Telescope

NSSDCA ID: 1974-070A-01

Mission Name: ANS
Principal Investigator:Dr. R. J. Van Duinen


The ultraviolet five-band photometer of ANS consisted of a Cassegrain telescope followed by a grating spectrometer of the Wadsworth type. The telescope primary mirror had a diameter of 22.5 cm and a light-collecting surface of 266 sq cm. A rectangular slit in the focal plane of the telescope provided a field of view of 2.5 sq arc-min to the photometer. The curved refraction grating of the spectrometer had five fixed slits in its focal surface. The position and width of these slits determined the central wavelength and wavelength range of the passbands. The five passbands, which did not overlap, had central wavelengths from 1545 A to 3294 A. The transmitted light reached photomultipliers--one behind each slit--that were used in a pulse-counting mode. The instrument was sensitive to stars as faint as apparent visual magnitude +11. The primary aim of the experiment was to measure the absolute intensities of a large number of objects in the five passbands and, thus, to make possible a better classification of hot stars. For additional details, see J. W. G. Aalders, et al., Philips Tech. Rev., v. 34, p. 33, 1974.

Alternate Names

  • ANS/UVTelescope

Facts in Brief

Mass: 17.5 kg
Power (avg): 3.5 W

Funding Agency

  • Unknown (The Netherlands)


  • Astronomy: Ultraviolet

Additional Information

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



NameRoleOriginal AffiliationE-mail
Prof. Jan BorgmanOther InvestigatorRijksuniversiteit Groningen
Dr. R. J. Van DuinenPrincipal InvestigatorRijksuniversiteit Groningen
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