Absolute surface brightness photometry with ISOPHOT

P. Héraudeau, P. Ábrahám, U. Klaas, C. Del Burgo

Research output: Contribution to journalConference article


The cold ISO telescope has allowed absolute sky brightness measurements to be carried out, making it possible to contribute to studies of the zodiacal light and the extragalactic background light. In this paper we discuss the evaluation scheme of such measurements performed with ISOPHOT, with special emphasis on the determination of the photometric zero point. After reviewing the current knowledge on the related calibration aspects, such as dark signal, bypassing sky light and correction for non-standard apertures of PHT-P, we define the remaining open calibration issues, and make some comments on the final expected photometric accuracy.

Original languageEnglish
Pages (from-to)99-102
Number of pages4
JournalEuropean Space Agency, (Special Publication) ESA SP
Issue number481
Publication statusPublished - May 1 2003
EventThe Calibration Legacy of the ISO Mission - madrid, Spain
Duration: Feb 5 2001Feb 9 2001



  • Infrared: general
  • Instrumentation: photometers
  • Space vehicles: instruments
  • Techniques: photometry

ASJC Scopus subject areas

  • Aerospace Engineering
  • Space and Planetary Science

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