The de-censoring of the faint stars in Tycho photometry

J. L. Halbwachs, T. Di Méo, M. Grenon, V. Großmann, E. Høg, A. Wicenec

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2 Citations (Scopus)


The Tycho catalogue provides astrometric and photometric data for more than 1 million stars. The derivation of the mean magnitudes of stars fainter than about 8 mag required a dedicated treatment, in order to take into account the observations that were too faint for providing a measurable signal. This treatment, called "de-censoring", is based on a statistical model permitting to substitute mean values to the missing data. Faint photometric standard stars are used to demonstrate that the de-censoring produces reliable magnitudes and uncertainties.

Original languageEnglish
Pages (from-to)360-366
Number of pages7
JournalAstronomy and Astrophysics
Issue number1
Publication statusPublished - 1 Sept 1997
Externally publishedYes


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