Faint Object Classification and Analysis System (FOCAS) FOCAS The Faint Object Classification and Analysis System, called FOCAS, is a set of programs for creating and manipulating catalogs of objects from digital astronomical images. FOCAS may be used on any type of astronomical image but it was primarily designed for the optimal detection of small faint objects and their classification as stars, galaxies, or noise. It is largely automated for the measurement of large numbers of objects for various statistical studies and so the photometry, astrometry, and classification are of moderate accuracy. FOCAS is not intended for very crowded stellar fields where point spread function fitting methods are more appropriate, or for large bright objects where surface brightness methods apply. Version March, 1998 To use the packages first start IRAF using the 'cl' command and at the 'cl>' prompt type 'focas'. The FOCAS User's Manual is available in two different forms: Postscript files at the IRA web address Manuals in room 307 Contact Person: F.Tinarelli tinarelli@ira.inaf.it