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IRAF Tools Faint Object Classification

Version : 3
Author(s) : Frank Valdes (
License : AURA
Website :

Disk space required for installation is 4.27 Mb


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. The creation of a catalog is accomplished
by an automatic threshold detector where the threshold is measured relative
to a simultaneously determined background. The manipulation of catalogs
includes the separation of merged objects, the measurement of various position,
shape, and photometric parameters, the astronomical classification of the
objects, and the display and analysis of the catalogs. This
paper describes much of the workings of FOCAS with reference
to the FOCAS User's Manual.

ifocas.detect - detect images in a field
ifocas.evaluate - evaluate the objects in a catalog
ifocas.resolution - fit resolution templates and make a classification - evaluate and set the local sky for objects in a catalog
ifocas.splits - separate merged objects


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