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ASTSCRIPT-ZEROPOINT(1)		  User Commands 	  ASTSCRIPT-ZEROPOINT(1)

NAME
     astscript-zeropoint - Estimate zero point of an image

SYNOPSIS
     astscript-zeropoint [OPTIONS] image.fits

DESCRIPTION
     Calculate	the  Zeropoint of the image based on a reference images or cata-
     log.

   astscript-zeropoint options:
	    Input(s):

     -h, --hdu=STR/INT
	    HDU/Extension name or number of input.

     -S, --starcat=STR
	    Catalog with positions for aperture photomery.

     --starcathdu=STR/INT
	    HDU of table in '--starcat'.

     --starcatra=STR/INT
	    Column in '--starcat' that contains RA.

     --starcatdec=STR/INT
	    Column in '--starcat' that contains DEC.

     --mksrc=STR
	    Makefile (for developers when debugging).

	    Output:

     -o, --output
	    Output file name.

     -t, --tmpdir
	    Directory to keep temporary files.

     -k, --keeptmp
	    Keep temporal/auxiliar files.

     -K, --keepzpap
	    Keep each aperture's zp in a different HDU.

	    General settings

     -a, --aperarcsec=FLT[,FLT]
	    Aperture radius (in arc-seconds) for photometry.

     -M, --magnituderange=FLT,FLT Range of the magnitude to be considered.

	    Reference catalog mode

     -c, --refcat=STR
	    Reference catalog file name.

     -C, --refcathdu=STR/INT
	    Reference catalog HDU name of number.

     -r, --refcatra=STR
	    Reference catalog Right Ascension (R.A.) column.

     -d, --refcatdec=STR
	    Reference catalog Declination (Dec) column.

     -m, --refcatmag=STR
	    Reference catalog Magnitude column.

     -s, --matchradius=FLT
	    Radius (in arcsec) to match with reference.

	    Reference image mode

     -R, --refimgs=STR[,STR]
	    Reference image name(s) with known zeropoint.

     -H, --refimgshdu=STR/INT
	    Reference image HDU name(s) or number (s).

     -z, --refimgszp=FLT[,FLT]
	    Zero point(s) of the reference image(s).

	    Operating mode:

     -h, --help
	    Print this help.

     --cite
	    BibTeX citation for this program.

     -q, --quiet
	    Don't print any extra information in stdout.

     -V, --version
	    Print program version.

     -N, --numthreads=INT
	    Number of threads; maximum if not given.

     Mandatory or optional arguments to long options are also mandatory  or  op-
     tional for any corresponfing short options.

     GNU Astronomy Utilities home page: http://www.gnu.org/software/gnuastro/

REPORTING BUGS
     Report bugs to bug-gnuastro@gnu.org

COPYRIGHT
     Copyright (C) 2022-2025 Free Software Foundation, Inc.  License GPLv3+: GNU
     General public license version 3 or later.
     This  is  free software: you are free to change and redistribute it.  There
     is NO WARRANTY, to the extent permitted by law.

     Written/developed by Sepideh Eskandarlou et al.

SEE ALSO
     The full documentation for astscript-zeropoint is maintained as  a  Texinfo
     manual.   If  the	info  and  astscript-zeropoint programs are properly in-
     stalled at your site, the command

	    info astscript-zeropoint

     should give you access to the complete manual.

GNU Astronomy Utilities 0.24	  November 2025 	  ASTSCRIPT-ZEROPOINT(1)

Want to link to this manual page? Use this URL:
<https://man.freebsd.org/cgi/man.cgi?query=astscript-zeropoint&sektion=1&manpath=FreeBSD+Ports+15.1.quarterly>

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