This is the command build-astrometry-index that can be run in the OnWorks free hosting provider using one of our multiple free online workstations such as Ubuntu Online, Fedora Online, Windows online emulator or MAC OS online emulator
PROGRAM:
NAME
build-astrometry-index - Create astrometry.net index files
SYNOPSIS
build-astrometry-index [options] -i catalog -o file -P scale
DESCRIPTION
build-astrometry-index takes a FITS catalog table containing at least RA, DEC, and
magnitude columns and converts it into an index file that can be used by the
astrometry.net programs like solve-index (1).
OPTIONS
-i catalog
Input FITS catalog: source RA,DEC, etc.
-e extension
FITS extension to read when -i is specified.
-1 index
Share another index's stars (alternatively to -i/-e).
-o file
Output filename for index
-N nside
Healpix Nside for quad-building
-l size
Minimum quad size (arcminutes)
-u size
Maximum quad size (arcminutes)
-P number
Use 'preset' values for -N, -l, and -u. The scale-number is the last two digits of
the pre-cooked index filename -- eg., index-205 is -P 5.
-P 0 should be good for images about 6 arcmin in size and it goes in steps of
sqrt(2), so:
-P 2 should work for images about 12 arcmin across
-P 4 should work for images about 24 arcmin across
-P 6 should work for images about 1 degree across
-P 8 should work for images about 2 degree across
-P 10 should work for images about 4 degree across etc... up to -P 19
-S column
Sort column (default: assume the input file is already sorted)
-f Sort in descending order (eg, for FLUX); default ascending (eg, for MAG)
-A column
Specify the RA column name in the input FITS table (default "RA")
-D column
Specify the Dec column name in the input FITS table (default "Dec")
-B val Cut any object whose sort-column value is less than val; for mags this is a bright
limit
-U Healpix Nside for uniformization (default: same as -n)
-H big healpix
Big healpix; default is all-sky
-s Nside
Big healpix Nside; default is 1
-m margin
Add a margin of margin healpixels; default 0
-n sweeps
Sweeps (ie, number of stars per fine healpix grid cell); default 10
-r radius
Deduplication radius in arcseconds; default no deduplication
-j jitter
Positional error of stars in the reference catalog (in arcsec; default 1)
-d dimquads
Number of stars in a "quad" (default 4).
-p passes
Number of rounds of quad-building (ie, number of quads per healpix cell, default
16)
-R reuse
Number of times a star can be used (default: 8)
-L max-reuses
Make extra passes through the healpixes, increasing the -r reuse limit each time,
up to max-reuses.
-E Scan through the catalog, checking which healpixes are occupied.
-I id Set the unique ID of this index
-M In-memory (don't use temp files)
-T Don't delete temp files
-t dir Use this temp directory (default: /tmp)
-v Add verbosity.
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