WCSTools

scat
Catalog Search Program

WCSTools programs
scat is a utility in the WCSTools package for finding the objects from a specified catalog which are located in a specified region of the sky. By default, only the brightest 100 objects (or closest 100, if the -s p option is used) are returned. Use the -n option to increase this number.

Catalogs which may be searched include those specified below plus locally catalogued objects in the Starbase, simple ASCII, or TDC binary format. By default, the sky coordinates of the selected objects are written to standard output. If the -w flag is set, they are written to a file object_name.catalog_name, where object_name is given by the argument to -o on the command line, defaulting to search, and catalog_name is given by the argument to -c on the command line.

The catalog defaults to the GSC, if no -c argument is present. scat resembles my Fortran programs, rgsc and star, which can search from lists of coordinates but cannot sort the output.

Specific catalogs which can be searched include:
Catalog Command Alias Examples
GSC II Catalog scat -c gsc2 sgsc2 examples
2MASS Point Source Catalog scat -c tmc stmc examples
USNO-A2.0 Catalog scat -c ua2 sua2 examples
USNO-B1.0 Catalog scat -c ub1 sub1 examples
USNO UCAC3 Catalog scat -c ucac3 sucac3 examples
USNO UCAC2 Catalog scat -c ucac2 sucac2 examples
Sloan Digital Sky Survey scat -c sdss ssdss examples
GSC-ACT Catalog scat -c gsca sgsca examples
HST Guide Star Catalog scat -c gsc sgsc examples
USNO-SA2.0 Catalog scat -c usa2 susa2 examples
Tycho 2 Catalog scat -c ty2 sty2 examples
ACT Reference Catalog scat -c act sact examples
SKY2000 Catalog scat -c sky2k ssky2k examples
SAO Catalog scat -c sao ssao examples
PPM Catalog scat -c ppm sppm examples
Bright Star Catalog scat -c bsc sbsc examples
IRAS Point Source Catalog scat -c iras siras examples
SkyBot Solar System Database scat -c skybot sskybot examples
USNO-A1.0 Catalog scat -c ua1 sua1 examples
USNO-SA1.0 Catalog scat -c usa1 susa1 examples

Command Line Arguments

CGI Queries and Parameters

As of version 2.9, scat can be used remotely as a CGI executable.
If you are at the Center for Astrophysics, a GUI front end using scat is online here.

Examples


SAO Telescope Data Center

Last updated 14 September 2010 by Doug Mink