Name

       scat - Find catalog stars in a square or circle on the sky

Synopsis

       scat [options] [-b or -j] ra dec

Description

       scat  is a utility for finding all of the Hubble Space Telescope Guide Star Catalog (GSC),
       U.S. Naval Observatory A2.0 (UA2), B1.0 (UB1), SA2.0 (USA2),  or  UJ  (UJC)  Catalogs,  or
       locally  catalogued  objects  in  a  specified  region  of  the  sky and listing their sky
       coordinates to standard output. If the -w  flag  is  set,  they  are  written  to  a  file
       objectname.catalogname,  where  objectname  is  given by the argument to -o on the command
       line, defaulting to "search", and catalogname 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 rgsc(1) and star(1), which can search from lists of coordinates but cannot  sort
       the output.  sgsc, suac, and susac are links to this program.1

Options

       -a     List the single closest catalog source

       -b <RA> <Dec>
              Output B1950 (FK4) coordinates around this center

       -c <name>
              Reference   catalog   (gsc(=HST  GSC),  ua2(=USNO-A2.0),  TMC(=2MASS  Point  Source
              Catalog), gsc2(=GSC II), ub1(=USNO-B1.0), local file, etc.)

       -d
               Output RA and Dec in degrees instead of hh:mm:ss dd:mm:ss

       -e     Output ecliptic coordinates

       -f     Output search center for other programs

       -g <class>
              HST Guide Star Catalog object class (0=stars 3=galaxies -1=all)

       -h     Print search and column heading, else do not

       -i     Print catalog object name, not catalog number

       -j <RA> <Dec>
              Output J2000 (FK5) coordinates around this center

       -k <keyword>
              Add value of this keyword to end of output lines from a tab table search

       -l     Print search center and closest star on one line

       -m [<bright magnitude>] <faint magnitude>
              Limiting catalog magnitude(s) (default none, bright -2 if only faint is given)

       -n <num>
              Number of brightest stars to print

       -o <name>
              Object name used for output file naming

       -q <year>
              Equinox of output position in fractional years

       -r <radius>
              Halfwidth (-radius if negative) of search area in arcseconds (default 10)

       -s d|m|n|p|r
              Sort by (d)eclination, (m)agnitude, (n)o sort, (p)distance from center, or  (r)ight
              ascension.

       -t     Tab table to standard output or file

       -u <x> <y>
              Print  x y instead of number in front of non-tab output, before RA and Dec or add x
              and y columns to end of tab output line

       -v     Verbose listing of processing intermediate results

       -w     Write output file objectname.catalog or search.catalog if -o is not used.

       -x <type>
              GSC object type (0=stars 3=galaxies -1=all -2=bands)

       -y <year>
              Epoch of output positions in fractional years (for proper motion only)

       -z     Append to existing output file search.catalog or objectname.catalog.  Start file if
              it does not already exist.

See Also

       imcat()

Web Page

       http://tdc-www.harvard.edu/software/wcstools/scat/

Author

       Doug Mink, SAO (dmink@cfa.harvard.edu)