This SAOimage display shows the alignment of
GSC-ACT stars with a test image after a
world coordinate system has been fit. The coordinates plotted are based
on header keywords describing a plane-tangent system fit by matching HST
Guide stars and sources found in the image.
This image was produced by a one-line Unix shell script for this task,
saoimage -reg `imgsc2 -r 10 $1` -wcscom sgsc2_-ha_%s $1where the argument to the task is the name of the file to be displayed.
The immatch program can provide a list of the stars in the image which match catalog stars.
|Click on the image for full-screen view|
imgsc2 finds all of the
GSC-ACT stars in the image based on
the world coordinate system parameters in its header and writes them to the
region file testx90mw.fits.gsc2, seen on the right.
The name of this file is sent to standard output which the backquotes give to SAOimage as a command line argument following the -reg command.
# GSC 2.2 (10" radius) CIRCLE(526,447,16) # gsc2 N1322311422 CIRCLE(738,763,16) # gsc2 N1322311398 CIRCLE(662,661,16) # gsc2 N1322311404 CIRCLE(284,619,16) # gsc2 N1322311410 CIRCLE(529,33,16) # gsc2 N1322311440 . . . CIRCLE(976,418,16) # gsc2 N132231113128 CIRCLE(299,207,16) # gsc2 N132231112796 CIRCLE(312,52,16) # gsc2 N132231112544 CIRCLE(675,783,16) # gsc2 N132231113866 CIRCLE(513,673,16) # gsc2 N132231113622
sgsc2 2.9.4, 29 June 2001, Doug Mink SAO Find closest star gsc2 16:15:56.306 +31:24:24.82 J2000 r= 120.00 at epoch 2000.00 GSC II number RA2000 Dec2000 MagF MagJ MagV MagN Arcsec N1322311422 16:15:56.179 +31:24:24.56 10.70 11.00 99.90 99.90 1.64