This SAOimage display shows the alignment of
USNO UCAC2 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 `imucac2 -r 10 $1` -wcscom sucac2_-ha_%s $1where the argument to the task is the name of the file to be displayed.
The immatch program will provide a list of the stars in the image which match catalog stars.
|Click on the image for full-screen view|
imucac2 finds all of the
USNO UCAC2 Stars in the image
based on the world coordinate system parameters in its header and writes
them to the region file
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.
# USNO UCAC2 Catalog Stars (10" radius) CIRCLE(737,763,16) # ucac2 243.072534 CIRCLE(661,661,16) # ucac2 243.072535 CIRCLE(960,978,16) # ucac2 244.071712 CIRCLE(283,620,16) # ucac2 243.072550 CIRCLE(948,475,16) # ucac2 243.072529 . . . CIRCLE(230,196,16) # ucac2 243.072555 CIRCLE(607,773,16) # ucac2 243.072537 CIRCLE(18,666,16) # ucac2 243.072565 CIRCLE(986,507,16) # ucac2 243.072527 CIRCLE(209,861,16) # ucac2 243.072558
sucac2 3.5, 22 August 2003, Doug Mink SAO Find closest star ucac2 16:15:56.174 +31:24:23.36 J2000 r= +00:15:00.0 at epoch 2000.0000 UCAC2_num RA2000 Dec2000 MagJ MagH MagK MagC Arcsec 243.072538 16:15:52.975 +31:25:15.55 13.72 13.29 13.23 14.78 66.34