.TH imstar 1 WCSTools "6 July 2001"
.SH Name
imstar \- Find stars in FITS and IRAF image files
.SH Synopsis
imstar  [options] [FITS or IRAF filename] or [@file of image file names]
.SH Description
.SH Options
.TP
.B <hh:mm:ss> <dd:mm:ss> [J2000, B1950]
Coordinates for center (or reference pixel if \-x is used).
.TP
.B \-a <angle>
Image rotation angle in degrees (default 0).  If multiple of 90, rotate
image before search and set WCS angle to zero; if not, put in WCS.
.TP
.B \-b
Output B1950 (FK4) coordinates (default=image equinox)
.TP
.B \-d <catalog name>
Read this DAOFIND style catalog of X, Y, and magnitude instead of searching
for stars in the image.  The format is simply white-space-separated numbers
on a line, with # at the beginning of comment lines.
.TP
.B \-e <num>
Number of pixels to ignore around image edge 
.TP
.B \-f
Write a simple ASCII catalog file instead of tab table or DAOFIND format
(number RA DEC mag ... per line, with two lines of header info)
.TP
.B \-h
Print heading, else do not 
.TP
.B \-i <num>
Minimum peak value for star in image (<0=-sigma)
Setting this to reject all but 10-15 stars is a good way to speed up the
star-finding process.  If num is less than zero, the minimum peak is \-num
image pixel standard deviations.  Setting this number rejects faint stars
early in the selection process for a significant saving in computing time.
.TP
.B \-j
Output J2000 (FK5) coordinates (default=image equinox)
.TP
.B \-k
Print each star as it is found for debugging 
.TP
.B \-l
Reflect the image left <\-> right before rotating (\-a) and searching for stars.
.TP
.B \-m <magnitude>
Magnitude offset
.TP
.B \-n
Number of brightest stars to print 
.TP
.B \-o
Output star list in DAOFIND format.
The first three numbers on each line of the
output file are X, Y, and magnitude, separated by one or more blanks or
a tab.  Lines beginning with # are ignored.
.TP
.B \-p <num>
Plate scale in arcsec per pixel (default 0)
.TP
.B \-q <c|d|o|s|x|v|+>
Output region file shape for SAOimage (default o)
Characters mean: c>ross, d>iamond, s>quare, o>circle, x=X, v>ary with GSC
type, +>cross.
.TP
.B \-r
Maximum radius for star in pixels 
.TP
.B \-s
Sort by RA instead of flux 
.TP
.B \-t
Output in Starbase tab table format
.TP
.B \-v
Verbose listing of processing intermediate results
.TP
.B \-w
Write output to a file in addition to standard out.
If DAO format (\-o), create the name by adding .dao to the image file name.
If Starbase format (\-t), create the name by adding .tab to the image file name.
If ASCII format (\-f), create the name by adding .stars to the image file name.
.TP
.B \-x <X> <Y>
X and Y coordinates of reference pixel (if not in header or image center)
.TP
.B \-z
Use AIPS classic projection code (for "\-SIN", "\-TAN", "\-ARC", "\-NCP",
"\-GLS", "\-MER", "\-AIT" and "\-STG" only) instead of WCSLIB proposed
standard projection code.

.SH Web Page
http://tdc-www.harvard.edu/software/wcstools/imstar/

.SH Author
Jessica Mink, SAO (jmink@cfa.harvard.edu)