RE: How to match to catalog using Mike Gutzwiller's star.exe?

[mgutzwiller@lanvision.com]

I took a look at this image myself and also got the match failure with the
default settings for star.  The cure was to change the setting or "Number of
stars to match" to 40.  This image was deep in the Milky Way (RA = 102 -
105) which probably confused the match algorithm.
 
As for dark and flat vectors I used Tom's dark image (d0500244.fts) and my
dark program to create the dark vector and the image itself to generate a
flat vector with my flat program.
 
 
Thanks,
 
Mike Gutzwiller

-----Original Message-----
From: John Phillips [mailto:jdp@indy.net]
Sent: Sunday, February 28, 1999 6:49 AM
To: tass@wwa.com
Subject: How to match to catalog using Mike Gutzwiller's star.exe?


I have been trying to reproduce the published results of analysis for the
Mark III image g0493669.fts using Mike Gutzwiller's star.exe for windows
98.  I have written a simple little program to extract a dark and flat
vector from the image since these haven't been published.  (Dark is the
minimum from each column and flat is the average from each column.  Dark
seems OK, flat is problematic).  I am using the (recommended) tycho.cat
catalog file.  Everything seems to go well, except that in the output file
(x0a_3669.fts) I see the message "match to catalog failed, using Ra and Dec
from fits header."
 
I have experimented with the Sao and tyc_good catalog files, but I think I'm
on the wrong track there, I just get the same results.
 
Does anyone have any helpful hints?
 
John Phillips
jdp@indy.net