| Re: Least square fitting [message #60519 is a reply to message #60324] |
Tue, 20 May 2008 07:06  |
MichaelT
Messages: 52
Registered: May 2006
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Thanks for your thoughts, Chris!
But I think the field of view is not small enough to do it this way
(about 3.5° x 2.5° and larger). The focal length is shorter than 400
mm. Otherwise, it could very well work the way you described it, I
think.
These are the things I'd like to do in the end:
I have several images of the same object, but from different nights
taken with an amateur instrument. So the fov is slightly different
each time as well as the rotation angle (it's not a stationary scope).
Knowing all the parameters would enable me to exactly overlay the
images to increase the signal-to-noise ratio. I know that there are
various free programs (non-IDL) that can already do that, but they all
have some shortcomings. So I tried to do something myself.
Also, you could then use some neat routines from the IDL astronomy
library (http://idlastro.gsfc.nasa.gov/) and automatically generate an
overlay from the USNO catalog to determine the limiting magnitude or
to label objects (e.g. queryvizier and querysimbad).
There are many other things you could do if you knew the pixel-to-
coordinate conversion.
Michael
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