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Re: Least square fitting [message #60492 is a reply to message #60326]

Tue, 20 May 2008 14:48

Marshall Perrin
Messages: 44
Registered: December 2005

Member

MichaelT <michael.theusner@googlemail.com> wrote:
> Hi all,
>
> I have a problem with a rather complicated function depending on four
> parameters which I try to find using least square fitting and I don't
> know exactly how to do it.
>
> The basic problem is the following:
> I have an astronomical image of a star field and try to relate the sky
> coordinates (right ascension, declination) of the stars to the pixel
> coordinates (x, y).

So if you truly wish to know how to properly solve this particular
mathematical problem, I will leave that to other wiser experts to
answer.

If, however, what you really want is just to know the astrometric
solution for your data, you may be interested to know about
Astrometry.net, a research project by David Hogg at NYU and
collaborators which intends to solve this particular problem once and
for all, for everyone. You feed their web service arbitrary
astronomical images, and it hands back the astrometric solution. I've
not tried it for images as wide-field as you have, but I suspect it
will work just fine. See http://astrometry.net/ for more info.

- Marshall

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[Message index]

		Least square fitting By: MichaelT on Tue, 20 May 2008 02:41
		Re: Least square fitting By: MichaelT on Wed, 21 May 2008 01:45
		Re: Least square fitting By: Bringfried Stecklum on Wed, 21 May 2008 00:47
		Re: Least square fitting By: Marshall Perrin on Tue, 20 May 2008 14:48
		Re: Least square fitting By: MichaelT on Tue, 20 May 2008 11:44
		Re: Least square fitting By: wlandsman on Tue, 20 May 2008 10:28

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