Re: Ready to image candidate variable stars with a cookbook CB245 CCD

["Tom & Lou Krajci" <krajcit@3lefties.com>]

-----Original Message-----
From: Albertson, Chris <CAlbertson@primeadvantage.com>
To: 'Tom & Lou Krajci' <krajcit@3lefties.com>; tass@listserv.wwa.com
<tass@listserv.wwa.com>
Date: Monday, December 18, 2000 10:52 AM
Subject: RE: Ready to image candidate variable stars with a cookbook CB245
CCD


>
>
>How about shooting a random star field and posting the
>FITS image file some place.

Well, I don't have a web site or ftp site, but tonight I hope to shoot more
fields (wind advisory is not in effect tonight) and tomorrow I can figure
out where to post/email a sample image or two.  Any and all feedback on
quality/performance of my images is appreciated.  The images will be raw,
dark, flat, and flat-dark.


>The CB245 has not-square pixels.  (1) I wonder which is the best
>way to orient the CCD.  Long dimension east/west so periodic
>error will be hidden?  (2) Does the usual centrioding software
>"know" about not-square pixels?  (3) Can you use a round
>aperture for photometry?  The PSF will not be round.


Once I get some proper image processing software I can resample the images
to address the not-square pixel issue...at least that's what I'm hoping I
can do without sacrificing photometric accuracy.  For now I'm orienting the
CCD chip in 'landscape mode'...long physical dimension in the E-W
direction....makes it easier to interpret what I see on the computer screen
and move the scope about to center desired objects.

Tom Krajci