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

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

Chris,

>How about shooting a random star field and posting the
>FITS image file some place.  That would allow us to
>
>1) See just how good the CB245 images are. Measure the PSF
>and so on....
>
>2) See if we can't run your CB245 data through the same
>data reduction pipeline as we use for Mk IV data and if not
>start figuring out how....

OK, I took some images tonight that are probably representative of the
system's performance with one exception...frost was forming/sublimating on
the chip, so the frost artifacts won't flat field out properly.  (I will run
the camera several degrees warmer to avoid this problem in the future.)
Telescope focal length is approx. 2900mm, aperture is 280mm.  (A Celestron
C-11 at about f/10)

I have some star images, some darks of the same exposure time and temp (2
minutes at -42C), some flats (5 seconds) and some flat darks.  (I took
multiples of all types to see how median combining the frames will help beat
down the noise in the images).

I don't have a website, but I can email you some of these images.  Each FITS
file is about 180K, but they .zip smaller than that.  How many of what kind
do you want me to send to you?

Hope this helps,
Tom Krajci