Re: [APML] Pelican with my new HX916

["Paul M. Rybski" <rybskip@idcnet.com>]

>Hi all,
>
>Yes, it's true, I couln`t resist to the temptetions of the CCD 
>world. I got a good offer for a used starlight HX916 and now I have 
>a lot to learn. The first test shots gave me a good feeling. I made 
>single 10 min shots through my VC200L without any darks or flats. 
>All guided with my ST4 through the guide scope.
>
>M57, 10 min at f/9 1800mm:
><http://www.inode.at/wasshuber/m57-1800.jpg>http://www.inode.at/wassh 
>uber/m57-1800.jpg
>
>M13, 10 min at f/6.3, 1280mm:
><http://www.inode.at/wasshuber/m13-1280.jpg>http://www.inode.at/wassh 
>uber/m13-1280.jpg
>
>Now I've just uploaded a picture of the pelican nebula. It was done 
>with my HX916 through the 6"-Newton f/4.3. I did three images for 20 
>minutes with a Ha-pass filter from Lumicon. This is the filter for 
>film imaging and it has no infrared blocking. So more light will 
>pass than with a Ha-band pass filter. No darks, no flats. Some hot 
>pixels I removed by hand.
>
>The color information came from an older film image, with the same 
>Telescope on KODAK E 200. You can this image on my homepage at: 
><http://www.inode.at/wasshuber/gallery/pelikan-1.htm>http://www.inode. 
>at/wasshuber/gallery/pelikan-1.htm
>
>The combined image with the CCD-luminance:
><http://www.inode.at/wasshuber/ccd1-pelikan.jpg>http://www.inode.at/w 
>asshuber/ccd1-pelikan.jpg
>
>Comment are wellcome,
>Manfred
><http://www.astroimages.at>http://www.astroimages.at
>
>
>
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Dear Manfred,

      Your image is lovely.  What really caught my attention were the 
ionization fronts in the upper right portion of your image.  These 
would look spectacular at your longer focal length, at the expense , 
of course, of seeing the entire Pelican.

      One question, though:  some brighter star images in the upper 
left and lower middle of this image show different kinds of 
asymmetry.  It doesn't look like coma, astigmatism or field rotation. 
Any idea what it is?

Paul


________________________________________
Paul M. Rybski, Ph.D.
Associate Professor and former Chair, Dept. of Physics, and
Director, Whitewater Observatory
Goodhue 320
University of WI-Whitewater
Whitewater, WI  53190-1790

Office FAX:     (262) 472-5633
Email address:  rybskip@uww.edu
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