View Full Version : NGC 891 -- Two years ago and Recent

2006-Dec-05, 05:17 AM
I took some more data a couple of weeks agod and created a new version
of my image of NGC 891, a spiral galaxy in Andromeda (http://obsballona.net/coppermine/displayimage.php?pos=-43). The underlying
images (or data if you will) was taken on December 18, 2004 and
November 17 2006. What I have in the image is 5 hours 5 minutes of
actual exposure, and 7 hours 20 minutes effective exposure. This
"effective exposure" is because one hour and 15 minutes of color data
is included in the luminance, or non-color part of the image.

I figured that since my older color data was binned that I would
re-use the newer, unbinned color data in the luminance. The newer
data was imaged through a Hutech LPR filter.

The combined Luminance is 260 minutes of exposure, the RGB 60 minutes
each, processed with Maxim DL, CCDStack, and Photoshop, using
GradientXterminator. Luminance combined from clear, luminance, and
RGB filters unbinned.

Here is a link the the image.

Thanks for looking. All comments welcomed.


2006-Dec-05, 12:49 PM
Beautiful, Andy!! Great work, precision and dedication. I can only dream of creating such a masterpiece!
Thanks for sharing.

2006-Dec-05, 05:28 PM
A great combination of new and old data sometimes it becomes usefull, a great effort on your behalf, a crisp and beautiful image.

2006-Dec-10, 01:13 AM
Thanks for the kind comments...

Dragon Star
2006-Dec-10, 01:15 AM
Nice shot, great detail in those arms.

2006-Dec-10, 02:04 AM
I've been reading Scott Ireland's Photoshop Astronomy (http://www.willbell.com/CCD/photoshop_astronomy.htm), and I could not resist making some changes. Here is a new version, sharper, and I think the color is a little better.


The link is still

Dragon Star
2006-Dec-10, 02:40 AM
Oh yea, major difference. Really makes the stars and gas pop out at you.