Thanks Dave. The exposure combinations used for this object are the ones I use the most. I only adjust them when the object has an area that is bright enough to saturate the chip, then I use shorter exposures, or a combination of short and long to get detail in all areas of the frame. I also use much longer exposures for narrowband frames. Cheers, Tyler -----Original Message----- From: utah-astronomy-bounces@mailman.xmission.com [mailto:utah-astronomy-bounces@mailman.xmission.com] On Behalf Of Dave Gary Sent: Saturday, April 20, 2013 6:06 PM To: Utah Astronomy Subject: Re: [Utah-astronomy] New Image - NGC4631, the Whale and Pup Galaxies - Nocturne Observatory That is very cool. Thanks for posting the composition data. Now, I have an idea of how to compose some of my sessions. However, with my limited aperture the exposure times would be much longer for some deep-sky objects. Great work as always. Dave On Apr 20, 2013, at 2:01 PM, Tyler Allred <tyler@allred-astro.com> wrote:
Hello All,
I spent the nights of March 17th and 18th working on a single image of NGC4631, with my new 12.5" Zambuto homemade astrograph, dubbed the "Supernova Astrograph".
Here is a link to the image on my website.
http://www.allred-astro.com//viewer.php?id=119 <http://www.allred-astro.com/viewer.php?id=119&cat=1&sub=23> &cat=1&sub=23
If you click the image a couple of times you can get to the full version. It is worth taking a few minutes to peruse because there is lots of detail in the main galaxy and there are tons of small galaxies scattered throughout the image.
This composite LRGB image is composed of
. 24 luminance exposures, of 10 minutes each, unbinned
. 18 red exposures, of 5 minutes each, binned 2x2
. 18 green exposures, of 5 minutes each, binned 2x2
. 18 blue exposures, of 5 minutes each, binned 2x2
I might try to add some hydrogen alpha data to the image, but perhaps it would be a waste of time, since the plain RGB image picked up the magenta star-forming regions quite well.
I hope you enjoy the image.
Cheers,
Tyler
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