Image of the day

Captured by
Douglas Rollain

Lion Nebula SH2-132 - RC71

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Posts Made By: Jim Thommes

June 4, 2006 05:51 PM Forum: CCD Imaging and Processing/Deep Sky

Another Centaurus A

Posted By Jim Thommes
Thanks everyone for your comments...

Vince, regarding the color balance, I had recently attended an RTMC presentation on "getting the color right". The presenter emphasized the use of a "G2V" star color calibration. I recently took exposures to calibrate my Edmund Optics RGB Dichroics and I appplied those factors to the color balance. As I mentioned, I had not taken into account atmoshperic extinction. So I worked up some factors for the site elevation (2000 meters in the Lagunas) and my angle from Zenith. I applied those factors to obtain this new image. So the attached image is color calibrated (G2V) and compensated for extinction. You can also get a full size image here (be sure to click th image on the page for full size):

http://jthommes.com/Astro/NGC5128.htm

I personally like the colors better than the original post. I imagine there will be a range of opinions.

June 10, 2006 06:10 PM Forum: CCD Imaging and Processing/Deep Sky

Keyhole Nebula

Posted By Jim Thommes
Greg,
Pretty cool. I get a real 3D effect on my monitor.

So the color seems a bit magenta to me (could be my monitor). I notice that you expose green at 1/2 the time. Do you have some calibration data on your filters that suggest that exposure ratio?

June 11, 2006 05:48 PM Forum: CCD Imaging and Processing/Deep Sky

Southern Pinwheel - M83

Posted By Jim Thommes
Thanks for the comments guys.

I'm throwing up another post related to this image on a separate thread. I thought I found a supernova...

June 12, 2006 05:38 AM Forum: CCD Imaging and Processing/Deep Sky

Thought I found a Supernova....

Posted By Jim Thommes
Guys, Thanks for the help and input.

Greg, Our timing lines up well - perhaps you imaged the same object. The object is identified as (1098) Hakone. It matches the right time, location, motion and direction of the object in the animation.

Although, I like Jess's explanation better grin

June 13, 2006 05:18 AM Forum: CCD Imaging and Processing/Deep Sky

First Light Butterfly

Posted By Jim Thommes
Nice Job Dan!
The notes on your link say you were working through some "birthing" pains on some new equipment. Was taht before or after the image? I can't see much evidence of a problem in the image.

Again, nice job.

June 17, 2006 10:12 PM Forum: CCD Imaging and Processing/Deep Sky

Crescent from Utah

Posted By Jim Thommes
Tyler,
Oooh, an all nighter - well I'm too old for that kinda stuff. I like the image. I think there was another comment on this too, but I like the background nebulosity.


June 17, 2006 10:16 PM Forum: CCD Imaging and Processing/Deep Sky

M53 - Waiting for Darkness

Posted By Jim Thommes
Tyler,
Yeah, these Globs are fun to do. Good capture and good use of the extra time.

June 17, 2006 10:21 PM Forum: CCD Imaging and Processing/Deep Sky

M27

Posted By Jim Thommes
Brian,
Cool image...

C11 at f/1.8. must be a Fastar system or something similar??

How do you like your SAC10?

June 20, 2006 03:56 AM Forum: CCD Imaging and Processing/Deep Sky

Crescent w/AP 130 F/6, SXV H9 in HA

Posted By Jim Thommes
Rob, Really nice image. I should post some of my first images here - they are pretty laughable, but you gotta start somewhere. Looks like you are well up the curve with your early efforts.

It is amazing what can be done with narrow band in light pollution. Some of our colleagues in more northerly locations than yours never get a true dark sky in the summer. They can use HA in deep twilight and still get a reasonable result.

June 20, 2006 03:58 AM Forum: CCD Imaging and Processing/Deep Sky

Orion Starshoot first light....

Posted By Jim Thommes
Congrats on the image Paul. Looking forward to more of your postings...

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