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Posts Made By: Jim Thommes

April 2, 2006 10:27 PM Forum: CCD Imaging and Processing/Deep Sky

Clusters NGC2362 and NGC2420

Posted By Jim Thommes
Here are a couple of open clusters from awhile back. The images and exposure / processing details can be accessed at:

NGC2362:
http://jthommes.com/Astro/NGC2362.htm

NGC2420:
http://jthommes.com/Astro/NGC2420.htm

I have also attached a mid sized image of NGC2420. The scope was a C8 and the camera was an Artemis285.

Both were fairly short exposures hampered by thin clouds. Don't know when I'm going to see clear skies again.


April 10, 2006 01:28 AM Forum: CCD Imaging and Processing/Deep Sky

The Lesser Leo Trio

Posted By Jim Thommes
Actually M105 and nearby NGC3384 and optically aligned NGC3389. The elipticals are not much to look at, but a grouping is interesting.

Full size image and exposure / processing details are at:

http://jthommes.com/Astro/M105.htm


April 16, 2006 11:48 PM Forum: CCD Imaging and Processing/Deep Sky

Open Cluster NGC 2546

Posted By Jim Thommes
Imaging has gotten very sparse with me lately. Seems like weather and work demands have conspired to limit my time under the stars. Last chance I had to get out, I aimed at a Southerly target - NGC 2546. I have attached a medium size image - the full size image is more interesting. It can be accessed by clicking on the image at:

http://jthommes.com/Astro/NGC2546.htm

Overall, a short exposure - L:R:G:B 10:6:6:6.

April 23, 2006 11:27 PM Forum: CCD Imaging and Processing/Deep Sky

M90 and IC3583

Posted By Jim Thommes
Here is M90 and IC3583 under heavy light pollution, but I got some detail from the effort. A full size image and exposure /processing details are at:

http://jthommes.com/Astro/M90.htm

Scope: C8 at f/8, Camera: Artemis285
L:R:G:B 60:14:14:14


May 1, 2006 12:01 AM Forum: CCD Imaging and Processing/Deep Sky

M85 and NGC 4394

Posted By Jim Thommes
Here is M85. As a lenticular galaxy, it's features are not particularly interesting. But it was a Messier object I had not yet collected. A full size image and exposure / processing details are at:

http://jthommes.com/Astro/M85.htm


May 21, 2006 06:58 PM Forum: CCD Imaging and Processing/Deep Sky

M81 and M82

Posted By Jim Thommes
I took some short exposures of M81 and M82 in a pretty wide field and as expected got limited detail on the objects.

I read that Rob Gendler had merged higher resolution data into wide field images so I did that here with some earlier close up data.

Full size image and details are here (click on the picture for full size):

http://jthommes.com/Astro/M81-82Wide.htm

(In case your wondering about the star shapes, I was checking out a focal reducer - I don't think it did well.)

May 29, 2006 06:51 PM Forum: CCD Imaging and Processing/Deep Sky

M109

Posted By Jim Thommes
Here is an image of M109. I was a bit challenged with this one in that it is somewhat small and dim. I need a better scope than my C8; I need better guiding and mount stability than my ASGT; And I need more exposure. Oh well, maybe someday.....

I have attached a midsized image, a full size image and exposure / processing details are here:

http://jthommes.com/Astro/M109.htm


June 3, 2006 02:21 PM Forum: CCD Imaging and Processing/Deep Sky

Another Centaurus A

Posted By Jim Thommes
Greg had recently posted an image of this object and I had just completed the processing on my offering. I have attached a mid size image. Full size and exposure processing details are at:

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

Greg commented on how much larger this object is compared to many images you see of it. I got a similar result, but due to those other images, I treated the size in my image as a gradient and removed part of it sad . Another observation is that I probably imaged closer to the horizion (it maxes out at 12 degrees altitude from my geography). I did not factor for atmospheric extinction so it is a bit "redder" than Greg's.

June 10, 2006 06:31 PM Forum: CCD Imaging and Processing/Deep Sky

Southern Pinwheel - M83

Posted By Jim Thommes
Here is a recent image I got. I have posted a mid size image but a full size image and processing details can be accessed at:

http://jthommes.com/Astro/M83.htm
(be sure to click on the image for full size)

This was taken with a C8 at f/8. L:R:G:B 50:16:16:16.

I applied my G2V calibration as well as Atmospheric Extinction factors for color calibration.

June 11, 2006 05:49 PM Forum: CCD Imaging and Processing/Deep Sky

Thought I found a Supernova....

Posted By Jim Thommes
Well, it isn't since it moves....

I recently posted an image of M83. When I was exposing the Luminance data, I noticed a "star" that didn't belong. Well, it moved from frame to frame so it is not a supernova discovery. You can see an animation of the object here:

http://jthommes.com/MiscAstro/Archives/M83object.htm
(caution, 1 Mbyte) - also time and location details

The M83 image for reference is here - note, the object just left a streak in the image so it was edited out:

http://jthommes.com/Astro/M83.htm
(posted earlier)

So the question remains for me - What is this object? You will note that it moves about 20 arc seconds in a period of just one hour. This seems to fast for a minor planet or asteroid which will move that distance in about 10 hrs. And it is too slow for an earth satellite. Any Ideas?


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