ESO 350-40 / PGC 2248 / Cartwheel Galaxy

[rogerg (Roger)]

G'day all,

This is a very hurried processing job, before I go to work.. but I'm so impressed with the results considering viewing conditions included winds up to 25km/hr, that I had to do it before going to work!

I will re-process in the coming week (and get around to that NGC 1672 colour data....).

http://www.rogergroom.com/rogergroom...m.jsp?Item=681

I'm surprised how much is visible in familiar galaxy. It's a very small guy. I'd love to get more detail including detail in the 2 nearby.

Main faults in the processing which I'll take more time over sometime soon, is the calibration of RGB, the alignment and scaling of RGB's to match each other and the L, and improving the noise reduction.

Enjoy!

Roger.

[iceman (Mike)]

That's a very interesting object, Roger! Lots of detail.

What's the size and magnitude of it?

Well done!

[PhotonCollector (Paul)]

Well done rogerg,

I've had this awesome ringed centaurian galaxy on my hit list for some time.
You have done very well to capture it. You can even see arm like
details extending from the nucleus to the outer ring. excellent.

top work

[rogerg (Roger)]

Originally Posted by iceman

What's the size and magnitude of it?

From memory, looking at TheSky last night, I think it was:
Mag: 16.4
Size: 0.6 x 0.5 (arc min)

I could be wrong- would have to check when I get home. Can't find the info after a quick google.

Looking at some other results on the web, I see just how much better I could get it under better viewing conditions I'll be trying some more exposures later I think, and going up to 1200sec subs, as I see there's some nice faint arms of one of the small guy's I could capture.

Roger.

[Ric]

What a fascinating galaxy Roger, very nice details and capture under what must have been difficult conditions.

It actually reminds me of a giant jelly fish gliding through space.

A fine effort

[Garyh]

Nice Roger!
You have done a fine job for a such a little target!
Colors look just right and image is not very noisey.
Look forwards to a deeper go.
cheers Gary

[theodog (Jeff)]

Nice image Roger.

I have used your sub times to take my own image. Probably due to filter densities my colours was different, but now I have a starting point.

First time I have done binned RGB. Works well.

I also have a problem with dark blotches on the ST7e images. Flatfields don't seem to help, I'll try some bias tonight. Do you have this problem? How do you overcome it?

Clear skies.

[rogerg (Roger)]

Originally Posted by theodog

First time I have done binned RGB. Works well.

Yeah, I'm quite new to it also. I don't always do RGB so I've taken a while to get around to trying binning them

Originally Posted by theodog

I also have a problem with dark blotches on the ST7e images. Flatfields don't seem to help, I'll try some bias tonight. Do you have this problem? How do you overcome it?

You might be interested in this thread.

I do get some random blotches over my images: dark, red, green, blue, luminance. Using reduction frames from the same night as the imaging run certainly helps. With all my "pretty picture" images (ones I don't care about the scientific aspects/accuracy of) I zoom in to about 300 pct in photoshop, and go over them with the clone tool, removing such artifacts.

With this paritcular object I had to do that quite a bit, because it was a rushed process of the images. Better processing of the images would have meant I'd end up with less specs, but I didn't have time.

I haven't had time to go and re-do them yet either. (and only have time to write this because I'm avoiding things at work , but can't do my processing at work!)



Roger.