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Bubble Nebula and neighbors HA

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#1 andysea

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Posted 30 June 2013 - 07:55 PM

I know this is a very common object but I thought I would post anyway.
4 hour integration time.

Astrodon 3mn Ha.
TOA130 @f5.8 W/TOA130RD reducer.
QSI583wsg @-15
AP Mach1
Macbook air 11" (my favorite toy)
12 20minute subs, calibrated.
Average/poor seeing +/- 0.5 RMS.

Feedback and comments always encouraged!
http://www.flickr.co...277388/sizes/l/
L and RGB will most likely be acquired later to complete.

Thanks for looking!
Andy

#2 Erskin71

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Posted 30 June 2013 - 08:14 PM

Great start. Can't wait to see the final.

#3 JWalk

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Posted 30 June 2013 - 10:00 PM

Good work. I like the framing. Add some color to that bad boy!

#4 andysea

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Posted 01 July 2013 - 01:44 AM

Thanks guys. Yes I will definitely add color! I think some wavelet noise reduction with PI is also in order.

Andy

#5 jerryyyyy

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Posted 01 July 2013 - 08:45 AM

Yes, nice start. Would be interested in following how you process it in PI.

I have started doing a few nebula in RGB+Ha. There is a good script in PI for that. You can see then in my AstroBin gallery. They come with some of the recipes. I am on that steep learning curve with PI.

Was there a particular star you centered this on? What is the field width?

#6 Eddie R

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Posted 01 July 2013 - 08:45 AM

Awesome framing and Ha data, you got the nebulosity to connect the M52 :) One of my favorite objects.

#7 andysea

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Posted 01 July 2013 - 10:07 AM

Thanks again!

Jerry, I have a script to combine HA+RGB, it might be the same that is on Astrobin. I will check later. However this time I was planning to LRGB and then add the HA data to my red channel. I have never tried it but it should work well.
Do you have a link to the Astrobin link? I would be interested in looking at it.
Regarding centering. With SGP I just click anywhere on my test image and select "center here". SGP plate solves the image and centers the point that I clicked. So I didn't center on any particular star, I just eyeballed where I wanted the center of my image to be in order to get the framing that I wanted.

Eddie, Thanks! I really wanted to capture as much nebulosity as possible and I think that the 20 minute subs really helped:)

Andy

#8 rigel123

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Posted 01 July 2013 - 12:02 PM

Very nice Andy, great field.

#9 Cristina Cellini

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Posted 01 July 2013 - 02:27 PM

Wow, I like this image!
I am going to image this object during summer.

Cristina

#10 jerryyyyy

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Posted 01 July 2013 - 04:48 PM

This one uses the Astrobin script:

Posted Image

and this one adds H-alpha and O-III in a funny proportion suggested on this forum, using PixelMath.

Posted Image

The script I use in PI is call HaRGBCombinationHarry... it is not in the menus but you see it if under scripts you choose to "Execute a Script".

Sounds like a good idea to add to the RED channel. I have been struggling with an image for the Cat's Eye Nebula and when I add the H-alpha to whole things turns pink.... need a more subtle solution.

#11 andysea

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Posted 01 July 2013 - 05:09 PM

Thanks guys and thanks for the link!
I'll look it up.
I believe the script that I was using is a different one. I've used with pretty good success in the past. This image of the Jellyfish nebula was processed using HA as luminance.
http://www.flickr.co...sea/8381905223/
I think it's ok for the most part, however some of the stars have weird blue halos around them. I've seen this in many HA+RGB images. Another possible solution would be to use a synthetic luminance and then blend the HA in with the R channel, that I haven't tried yet.

#12 gramaglia

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Posted 01 July 2013 - 09:35 PM

Jerry have you tried using the peris method of adding HA to RGB image. it's shown in details on harry's pixinsight tutorials. He show's how to add it to a galaxy but the principles should apply to any RGB image. It just adds HA based on the bandpass width of your red filter.

#13 jerryyyyy

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Posted 02 July 2013 - 09:15 AM

Jerry have you tried using the peris method of adding HA to RGB image. it's shown in details on harry's pixinsight tutorials. He show's how to add it to a galaxy but the principles should apply to any RGB image. It just adds HA based on the bandpass width of your red filter.


I tried it yesterday and it did not seem to work, but I did not take into consideration the bandpass of the red filter. I used the script and substituted the Red for the RGB. Better read on this.

I found the tutorial:

http://www.harrysast...m/Hagalaxy.html

I tried to use his script not this, which uses PixelMath. I'll read on it...

#14 jerryyyyy

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Posted 02 July 2013 - 10:38 AM

I worked through the tutorial this AM and you are right you can control the amount of red cast... the technique is definately different from the script.

This Cat's Eye is processed this way. I'll post the original h-alpha below.

Attached Files



#15 jerryyyyy

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Posted 02 July 2013 - 10:44 AM

This is the H-alpha. 11 x 30minutes each. The signal is not enormous... I also need the O-III, but you would think you could get it to show up better in the red above....

Attached Files



#16 jerryyyyy

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Posted 02 July 2013 - 12:47 PM

One more image and I will keep quiet. I used this technique to add to the blue channel, which seemed to have more signal from the nebula.... but the gain I do not think is adjusted right... will have to play with this, and capture more data....

Attached Files



#17 andysea

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Posted 02 July 2013 - 01:30 PM

Wow great info you guys.
Jerry I am going to play with my RGB data once I get it and keep everyone posted on what I come up with:)

#18 jerryyyyy

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Posted 03 July 2013 - 10:26 AM

Wow great info you guys.
Jerry I am going to play with my RGB data once I get it and keep everyone posted on what I come up with:)


Yes, interesting to try to find the optimal method. Unfortunatelty we have had clouds hgere lately so I am stuck trying to stretch images rather than adding to the signal. This is my latest at stretching the H-alpha with a mask. There is some signal, but still hard for me to get the color out of it.

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#19 jerryyyyy

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Posted 03 July 2013 - 11:08 AM

I guess I can get the red out of the stretched image, but this obviously is not optimal, but if it works for these heavily stretched images, it will work well when there is more signal.

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#20 andysea

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Posted 10 July 2013 - 09:20 AM

Resurrecting this old thread.
I finally added L and RGB to my HA image. +/- 10 hours total. I Had to throw away about 1 hour of L because of cable management issues :(
I found a pixinsight script that does Ha+LRGB it very well - I think.
Here is the full frame shot
http://www.flickr.co...sea/9254428278/
and here is a crop of the bubble itself a little less saturated to bring out the fainter details.
http://www.flickr.co...sea/9251781511/






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