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ASTRO: NGC 7635 in colour



 
 
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  #1  
Old November 4th 07, 05:01 PM posted to alt.binaries.pictures.astro
Stefan Lilge
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Posts: 2,269
Default ASTRO: NGC 7635 in colour

I did a Halpha image of NGC 7635 last year and added some RGB this year. I
had to do a 50/50 mix of the red channel and Halpha, otherwise the image
would look washed out with a pink hydrogen nebula.

Taken from the middle of Berlin,
luminance with a C8 at f/7, G11 mount, SXV-H9 camera, 36x10 minutes through
an Astronomik 13nm Halpha filter,
RGB 6x5 minutes each with an 8" LX200 at f/4.4, SXV-H9 camera.

The image can also be found at
http://ccd-astronomy.de/temp/7635colourgut.jpg

Halpha:
http://www.slilge.de/Sharpless/7635-36x10gut.jpg

RGB:
http://ccd-astronomy.de/temp/7635RGBgut.jpg

Stefan

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  #2  
Old November 4th 07, 06:33 PM posted to alt.binaries.pictures.astro
Rick Johnson[_2_]
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Posts: 3,085
Default ASTRO: NGC 7635 in colour



Stefan Lilge wrote:
I did a Halpha image of NGC 7635 last year and added some RGB this year.
I had to do a 50/50 mix of the red channel and Halpha, otherwise the
image would look washed out with a pink hydrogen nebula.

Taken from the middle of Berlin,
luminance with a C8 at f/7, G11 mount, SXV-H9 camera, 36x10 minutes
through an Astronomik 13nm Halpha filter,
RGB 6x5 minutes each with an 8" LX200 at f/4.4, SXV-H9 camera.

The image can also be found at
http://ccd-astronomy.de/temp/7635colourgut.jpg

Halpha:
http://www.slilge.de/Sharpless/7635-36x10gut.jpg

RGB:
http://ccd-astronomy.de/temp/7635RGBgut.jpg

Stefan

------------------------------------------------------------------------


That came out well. A change from the comet. I tried it again through
thick haze last night, haven't tried processing it yet.

I find if I add a bit of the H-alpha to the blue as well, say about
15%-20%, it helps the color balance. I tried 10% each of blue and green
since the H-beta line is somewhat green as well but prefer thought just
adding it to blue was more "natural". I haven't tried other
combinations as yet. Just adding it to the red gives me too much red and
blue features don't come through or do so as red instead.

Rick

--
Correct domain name is arvig and it is net not com. Prefix is correct.
Third character is a zero rather than a capital "Oh".

  #3  
Old November 4th 07, 07:15 PM posted to alt.binaries.pictures.astro
DvandenH
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Posts: 143
Default ASTRO: NGC 7635 in colour

Great image Stefan! very nice details.
This one is on my list for a long time now and i hope to shoot it one of
these days..

reg
Dirk van den Herik

A journey of thousand lightyears
starts with the first step.


"Stefan Lilge" wrote in message
...
I did a Halpha image of NGC 7635 last year and added some RGB this year. I
had to do a 50/50 mix of the red channel and Halpha, otherwise the image
would look washed out with a pink hydrogen nebula.

Taken from the middle of Berlin,
luminance with a C8 at f/7, G11 mount, SXV-H9 camera, 36x10 minutes
through
an Astronomik 13nm Halpha filter,
RGB 6x5 minutes each with an 8" LX200 at f/4.4, SXV-H9 camera.

The image can also be found at
http://ccd-astronomy.de/temp/7635colourgut.jpg

Halpha:
http://www.slilge.de/Sharpless/7635-36x10gut.jpg

RGB:
http://ccd-astronomy.de/temp/7635RGBgut.jpg

Stefan


  #4  
Old November 4th 07, 11:49 PM posted to alt.binaries.pictures.astro
Doug W.
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Posts: 264
Default ASTRO: NGC 7635 in colour

Never tire of seeing this object... and I have never got any good data on it
myself... very nice image Stefan!

--
Regards, Doug W.
www.photonsfate.com
"Stefan Lilge" wrote in message
...
I did a Halpha image of NGC 7635 last year and added some RGB this year. I
had to do a 50/50 mix of the red channel and Halpha, otherwise the image
would look washed out with a pink hydrogen nebula.

Taken from the middle of Berlin,
luminance with a C8 at f/7, G11 mount, SXV-H9 camera, 36x10 minutes
through
an Astronomik 13nm Halpha filter,
RGB 6x5 minutes each with an 8" LX200 at f/4.4, SXV-H9 camera.

The image can also be found at
http://ccd-astronomy.de/temp/7635colourgut.jpg

Halpha:
http://www.slilge.de/Sharpless/7635-36x10gut.jpg

RGB:
http://ccd-astronomy.de/temp/7635RGBgut.jpg

Stefan



  #5  
Old November 5th 07, 04:52 PM posted to alt.binaries.pictures.astro
Richard Crisp[_1_]
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Posts: 985
Default ASTRO: NGC 7635 in colour

all right, another color image!

nice job on a classic target too.


"Stefan Lilge" wrote in message
...
I did a Halpha image of NGC 7635 last year and added some RGB this year. I
had to do a 50/50 mix of the red channel and Halpha, otherwise the image
would look washed out with a pink hydrogen nebula.

Taken from the middle of Berlin,
luminance with a C8 at f/7, G11 mount, SXV-H9 camera, 36x10 minutes
through
an Astronomik 13nm Halpha filter,
RGB 6x5 minutes each with an 8" LX200 at f/4.4, SXV-H9 camera.

The image can also be found at
http://ccd-astronomy.de/temp/7635colourgut.jpg

Halpha:
http://www.slilge.de/Sharpless/7635-36x10gut.jpg

RGB:
http://ccd-astronomy.de/temp/7635RGBgut.jpg

Stefan



  #6  
Old November 6th 07, 01:57 AM posted to alt.binaries.pictures.astro
George Normandin[_1_]
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Posts: 1,022
Default ASTRO: NGC 7635 in colour


"Stefan Lilge" wrote

Stefan,

Beautiful image! I loved the h-alpha image also.

George N


 




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