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NGC 5005 colour



 
 
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  #1  
Old July 20th 08, 09:59 PM posted to alt.binaries.pictures.astro
Stefan Lilge
external usenet poster
 
Posts: 2,269
Default NGC 5005 colour

I thought I had no colour frames for NGC 5005, but recently found some that
I took about a month later than the luminance.
Colour was 6x5 minutes each with 2xbinning.
5 minutes are probably a bit too long with 2xbinning at f/5.7, the green
channel had a background count of over 32000.
I also took some Halpha frames but didn't include them in the final version
as there were no HII regions visible even with Halpha.

The picture can also be found at
http://ccd-astronomy.de/temp/5005colourgut.jpg

Stefan

"Stefan Lilge" schrieb im Newsbeitrag news:...
I acquired the data for NGC 5005 in Canes Venatici two month ago, planning
to add colour later as this galaxy is moderately bright. As it looks like
I
won't get any colour this year I'll post the b/w version now.

Taken from the middle of Berlin with a 10" Meade ARC at f/5.7 on a G11
mount, SXV-H9 camera, 39x5 minutes.

The picture can also be found at
http://ccd-astronomy.de/temp/5005-39x5gut.jpg

Stefan






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  #2  
Old July 21st 08, 12:51 AM posted to alt.binaries.pictures.astro
Rick Johnson[_2_]
external usenet poster
 
Posts: 3,085
Default NGC 5005 colour



Stefan Lilge wrote:
I thought I had no colour frames for NGC 5005, but recently found some that
I took about a month later than the luminance.
Colour was 6x5 minutes each with 2xbinning.
5 minutes are probably a bit too long with 2xbinning at f/5.7, the green
channel had a background count of over 32000.
I also took some Halpha frames but didn't include them in the final version
as there were no HII regions visible even with Halpha.

The picture can also be found at
http://ccd-astronomy.de/temp/5005colourgut.jpg

Stefan

"Stefan Lilge" schrieb im Newsbeitrag news:...

I acquired the data for NGC 5005 in Canes Venatici two month ago, planning
to add colour later as this galaxy is moderately bright. As it looks like
I
won't get any colour this year I'll post the b/w version now.

Taken from the middle of Berlin with a 10" Meade ARC at f/5.7 on a G11
mount, SXV-H9 camera, 39x5 minutes.

The picture can also be found at
http://ccd-astronomy.de/temp/5005-39x5gut.jpg

Stefan



Nice to find lost data. I found a whole directory of unprocessed
Sharpless objects I'd forgotten all about. Taken in moonlight so not
clean data but now I think I can process them. Gives me something to do
while the moon and lousy seeing (6" last night!) shut me down.

Rather lacking in color. Some reddish dust near the core but otherwise a
rather bland colored galaxy. Some spirals are mostly white. This
appears to be one of them. I get shook when my background hits 1000.
No way I could handle 32000! I like it when its 250 or less. My frames
for the gravitational arcs was only 86 on the Lum images about about 120
on the color frames.

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 July 21st 08, 01:05 AM posted to alt.binaries.pictures.astro
Richard Crisp[_1_]
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Posts: 985
Default NGC 5005 colour

I like that a lot Stefan


"Stefan Lilge" wrote in message
...
I thought I had no colour frames for NGC 5005, but recently found some that
I took about a month later than the luminance.
Colour was 6x5 minutes each with 2xbinning.
5 minutes are probably a bit too long with 2xbinning at f/5.7, the green
channel had a background count of over 32000.
I also took some Halpha frames but didn't include them in the final
version as there were no HII regions visible even with Halpha.

The picture can also be found at
http://ccd-astronomy.de/temp/5005colourgut.jpg

Stefan

"Stefan Lilge" schrieb im Newsbeitrag news:...
I acquired the data for NGC 5005 in Canes Venatici two month ago, planning
to add colour later as this galaxy is moderately bright. As it looks like
I
won't get any colour this year I'll post the b/w version now.

Taken from the middle of Berlin with a 10" Meade ARC at f/5.7 on a G11
mount, SXV-H9 camera, 39x5 minutes.

The picture can also be found at
http://ccd-astronomy.de/temp/5005-39x5gut.jpg

Stefan







 




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