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ASTRO: NGC 3310 The Bowstring Galaxy



 
 
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  #1  
Old February 26th 07, 05:52 PM posted to alt.binaries.pictures.astro
Rick Johnson[_2_]
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Posts: 3,085
Default ASTRO: NGC 3310 The Bowstring Galaxy

A few weeks ago Stefan posted a preliminary shot of this one. At the
time I didn't recognize it. I've always called the the Bowstring and
never really used the NGC number. I had it on my to do list but until I
looked up the NGC number to tell the mount where to look I hadn't
realized it was the one Stefan had started. He got clouded out before
he got much data. While I've been bitching about the clouds I seem to
have fewer than anyone else. We haven't heard from Doug in ages. The
clouds cooperated but this was at the height of my frost problem. I had
to severely darken the background to hide a lot of funny colorful
gradients where different frost patterns, some on the filters, some on
the front of the optical window painted the image. Thus, I lost the
faint outer arc though the inner one shows nicely. Now that I will soon
have that under control (when the heaters arrive) I'll retake it without
those several dozen gradients. HD 92095 at magnitude 6.8 is the orange
star at the top and it cast some awful reflections in addition to the
frost glares. I used all RGB images as well as the luminosity frames to
make the luminosity frame. This tended to more equalize the various
gradient problems making them a bit easier to remove or hide and still
get some of the fainter parts of the galaxy. So what happened to the
galaxy this guy collided with. Searching around the area on the DSS
plates I couldn't find a likely candidate. Something sure hit this guy
in the past. I see it is now considered a star burst galaxy. It sure
has a ton of blue knots. Hubble's view is at:
http://antwrp.gsfc.nasa.gov/apod/ap010911.html The enlarged image is
upside down compared to mine, the smaller version rotated clockwise 90
degrees. The orange star is the best locator.

14" LX200R@f/10, L=19x5' RGB=3x5' all binned 2x2, STL-11000XM, Paramount ME

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".

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  #2  
Old February 26th 07, 07:37 PM posted to alt.binaries.pictures.astro
Stefan Lilge
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Posts: 2,269
Default ASTRO: NGC 3310 The Bowstring Galaxy

Great detail Rick. Quite a shame with the gradients, the outer parts of this
galaxy are so faint that even under darks skies it probably is only a few
counts above background. Of course you still got considerably deeper than
myself.
If weather continues like this I'll have to wait till next year to get more
frames of this object. Last time I set my scope up it was to test some
changes on my G11 mount (new worm and new motors), but I didn't even get
full 4 minutes to measure the periodic error over a full worm period before
the clouds came. At a bit more than 2 minutes this must be one of the
shortest nights of imaging I ever had. And nothing but rain and storms
forecast for the next days. Last year I had 12 nights of imaging in January
and February, this year I had two and both were cut short by clouds.

Stefan

"Rick Johnson" schrieb im Newsbeitrag
...
A few weeks ago Stefan posted a preliminary shot of this one. At the
time I didn't recognize it. I've always called the the Bowstring and
never really used the NGC number. I had it on my to do list but until I
looked up the NGC number to tell the mount where to look I hadn't
realized it was the one Stefan had started. He got clouded out before
he got much data. While I've been bitching about the clouds I seem to
have fewer than anyone else. We haven't heard from Doug in ages. The
clouds cooperated but this was at the height of my frost problem. I had
to severely darken the background to hide a lot of funny colorful
gradients where different frost patterns, some on the filters, some on
the front of the optical window painted the image. Thus, I lost the
faint outer arc though the inner one shows nicely. Now that I will soon
have that under control (when the heaters arrive) I'll retake it without
those several dozen gradients. HD 92095 at magnitude 6.8 is the orange
star at the top and it cast some awful reflections in addition to the
frost glares. I used all RGB images as well as the luminosity frames to
make the luminosity frame. This tended to more equalize the various
gradient problems making them a bit easier to remove or hide and still
get some of the fainter parts of the galaxy. So what happened to the
galaxy this guy collided with. Searching around the area on the DSS
plates I couldn't find a likely candidate. Something sure hit this guy
in the past. I see it is now considered a star burst galaxy. It sure
has a ton of blue knots. Hubble's view is at:
http://antwrp.gsfc.nasa.gov/apod/ap010911.html The enlarged image is
upside down compared to mine, the smaller version rotated clockwise 90
degrees. The orange star is the best locator.

14" LX200R@f/10, L=19x5' RGB=3x5' all binned 2x2, STL-11000XM, Paramount
ME

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".


 




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