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ASTRO: NGC 4395 - ngc 4395-lrgb-0327-22.jpg (1/1)
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ASTRO: NGC 4395 - ngc 4395-lrgb-0327-22.jpg (1/1)
"Glen Youman" wrote in message ... I like that one Glen very nice closeup |
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ASTRO: NGC 4395 - ngc 4395-lrgb-0327-22.jpg (1/1)
On 4/19/2010 12:25 AM, Glen Youman wrote:
I'm puzzled by the detached piece to the lower left. I didn't pick it up in my image from 2007. http://www.spacebanter.com/attachmen...ntid=971&stc=1 For some reason I see I only used 3 ten minute Lum subs so not as deep as I'd like. Still I think it should show but doesn't. I stretched the blue POSS II plate and can't find it there either. I wonder if it is a processing artifact or a ghost image. The rest looks great. 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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ASTRO: NGC 4395 - ngc 4395-lrgb-0327-22.jpg (1/1)
Thanks Richard - I've thought it had a dynamic quality - sort of cart
wheeling through space. On Mon, 19 Apr 2010 08:12:40 -0700, "Richard Crisp" wrote: "Glen Youman" wrote in message .. . I like that one Glen very nice closeup |
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ASTRO: NGC 4395 - ngc 4395-lrgb-0327-22.jpg (1/1)
My guess is ngc 4399 - Simbad plots it in that area assuming my mental
shifting/flipping of the image/simbad plot is correct. On Mon, 19 Apr 2010 14:13:02 -0500, Rick Johnson wrote: On 4/19/2010 12:25 AM, Glen Youman wrote: I'm puzzled by the detached piece to the lower left. I didn't pick it up in my image from 2007. http://www.spacebanter.com/attachmen...ntid=971&stc=1 For some reason I see I only used 3 ten minute Lum subs so not as deep as I'd like. Still I think it should show but doesn't. I stretched the blue POSS II plate and can't find it there either. I wonder if it is a processing artifact or a ghost image. The rest looks great. Rick |
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ASTRO: NGC 4395 - ngc 4395-lrgb-0327-22.jpg (1/1)
Now you've got me concerned - I don't believe it is an artifact but I
can't nail it down - the Poss plates aren't that deep - I'll keep looking. On Mon, 19 Apr 2010 14:13:02 -0500, Rick Johnson wrote: On 4/19/2010 12:25 AM, Glen Youman wrote: I'm puzzled by the detached piece to the lower left. I didn't pick it up in my image from 2007. http://www.spacebanter.com/attachmen...ntid=971&stc=1 For some reason I see I only used 3 ten minute Lum subs so not as deep as I'd like. Still I think it should show but doesn't. I stretched the blue POSS II plate and can't find it there either. I wonder if it is a processing artifact or a ghost image. The rest looks great. Rick |
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ASTRO: NGC 4395 - ngc 4395-lrgb-0327-22.jpg (1/1)
On 4/20/2010 11:08 AM, Glen Youman wrote:
Now you've got me concerned - I don't believe it is an artifact but I can't nail it down - the Poss plates aren't that deep - I'll keep looking. On Mon, 19 Apr 2010 14:13:02 -0500, Rick wrote: On 4/19/2010 12:25 AM, Glen Youman wrote: I'm puzzled by the detached piece to the lower left. I didn't pick it up in my image from 2007. http://www.spacebanter.com/attachmen...ntid=971&stc=1 For some reason I see I only used 3 ten minute Lum subs so not as deep as I'd like. Still I think it should show but doesn't. I stretched the blue POSS II plate and can't find it there either. I wonder if it is a processing artifact or a ghost image. The rest looks great. Rick I tried a super nasty hard stretch of the SDSS image (attached). It is severely clipped in blue but not red or green. I see no hint of anything in that location. NGC 4399 is the star cloud almost directly opposite the detached piece in question, not far from a slightly orange star in your image. It is well within the halo of the galaxy. I've had internal reflections make such an object. I was sure it was real but before I finished processing the image I retook it and there it was. So now I was sure it was real. But then I realized I was using the same centering as before within a pixel or so. So I moved everything one minute of arc and tried again. It was gone! No sign of it. I never did find a suspect for it. No bright star nearby at all. Since then I've had it happen twice more. Those times I trusted Sloan and the DSS plates stretched hard and just cloned them out. Later when they were back in the sky again a test frame showed I was right doing so. Whew! 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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ASTRO: NGC 4395 - ngc 4395-lrgb-0327-22.jpg (1/1)
Amazingly deep image of this excessively faint galaxy.
I would prefer a bit less smoothing of the background, but that might just be me. Stefan "Glen Youman" schrieb im Newsbeitrag ... |
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