M51: Whirlpool Galaxy (旋渦星系)

行星、深空天體、星野攝影等
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anguslau
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M51: Whirlpool Galaxy (旋渦星系)

文章 anguslau » 週日 10 7月, 2011 15:19

M51: Whirlpool Galaxy (旋渦星系)
Yin Na Shan, 4-Jul-2011
20x5m L, 1x5m each of RGB (Total 115m)
Astrodon filters
FSQ-106ED f/5, QSI-583, EM-200
Autoguide via OAG + Lodestar
CCDStack, PS CS5, cropped and resized
附加檔案
M51_Q583_110704_20x5m_L_crop2sharp.jpg
100% crop luminance version
M51_Q583_110704_20x5m_L_crop2sharp.jpg (199.09 KiB) 已瀏覽 5414 次
M51_Q583_110704_20x5m_Lcolor_2.jpg
100% crop with better color data borrowed from web - color noise gone, but luminance noise evident due to insufficent exposure
M51_Q583_110704_20x5m_Lcolor_2.jpg (81.72 KiB) 已瀏覽 5414 次
M51_Q583_110704_20x5m_LRGB_crop7.jpg
100% crop of the galaxy - noise prominent
M51_Q583_110704_20x5m_LRGB_crop7.jpg (236.18 KiB) 已瀏覽 5414 次
M51_Q583_110704_20x5m_LRGB_1.jpg
Wide field version showing the tiny galaxy
M51_Q583_110704_20x5m_LRGB_1.jpg (174.21 KiB) 已瀏覽 5414 次
最後由 anguslau 於 週日 10 7月, 2011 17:22 編輯,總共編輯了 2 次。

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Eddy So
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文章 Eddy So » 週日 10 7月, 2011 15:31

[Good Job] Very nice! [Good Job]

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vegabort
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文章 vegabort » 週日 10 7月, 2011 16:43

another master piece [Good Job] [Good Job] [Good Job]

anyone
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文章 anyone » 週日 10 7月, 2011 17:00

master piece [Good Job]

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noodle
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文章 noodle » 週日 10 7月, 2011 18:06

好靚 [Good Job] [Good Job] [Good Job]

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昇仔
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文章 昇仔 » 週日 10 7月, 2011 18:21

[Good Job][Good Job] [Good Job] [Good Job]

Just tried to remove some of the noise and enhance the dark lanes and small features using the LRGB version. Personal taste only.
附加檔案
m51_q583.jpg
m51_q583.jpg (397.11 KiB) 已瀏覽 5298 次

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Banny Woo
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文章 Banny Woo » 週日 10 7月, 2011 18:23

如果唔係post係度我仲以為係nasa既相,正!
[冷汗直流]

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Subaru
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文章 Subaru » 週日 10 7月, 2011 18:30

Another observatory class photo!

The SN2011dn is showing orange, which I had it taken a week ago having colour towards the red end of the spectrum. This confirms the SN is not white but with colour.

anguslau
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文章 anguslau » 週日 10 7月, 2011 18:39

昇仔 寫:Just tried to remove some of the noise and enhance the dark lanes and small features using the LRGB version. Personal taste only.
With some second thoughts, I have adjusted my original post by removing some red cast and lowering the brightness and contrast. It helps to hide some noise around the fainter regions.

I have already used a very heavy dose of sharpening trying to bring out the last bit of info from the image. You are even more aggressive than me! :P Heavy processing an image and showing it in 100% magnification is indeed a very tough game. :oops:

anguslau
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文章 anguslau » 週日 10 7月, 2011 18:42

Subaru 寫:The SN2011dn is showing orange, which I had it taken a week ago having colour towards the red end of the spectrum. This confirms the SN is not white but with colour.
It seems to be slightly towards the red/yellow spectrum in my image. But my color data is very noisy to be reliable for the small star.

benben88
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文章 benben88 » 週日 10 7月, 2011 18:47

[冷汗直流] [冷汗直流] [冷汗直流]

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PeterPeter
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文章 PeterPeter » 週日 10 7月, 2011 18:54

原來是可以靚到咁 [頭暈目眩] [水汪汪] [Good Job]

quantumkit
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文章 quantumkit » 週六 28 1月, 2012 05:04

(sorry for digging old post)

I borrowed the picture as an introduction slide in my talk (with image credit of coz'). I have to say the people (astronomers) are truly amazing by this image taken with such a small telescope.

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