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Sh2-155 Cave nebula

Astrophotography CCD DSO Observatory Refractor Imaging
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#1 syxbach

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Posted 19 August 2021 - 01:25 AM

Third project from our observatory. I never thought the progress was that fast. We finished it before the new moon. This time, I tried bin 2 mode in RGB subs. This boosted the signal-to-noise ratio significantly, resulting in a noiseless, clean and sharp RGB data. The disadvantage is the star size was larger than what I obtained in bin 1 L subs. Therefore, I need to go for a star shrink process before LRGB combination. For this image, I did not do any noise reduction and sharpening in the linear format. 

 

Imaging details

Mount: Astro-Physics 1100GTO
Telescope: Takahashi TOA-130NS
Camera: QHY16200A

Focuser: 3.5 inch Feather touch focuser with HSM35 motor
Guide camera: Lodestar X2
Filter: Chorma LRGB, Astrodon 5 nm Ha and O3
Exposure time:
L: 36*15 min, bin1
R: 25*7.5 min, bin2
G: 27*7.5 min, bin2
B: 27*7.5 min, bin2

Ha: 19*30 min, bin1

Post-processing: Pixinsight 1.8.6+Photoshop
C&C are welcomes

 

Yuexiao

 

High-resolution image link

https://www.flickr.c...eposted-public/

 

51389043909_d6c7ffd35d_h.jpg


Edited by syxbach, 19 August 2021 - 08:40 AM.

  • Gregory, noodle, psandelle and 20 others like this

#2 Avgvstvs

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Posted 19 August 2021 - 03:34 AM

Very nice, makes me miss my TOA130 mad.gif

Lovely colours


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#3 syxbach

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Posted 19 August 2021 - 08:43 AM

Thank you!

 

Compared to TOA130, looks like people prefer lighter scopes?grin.gif  

 

 

Very nice, makes me miss my TOA130 mad.gif

Lovely colours



#4 Ron (Lubbock)

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Posted 19 August 2021 - 11:19 AM

Beautiful rendition of this complicated object.  I spent 15 hours on it last year, and it is challenging to merge the H-alpha emission and the the reflection nebula accurately.  Your dark site has given wonderful colors, whereas I had to fight with a lot of green noise and gradients from my Bortle 4-5 backyard. 

 

Keep the images coming; these results are really inspiring as those of us in the northeast ride out another week of endless rain and high humidity. 



#5 syxbach

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Posted 19 August 2021 - 03:08 PM

Thank you Ron. I am still collecting that 100-h datagrin.gif

 

Actually I did not use my HA data when I processed L. I only added it into red channel. I still need to learn how to fix the blowout around the bright stars.

 

Yuexiao

 

Beautiful rendition of this complicated object.  I spent 15 hours on it last year, and it is challenging to merge the H-alpha emission and the the reflection nebula accurately.  Your dark site has given wonderful colors, whereas I had to fight with a lot of green noise and gradients from my Bortle 4-5 backyard. 

 

Keep the images coming; these results are really inspiring as those of us in the northeast ride out another week of endless rain and high humidity. 



#6 mark in ventura

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Posted 19 August 2021 - 05:17 PM

Wonderful image ! I hope to have some clear skies soon without a moon to try it myself although you have set the bar quite high with your result.



#7 syxbach

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Posted 19 August 2021 - 08:42 PM

Thank you. As long as you have enough exposure, you will find the post-processing is quite easygrin.gif

 

Yuexiao

 

Wonderful image ! I hope to have some clear skies soon without a moon to try it myself although you have set the bar quite high with your result.




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