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NGC 6210, the turtle nebula with short exposures (62500x500ms) at 0,14 arcsecond

astrophotography dso CMOS
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#1 exaxe

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Posted 17 April 2019 - 02:01 PM

Hi,

 

NGC 6210 is a planetary nebula found in the constellation Hercules.
It is located between 4000 and 6500 AL of the earth.
It is difficult to exactly locate a planetary nebula.The problem is that it is impossible to tell the difference between an NP which is 4000 AL of another which is 8000AL but which is 2x more luminous !
The Turtle is a very bright NP (mg area: 9) but small, the heart is almost 18 ''. It takes tight sampling to differentiate the details between them.
It is perfect for short exposures
I used my 2x barlow with the draw, a ratio of 2.7x, for the 300mm F4 is perfect!
As usual, I added several nights. I started in April 2018 but the result I did not like .. I added a few nights these days.
I totaled 12500x500ms in 2018, and 50000x500ms this year.
For extensions, I used 3sx2200 poses.

In the group of short exposures I posted a description of the treatment I used to get this picture.
http://www.astrosurf...210-avec-siril/
In fact I used several nights of the same expo to bring out the max of details that my setup and the seeing allowed me to do.

I used SIRIL for stacking, revealing details and improving the background.
After that I used cs for layer mixing and cosmetic tweaking.
It's a 2x drizzle ...

 

46616056685_551d0d460d_b.jpg

 

a crop of the center with a picture of the @HST to just check that certain details are present on my image:

 

46807805124_67dc06643a_b.jpg

 

then a montage to account for the apparent dimension of this planetary nebula with other known planetary nebulae:

 

46807804434_77cd2b7370_b.jpg

 

employee materials

TN300mm F4,Atlas (eq6), barlow 2x with draw (2,7 x) and ASI224MC

Stephane


Edited by exaxe, 17 April 2019 - 03:38 PM.

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#2 clusterbuster

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Posted 17 April 2019 - 02:13 PM

SUPERB !!!

 

Mark


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#3 RunningMan

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Posted 17 April 2019 - 02:47 PM

Wow! Amazing job!
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#4 Dwight J

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Posted 17 April 2019 - 02:49 PM

Very nice.  Lots of effort put forth for a fine result on this rarely imaged nebula.  I observed it visually many times.  


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#5 Jeff2011

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Posted 17 April 2019 - 03:51 PM

Cool!  What camera did you use?  What bit depth?


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#6 jhayes_tucson

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Posted 17 April 2019 - 03:55 PM

This is very impressive work and you've done a wonderful job of presenting it!  Very well done.

 

John


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#7 havasman

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Posted 17 April 2019 - 04:06 PM

That's a fine image and interesting video. Thanks.


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#8 calypsob

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Posted 17 April 2019 - 06:40 PM

This is awesome. Im curious about how you use calibration frames in siril. Are the flats darks and bias .ser?
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#9 exaxe

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Posted 17 April 2019 - 11:23 PM

thank you Mark

thank you RunningMan

thank you Dwight.J

thank you Jeff, it is an asi224mc, a planet dedicated camera color but thanks to its noise of reading very low I can use short exhibition times with a tight sampling. I film in 8b, it is the accumulation of images that creates the depth of my photo.

thank you John

thank you Havasman

thank you Wes, with Siril, I use very often the calibration mode 1 star, I choose a star rather bright but not saturated.
The Darks are incorporated in the main SER with Pipp, no bias or Flat.



#10 44maurer

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Posted 17 April 2019 - 11:28 PM

Impressive!
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#11 javier_gl

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Posted 18 April 2019 - 06:21 AM

Awesome!

 

Cheers,


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#12 scopenitout

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Posted 18 April 2019 - 01:31 PM

Truly remarkable image! And what dedication to capture it. Well done, Sir.
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#13 jmiller1001

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Posted 18 April 2019 - 09:03 PM

Awesome montage!  Nice job!


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#14 lock042

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Posted 19 April 2019 - 06:35 AM

This is awesome. Im curious about how you use calibration frames in siril. Are the flats darks and bias .ser?

You take flats, darks or bias in SER file and you process the sequence as usual in order to obtain the masters.


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#15 exaxe

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Posted 19 April 2019 - 03:01 PM

thank you Brian

thank you Javier, I told you that your website is excellent! the NGC40 you have details on the gorgeous first expelled layer!

thank you Scopenitout

thank you Jmiller,

thanks for the precision Cyril! it is true that with Siril we can handle the SER with a lot of flexibility!



#16 R Botero

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Posted 20 April 2019 - 07:28 AM

You are the man Stephane! :bow:
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#17 exaxe

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Posted 20 April 2019 - 07:52 AM

thank you Roberto!



#18 GA-HAMAL

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Posted 28 April 2019 - 10:08 AM

As always, good work! :smile:


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#19 TxStars

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Posted 28 April 2019 - 11:13 AM

Hi,

 

NGC 6210 is a planetary nebula found in the constellation Hercules.
It is located between 4000 and 6500 AL of the earth.
It is difficult to exactly locate a planetary nebula.The problem is that it is impossible to tell the difference between an NP which is 4000 AL of another which is 8000AL but which is 2x more luminous !
The Turtle is a very bright NP (mg area: 9) but small, the heart is almost 18 ''. It takes tight sampling to differentiate the details between them.
It is perfect for short exposures
I used my 2x barlow with the draw, a ratio of 2.7x, for the 300mm F4 is perfect!
As usual, I added several nights. I started in April 2018 but the result I did not like .. I added a few nights these days.
I totaled 12500x500ms in 2018, and 50000x500ms this year.
For extensions, I used 3sx2200 poses.

In the group of short exposures I posted a description of the treatment I used to get this picture.
http://www.astrosurf...210-avec-siril/
In fact I used several nights of the same expo to bring out the max of details that my setup and the seeing allowed me to do.

I used SIRIL for stacking, revealing details and improving the background.
After that I used cs for layer mixing and cosmetic tweaking.
It's a 2x drizzle ...

 

46616056685_551d0d460d_b.jpg

 

a crop of the center with a picture of the @HST to just check that certain details are present on my image:

 

46807805124_67dc06643a_b.jpg

 

then a montage to account for the apparent dimension of this planetary nebula with other known planetary nebulae:

 

46807804434_77cd2b7370_b.jpg

 

employee materials

TN300mm F4,Atlas (eq6), barlow 2x with draw (2,7 x) and ASI224MC

Stephane

What is the bright area in the lower center of your image? I dont see it in the HST image?



#20 exaxe

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Posted 28 April 2019 - 11:03 PM

thank you Ga-Hamal

TxStars : "What is the bright area in the lower center of your image? I dont see it in the HST image?"

In fact, looking good we see this white dot on the image of the HST, but as my telescope is smaller this kind of details takes up more space.




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