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101hrs of Ha Helix with a 4"

astrophotography ccd dso refractor
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#1 Suavi

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Posted 09 September 2019 - 02:31 AM

Hi all,

 

Sharing my attempt at revealing some of the fainter structures within the familiar Helix.

 

Acquisition details:

 

Integration: 194 x 15-minute subs at f/4.5 taken last year and 157 x 20-minutes subs at f/6 acquired this month.

Scope: CFF 105

Mount: Mach1

Camera: QSI 690

 

Astrobin link: https://www.astrobin.../full/1qk9l2/0/

 

And high res: https://cdn.astrobin...36_wmhqkGbg.jpg

 

The faintest bits that are still visually distinguishable are just 1 ADU above the floor. Since my camera's gain is 0.16e and the subs were 15-minutes and 20-minutes long, then, unless my maths is wrong, these faint areas register 1 photon every 1.5 - 2 hours of exposure with my scope-camera combo. Need a bigger scope.

Attached Thumbnails

  • Helix_small.jpg

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#2 44maurer

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Posted 09 September 2019 - 09:32 AM

Wow that’s incredible. Do you plan to finish the Other NB or RGB?



#3 Stelios

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Posted 09 September 2019 - 12:34 PM

This is the type of image that makes one want to go and delete all his own images of the Helix... Just incredible. 

 

I think you did more than fine with the scope you have... 


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#4 2ghouls

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Posted 09 September 2019 - 12:43 PM

Great work! Some very nice details I haven't seen before. I commend you on your dedication!



#5 Narrowbandpaul

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Posted 09 September 2019 - 12:56 PM

What a fantastic image. It doesn’t need any colour to be any more fantastic. Just 1 add above the background. Well Done.

#6 Narrowbandpaul

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Posted 09 September 2019 - 12:57 PM

Autocorrect fail....ADU

#7 Morefield

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Posted 09 September 2019 - 01:52 PM

 

 

The faintest bits that are still visually distinguishable are just 1 ADU above the floor. Since my camera's gain is 0.16e and the subs were 15-minutes and 20-minutes long, then, unless my maths is wrong, these faint areas register 1 photon every 1.5 - 2 hours of exposure with my scope-camera combo. Need a bigger scope.

 

This is really lovely!  Great dedication.  I tried to get this same extended nebula with my 14" Planewave and 9 micron pixels but didn't capture it nearly as well.  I think you should change your statement to Need a FASTER scope.  Mine was F7.  F4 and you are in business. 

 

Actually, I think two other things are even more important: Sky brightness and elevation.  I had to shoot this very low in the sky at 33 north latitude.  So I was ending up with gradients that needed removal.  Gradient removal can be less precise than the small ADU counts at times.  My location is a bortle 3 but of course sky brightness is much worse low in the sky.   



#8 H-Alfa

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Posted 09 September 2019 - 02:33 PM

Wow, you went really deep!
If you go for another 100h on OII you will see the big bang!
Congratulations.

Enviado desde mi ANE-LX1 mediante Tapatalk

#9 Suavi

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Posted 09 September 2019 - 04:23 PM

Wow that’s incredible. Do you plan to finish the Other NB or RGB?

Thank you Brian. Aiming to put together 100% pure narrowband. Just need more data.

 

This is the type of image that makes one want to go and delete all his own images of the Helix... Just incredible. 

 

I think you did more than fine with the scope you have... 

Thank you for your kind feedback Stelios.

 

Great work! Some very nice details I haven't seen before. I commend you on your dedication!

Thank you Nico. Took about 25 nights to collect all that data.

 

What a fantastic image. It doesn’t need any colour to be any more fantastic. Just 1 add above the background. Well Done.

Thank you Paul. After 50 hours there was not much visual difference, but I was curious so I kept going.

 

This is really lovely!  Great dedication.  I tried to get this same extended nebula with my 14" Planewave and 9 micron pixels but didn't capture it nearly as well.  I think you should change your statement to Need a FASTER scope.  Mine was F7.  F4 and you are in business. 

 

Actually, I think two other things are even more important: Sky brightness and elevation.  I had to shoot this very low in the sky at 33 north latitude.  So I was ending up with gradients that needed removal.  Gradient removal can be less precise than the small ADU counts at times.  My location is a bortle 3 but of course sky brightness is much worse low in the sky.   

Glad you like it. You are probably right; with the same 4" with a reducer at f/4.5 I was getting higher SNR with 15-minutes than 20-minutes at f/6 with just a flattener. Data was acquired from a small coastal town at 20 south latitude, so not perfect neither, but the Helix passes overhead and there are hardly any gradients in the data.

 

Wow, you went really deep!
If you go for another 100h on OII you will see the big bang!
Congratulations.

Enviado desde mi ANE-LX1 mediante Tapatalk

Another 100hrs? Oh no! LOL

 

Already have 30 hours of NII and 20 hours of OIII. Will try SII as well before putting a colour version together.


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#10 lynnelkriver

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Posted 09 September 2019 - 09:05 PM

Just amazing!  Man the dedication to capture all that imaging time!  Scott



#11 ChrisFC

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Posted 10 September 2019 - 03:00 AM

Stunning! I can see the individual photons working together

#12 ciraxis

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Posted 10 September 2019 - 06:54 AM

Truly impressive!



#13 Atik Cameras

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Posted 10 September 2019 - 07:03 AM

Very impressive and great dedication! Can't wait for the color version! :)

 

Vince



#14 lucam

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Posted 10 September 2019 - 09:37 AM

That is outstanding! The nebula extends way past what is commonly imaged. Integration time really paid off here!



#15 ChristopherBeere

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Posted 10 September 2019 - 11:44 AM

After 50 hours there was not much visual difference, but I was curious so I kept going.

waytogo.gif

 

Absolute stunner



#16 Suavi

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Posted 10 September 2019 - 06:49 PM

Thank you all for encouragement and such nice feedback.

 

Bad news is that my PC with all Helix data has died last night - hopefully the hard drive is okay, as I have not backed all of the data.

 

While the PC is being repaired, I started collecting SII last night. Not much signal in there, but will try to get a few nights worth of SII. The Helix is right next to the bright one in the sky over the next week, so may need to wait a bit and hopefully the skies will remain clear in the coming weeks, as well as my data will hopefully be recovered from the PC.



#17 44maurer

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Posted 10 September 2019 - 07:05 PM

Hope you get your data, was looking forward to the color version.



#18 Suavi

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Posted 15 September 2019 - 03:57 AM

Thank you Brian - hopefully on Monday or Tuesday at the latest I will get the good news that the data is safe. In the meantime, while the Helix was very close to the full moon, I got about 20 hours worth of SII.



#19 FiremanDan

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Posted 15 September 2019 - 09:06 AM

WOW! That is incredible! 



#20 kyle528

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Posted 15 September 2019 - 09:57 AM

Simply incredible. I'm not usually a fan on B&W but this is something else... 



#21 PowerM3

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Posted 15 September 2019 - 12:07 PM

Wow, very nice results. Hope your data is not lost as that would be a total shame. 



#22 Suavi

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Posted 16 September 2019 - 03:41 PM

WOW! That is incredible! 

Thank you Dan. You have some really beautiful images in your gallery waytogo.gif

Simply incredible. I'm not usually a fan on B&W but this is something else... 

Glad you like it Kyle. Some DSO present themselves quite nicely in B&W in narrowband.

Wow, very nice results. Hope your data is not lost as that would be a total shame. 

Thank you for such kind feedback. I was told yesterday that it was motherboard that failed, so chances are the hard drive is fine, fingers crossed.


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