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AR12741 at it's full opening in H-a and CaK high resolution with C11 and C8 scopes.

Posted: Fri May 17, 2019 2:04 am
by Valery
Hi all,

Early morning May 11 was a nice calm and warm with a light wind from the east. I knew, in a warm season this means - very probably the seeing will cooperate. And it does!
Here is the AR12741 in Ha in it's full glory, at full opening near the center of the sun disk.
Telescope used is C11 280mm F/10 SCT equipped with the ARIES 295mm full size dielectric energy rejection filter, H-a etalon - QUARK Chromosphere, 0,5x GSO reducer with shortened working distance and the ACA Basler 1920-155 camera. This imaging rig worked nicely for me.
4000 frames were recorded with Firecapture 2.62 and then 3000 of them were staked and processed with AS!2, AstarImage 3.0 Pro and PS CS6.

The seeing deteriorated in minutes and for imaging in UV in CaK line I were need to use a smaller aperture telescope - my old C8 203mm F/10 SCT. It was equipped with the ARIES 214mm DERF which transmits CaK too, a CaK filter and barlow lens. Camera was the same - Basler 1920-155.
Here is an image of the AR12741 in CaK. It seems that CaK worked somewhat off-band.


Right click on the images and choose to open them in a separate window - to them in a full resolution.

Thanks for looking and comments.


Valery.

Re: AR12741 at it's full opening in H-a and CaK high resolution with C11 and C8 scopes.

Posted: Fri May 17, 2019 2:21 am
by p_zetner
Astonishing imaging, Valery.

Look at the details in the light bridge! You give adaptive optics a run for its money.
I can’t believe you were able to stack 3000 / 4000 frames! Were these “real time” quality selected by SSM?

Cheers.
Peter

Re: AR12741 at it's full opening in H-a and CaK high resolution with C11 and C8 scopes.

Posted: Fri May 17, 2019 3:46 am
by Valery
p_zetner wrote:
Fri May 17, 2019 2:21 am
Astonishing imaging, Valery.

Look at the details in the light bridge! You give adaptive optics a run for its money.
I can’t believe you were able to stack 3000 / 4000 frames! Were these “real time” quality selected by SSM?

Cheers.
Peter
Thanks, Peter. Yes, there were 3000 frames out of 4000 stacked. But... wait... this is not my marginal case.
Last session I have stacked 4900 out of 5000.

Right now I am preparing for the today's morning imaging session. Prior to AR12741 depature.
Wish me the luck with 3900 out of 4000 frames! :)

Honestly, more frame stacking (even if they are not good enough) helps to have better S/N and deeper deconvolution.

Looking for your He D3 images!

BTW. Do you think that 0,3A Quantum PE will show the same dark clounds of the He absorbsion on the sun disk?


Valery

Re: AR12741 at it's full opening in H-a and CaK high resolution with C11 and C8 scopes.

Posted: Fri May 17, 2019 5:36 am
by jp-brahic
very nice résolution in H-Alpha Valery

JP

Re: AR12741 at it's full opening in H-a and CaK high resolution with C11 and C8 scopes.

Posted: Fri May 17, 2019 9:36 am
by Montana
What a delight to view :hamster: :bow

Alexandra

Re: AR12741 at it's full opening in H-a and CaK high resolution with C11 and C8 scopes.

Posted: Fri May 17, 2019 1:06 pm
by MAURITS
Great resolution and excellent images Valery.

Re: AR12741 at it's full opening in H-a and CaK high resolution with C11 and C8 scopes.

Posted: Fri May 17, 2019 1:46 pm
by eroel
Valery:
Impressive shots.
Best regards,
Eric.

Re: AR12741 at it's full opening in H-a and CaK high resolution with C11 and C8 scopes.

Posted: Sat May 18, 2019 10:21 am
by marktownley
Impressive as always Valery!