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

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

Post by Valery » Fri May 17, 2019 2:04 am

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.
Attachments
AR12741-2019-05-11-C8-214mm-ARIES-DERF-CaK-Basler1920-155.jpg
AR12741-2019-05-11-C8-214mm-ARIES-DERF-CaK-Basler1920-155.jpg (161.49 KiB) Viewed 487 times
_AR12741-2019-05-11-C11-295mm-ARIES-DERF-QUARK-Chr-0,65x-Basler1920-155.jpg
_AR12741-2019-05-11-C11-295mm-ARIES-DERF-QUARK-Chr-0,65x-Basler1920-155.jpg (699.41 KiB) Viewed 487 times
"Solar H alpha activity is the most dynamic and compelling thing you can see in a telescope, so spend accordingly." (c) Bob Yoesle.

Largest full size 185 - 356mm Dielectric Energy Rejection Filters (D-ERF) by ARIES Instruments.

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

Post by p_zetner » 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

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

Post by Valery » Fri May 17, 2019 3:46 am

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
"Solar H alpha activity is the most dynamic and compelling thing you can see in a telescope, so spend accordingly." (c) Bob Yoesle.

Largest full size 185 - 356mm Dielectric Energy Rejection Filters (D-ERF) by ARIES Instruments.

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

Post by jp-brahic » Fri May 17, 2019 5:36 am

very nice résolution in H-Alpha Valery

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

Post by Montana » Fri May 17, 2019 9:36 am

What a delight to view :hamster: :bow

Alexandra

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

Post by MAURITS » Fri May 17, 2019 1:06 pm

Great resolution and excellent images Valery.
Regards,
Maurits

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

Post by eroel » Fri May 17, 2019 1:46 pm

Valery:
Impressive shots.
Best regards,
Eric.

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

Post by marktownley » Sat May 18, 2019 10:21 am

Impressive as always Valery!
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