Tiny AR2706 in Ca K with the TOA150 on May 6

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christian viladrich
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Tiny AR2706 in Ca K with the TOA150 on May 6

Post by christian viladrich »

The seeing was not very cooperative this morning. Finally, I managed to get a decent view of AR2706 with an ongoing small flare.
Some isolated very small bright points are visible here and there :

Image


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Re: Tiny AR2706 in Ca K with the TOA150 on May 6

Post by Valery »

Hello Christian,

Just a perfect image for such an aperture!

Christian, tell us how much better this ASI290 camera for CaK imaging vs your older Basler 1920-155 with the IMX174chip ?
Your latest CaK images are so free from a noise and in particular from the read out noice! Is this camera a cooled one or not?

Hope we will see more such your CaK pictures.


Valery


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Re: Tiny AR2706 in Ca K with the TOA150 on May 6

Post by krakatoa1883 »

Really impressive, Christian.


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Re: Tiny AR2706 in Ca K with the TOA150 on May 6

Post by Montana »

Wow!! superb picture and the camera looks good too :bow
Alexandra


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Re: Tiny AR2706 in Ca K with the TOA150 on May 6

Post by christian viladrich »

Thanks a lot !

Valery, regarding the ASI290 here are some comments :
- I first compared the IMX174 and the IMX290 for imaging Venus in UV. I had the feeling that the IMX290 had a better quantum efficiency in UV. It was difficult to be sure of that since the gain (e-/ADU) and the full well in e- are very different.
- So I made some tests in Ca K on the Sun. And again, I had the feeling that the quantum efficiency of the IMX290 was a bit higher in UV.

BTW, Christian Buil measured a 67% QE at 400 nm :
Image

According to the following source, the QE of the IMX174 at 400 nm seems to be arround 50% :
https://www.ptgrey.com/support/downloads/10414

So, this is consistent with a slightly higher QE of the IMX290 at 400 nm compared to the IMX174.

- Furthermore, the resulting image quality is quite good with 60 stacked images. So, I think I'll stick to the ASI290 for HR Ca K imaging.

Skyrunner, 30 fps is far from enough. I run at 170 frames/s. This makes a huge difference.
Regarding optics, I think a long focus 150 to 200 mm Newtonian could do the job (with an internal ERF in front of the secondary mirror).

I am finally thinking that a 200 mm telescope can make sense for HR Ca K imaging...


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Re: Tiny AR2706 in Ca K with the TOA150 on May 6

Post by marktownley »

Excellent shot Christian!


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Re: Tiny AR2706 in Ca K with the TOA150 on May 6

Post by ffellah »

Fabulous Cal K image, Christian.

Franco


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