H alpha from 19 April.

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p_zetner
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H alpha from 19 April.

Post by p_zetner »

Hi Everyone.

After a snow dump on Saturday night / Sunday morning, skies cleared to a beautiful morning on Monday with Astrospheric predicting better than average seeing. I set up the C8 and took a few higher resolution shots of three regions on the Sun shown in the NSO picture below, a larger faint prom and active regions 12816 and 12817. Sorry about the random orientations of the images! On Monday, AR12817 was apparently not a full-fledged active region with a (SDO) designation of S6825. Unfortunately, I missed the filaprom which a number of you imaged beautifully. The seeing was along the lines of the Astrospheric prediction; moments where it was above average. After packing up my gear, the clouds rolled in with more snow flurries and they are still falling as I post this!

Shots were taken with the Celestron C8, Aries ERF, ~4.6x telecentric, Daystar 0.6A QPE, ~0.65x focal reducer and Pt. Grey Grasshopper (IMX174 cmos). The effective focal length was about 6 metres.

Cheers.
Peter
20210419144530Ch_lbls_siz.png
20210419144530Ch_lbls_siz.png (208.64 KiB) Viewed 237 times
19Apr2021-085457_siz.png
19Apr2021-085457_siz.png (248.98 KiB) Viewed 237 times
19Apr2021_084737_v2_siz.png
19Apr2021_084737_v2_siz.png (418.67 KiB) Viewed 232 times
19Apr2021_084127_siz.png
19Apr2021_084127_siz.png (360.33 KiB) Viewed 237 times
Last edited by p_zetner on Tue Apr 20, 2021 7:40 pm, edited 1 time in total.


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Re: H alpha from 19 April.

Post by MAURITS »

Excellent images Peter.


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Maurits

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Re: H alpha from 19 April.

Post by p_zetner »

Thanks, Maurits!

I thought I would add some inverted images of the active regions.

Cheers.
Peter

19Apr2021_084737_inv_siz.png
19Apr2021_084737_inv_siz.png (470.04 KiB) Viewed 231 times
19Apr2021_084127_inv_siz.png
19Apr2021_084127_inv_siz.png (439.69 KiB) Viewed 231 times


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Re: H alpha from 19 April.

Post by ffellah »

Excellent images Peter ! Tremendous action in the second one, very well captured.

Franco :bow


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Re: H alpha from 19 April.

Post by p_zetner »

Thanks, Franco!

I also tried imaging at f46 (9.2 metres focal length) but the seeing really didn't support it. Here is the smaller AR in normal and inverted versions at this image scale. I wasn't going to post these but maybe they have some artistic charm!

Cheers.
Peter.
19Apr2021_091734_siz.png
19Apr2021_091734_siz.png (303.53 KiB) Viewed 215 times
19Apr2021_091734_inv_siz.png
19Apr2021_091734_inv_siz.png (379.41 KiB) Viewed 215 times


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Re: H alpha from 19 April.

Post by marktownley »

Nice set Peter!

How often do you have to collimate the scope? Do you have any issues with image shift with your SCT when focusing?


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Re: H alpha from 19 April.

Post by MapleRidge »

A great set of images Peter, well done :bow

Brian


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Re: H alpha from 19 April.

Post by MAURITS »

Very nice Peter.


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Maurits

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