AR2529 Collage

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AR2529 collage
Taken by Bill Hrudey on April 21, 2016 @ Cayman Islands

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The recent monster sunspot, AR2529, was captured over a 12 day period and assembled as a collage. The scope was my 8 inch Solar Newton using an ASI1741MM and 3x's Barlow. Processing with Autostakkert2 and ImPPG. Only one image is shown here as a sample but, I've provided a link to the complete image set which will have better resolution on SolarChat. http://solarchat.natca.net/viewtopic.php?f=4&t=19449

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Comments

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Great work, very interesting !
Cheers,
Bernard.

Posted by astrofrenchy 2016-04-21 10:25:35

Very good evolution imaging! It seems that you have some good seeing there, and luckily for long periods of time! Excellent work!

Posted by MaximilianT 2016-04-24 07:27:15

Hi Bill, I read on solar chat the problems that you were having regarding your solar Newtonian. Is it possible that light is reflecting off the rear of the mirror and scattered into your image? You mentioned that a piece of black paper on the back help somewhat. You can contact me at randallrshivak@yahoo.com Best of luck to you. Randy

Posted by mr40mm 2016-04-24 10:31:15

Hi Randy,

Many thanks for your post. Yes, there were several issues with initial trials but, in the end, were solved by using my ASI174MM USB3 with an ACTIVE extension cable. Prior to this, Id tried dozens of options none of which made any difference. The black paper on the rear surface of the mirror seemed to help a little but, was contrary to Christian Vilardrichs work (worth Googling) suggesting that less reflection occurred when the rear of mirror was uncovered. On the other hand, there was another individual that swears by a black coating.

Ultimately, it was the vastly higher fpss with USB3. The DMK41 I was using before was too slow at 15 fps compared to the ASI174MM USB3 at 75+ depending on matrix size. This resulted in much shorter exposure times and better captures.

Are you giving thought to a de-aluminized solar Newton ? There are not many around but, I think they are the best option - certainly more practical than the iStar 8 inch refractor that P, Tossi uses. Currently, Im working on a design for a 12-1/2 inch f/5 solar Newton on a welded steel fork mount. Given Dawes limit, this should have wonderful resolution of granules.

Cheers,

Bill

Posted by whrudey 2016-04-24 12:02:45

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