The Sun - 18th May

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Cliff
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The Sun - 18th May

Post by Cliff »

Quite pleasant rather like yesterday. It was nice to confirm yesterday's new spot is a genuine Sunspot & also get both White Light & Hydrogen Alpha images today.
Best wishes from Cliff
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SkyBrowser
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Re: The Sun - 18th May

Post by SkyBrowser »

I had a look this afternoon, at 1554UT, and could see 12824. It looked like it was sitting just above the Sun's south pole! But when tilt and inversion are taken into account it's around latitude 19N!
SkyBrowser
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Re: The Sun - 18th May

Post by SkyBrowser »

12824 very big, dark and obvious today. Naked-eye maybe?
RMSteele
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Re: The Sun - 18th May

Post by RMSteele »

Yes today 22/5/21 at 1518 UT there is one prominent spot with a horseshoe shaped umbra, and I counted six tiny spots around it in a spell of clear seeing with a 60mm OG by projection.
Regards Bob
michael feist
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Re: The Sun - 18th May

Post by michael feist »

Saturday 22nd May, MMXXI. In the afternoon. Horrible grey, showery, weather continues and worse tomorrow. However thinking slightly ahead, was trying to sort out a monocular for a solar projector, just in case we do get to see something of the solar partial eclipse. Picked up a 20x50 reasonably cheaply and tried it out for just a few minutes in a bit of a cloud gap and noticed an obvious quite large sunspot! Then more clouds and hardly any blue until teatime. At least that awful damned wind as died down. regards maf
SkyBrowser
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Re: The Sun - 18th May

Post by SkyBrowser »

RMSteele wrote: Sat May 22, 2021 3:24 pm Yes today 22/5/21 at 1518 UT there is one prominent spot with a horseshoe shaped umbra, and I counted six tiny spots around it in a spell of clear seeing with a 60mm OG by projection.
You've got sharp eyes! What size disk are you projecting? Mine is about 2.5". I can go larger, but the image is then exceedingly fuzzy.
RMSteele
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Re: The Sun - 18th May

Post by RMSteele »

Hello Skybrowser, I project a 4 to 6 inch disc inside a hand-held, shaded box. I expect your new telescope will be a big leap forward in terms of image quality. Best wishes Bob
michael feist
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Re: The Sun - 18th May

Post by michael feist »

Re. 20x50 monocular to view eclipse. I had a bit of trouble there the following day when used in full sunlight. Although just as an opportunity to see the eclipse rather than observe the a Sun as such, the size of the did not really concern me too much. The main problem of course is the build of heat in any optics, and way back in the 1960s, when I stopped down that 8" reflector I inserted the stop up against the mirror rather than at the from of the tube. The silvering overheated, and actually blistered! At least it gave me the chance to go watch when it was being resilvered. Anyway, back to the present.
The monocular was rather overpowered for general use making it rathe difficult to line up the projected image of the Sun and finally noticed when closely examining it afterwards that the circularity of the edge of the fov, was now ragged and almost slotted as kept moving the Solar image across the edges, and it had melted. This reminded me of a second-hand Russian scope I once had that had a field-stop that looked like an edge-on Saturn with rings and had been obviously also used to project the Sun. So stopped it down to 25mm. The image is decidedly fainter of course and a smaller diameter projection size needed but hopefully will not continue to melt during the eclipse, especially as I will take short looks, covering the front completely between times. Regards maf.
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