Close up of the huge sunspot AR11476 in Calcium-K

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smerral
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Close up of the huge sunspot AR11476 in Calcium-K

Post by smerral »

Image
BRIAN
Celestron Nexstar 8SE, Ioptron CEM 25P mount
Altair Astro 102 ED refractor with Lunt B600 CaK diagonal
Coronado PST DS, Daystar Quark
ZWO ASI120MM camera, Canon 1000D (astro modified), Starlight Express SXV H9-C.
Gallery: http://www.astrobin.com/users/smerral/
David Frydman
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Re: Close up of the huge sunspot AR11476 in Calcium-K

Post by David Frydman »

Dear Brian,
Thank you for showing the fine photo of the sunspot.

Only cloud for me all day, also rain.
Regards, David
astroeyes
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Re: Close up of the huge sunspot AR11476 in Calcium-K

Post by astroeyes »

That's a real cracker, Brian. You can almost feel that you're peering down into the sunspot. Brilliant shot.
David.
Orion Optics DX250
Starlight Xpress SXV H9C ccd camera
Skysensor 2000 for tracking and GOTO
brian livesey
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Re: Close up of the huge sunspot AR11476 in Calcium-K

Post by brian livesey »

Great stuff Brian. You really have progressed with your imaging in recent years. :wink:
brian
smerral
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Re: Close up of the huge sunspot AR11476 in Calcium-K

Post by smerral »

Thanks everyone! :)
BRIAN
Celestron Nexstar 8SE, Ioptron CEM 25P mount
Altair Astro 102 ED refractor with Lunt B600 CaK diagonal
Coronado PST DS, Daystar Quark
ZWO ASI120MM camera, Canon 1000D (astro modified), Starlight Express SXV H9-C.
Gallery: http://www.astrobin.com/users/smerral/
smerral
Posts: 1363
Joined: Sun Oct 25, 2009 3:56 pm
Location: Caithness
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Re: Close up of the huge sunspot AR11476 in Calcium-K

Post by smerral »

Here's another shot from today, the 11th of May. There are some faint vertical lines on my images that I am trying to get to the bottom of. It may be that the ST102 optics isn't up to scratch so next time I will be using the ED80. This spot was certainly worth a capture today though. :)

Image

And an inverted view:

Image
BRIAN
Celestron Nexstar 8SE, Ioptron CEM 25P mount
Altair Astro 102 ED refractor with Lunt B600 CaK diagonal
Coronado PST DS, Daystar Quark
ZWO ASI120MM camera, Canon 1000D (astro modified), Starlight Express SXV H9-C.
Gallery: http://www.astrobin.com/users/smerral/
David Frydman
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Re: Close up of the huge sunspot AR11476 in Calcium-K

Post by David Frydman »

Dear Brian,
Lovely photo.
I saw Sunspot group in PST and white light this morning although cloud gaps were not large. Then 7 1/2 8ths cloud much of the day, but now large gaps.
Impressive large cumulus all day, giving good cloud photos.

I don't know much about digital imaging, but would wonder if the lines are directly due to optics of 102 mm scope.
Possibly a type of Moire effect due to pixel size, but I don't know why it should result in faint vertical lines.
Perhaps the array or the way the shutter behaves.
I would be interested in the explanation.

regards, David
Paul Millington
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Re: Close up of the huge sunspot AR11476 in Calcium-K

Post by Paul Millington »

Hi Brian,
You have got a set of very good pictures :)

All the best
Paul
Astronomy is looking up
Lat : 51.62N Lon : 0.75W
smerral
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Re: Close up of the huge sunspot AR11476 in Calcium-K

Post by smerral »

Thanks Paul. :)
David, I've posted this on other forums and the consensus seems to be that it is probably the camera causing the lines, but why this should happen with the Cak is a bit of a mystery - I don't get them with Ha. I need to experiment a bit more with camera settings etc......
BRIAN
Celestron Nexstar 8SE, Ioptron CEM 25P mount
Altair Astro 102 ED refractor with Lunt B600 CaK diagonal
Coronado PST DS, Daystar Quark
ZWO ASI120MM camera, Canon 1000D (astro modified), Starlight Express SXV H9-C.
Gallery: http://www.astrobin.com/users/smerral/
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