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2014 Nov 21 - AR12209 is west of the meridian

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發表於 2014-11-30 20:03:28 | 顯示全部樓層 |閱讀模式
As AR12192 now west of the meridian, it still produces many flares.
It has become smaller and difficult to see with the protected naked eye.
The "white light" images are actually taken with the H-alpha filters, but cooled to ambient temperature instead of the normal working temperature at 59C

Telescope: AP Starfire EDT 155 mm f/9.
stopped to 50 mm for disc images, with 4X telecentric lens (f/36) for closeups
filter: Solar Spectrum SO1.5/0.3A with CERF prefilter
Camera: Imperx 4M15
North is up, and east to the left.
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Archiver|手機版|小黑屋|香港天文學會

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