2018 May 25 Sun - AR12712
1 day after turning to the front, AR12712 has developed into a very active group with strong flare activities. The leading sunspots are small while the following sunspot is much larger with many flares. A huge arena of filament surrounds the AR, and a set of filament run northwards, with one actually goes off-disc, forming a prominence.
As the slow motion is still unavailable, I have to continue with push or pull the telescope to put the image in field. This task becomes very tedious when working on close-up imaging, and I have to use very short exposures (thus high gain) to avoid blur images.
Telescope: AP Starfire EDT 155 mm f/9.
stopped to 80 mm (f/17.5) for disc images, with 4X telecentric lens (f/36) for closeups
filter: Solar Spectrum SO1.5/0.3A with CERF prefilter
Camera: ASI1600MM, 4656X3520 pixels (3.8 micron), binned 2
North is up, east is to the left.
2018 May 25 Sun - AR12712
2018 May 25 Sun - AR12712
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Re: 2018 May 25 Sun - AR12712
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- AR12712-02_22_07a_cr.jpg (95.39 KiB) 已瀏覽 369 次
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- AR12712-02_22_29Z_cr.jpg (98.72 KiB) 已瀏覽 369 次
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- AR12712-02_29_49Z_cr.jpg (100.38 KiB) 已瀏覽 369 次
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- AR12712-02_30_05Z_cr.jpg (97.02 KiB) 已瀏覽 369 次
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- AR12712-02_30_10a_cr.jpg (102.07 KiB) 已瀏覽 369 次
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- AR12712-02_30_16Z_cr.jpg (92.93 KiB) 已瀏覽 369 次
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- AR12712-02_30_22a_cr.jpg (74.73 KiB) 已瀏覽 369 次
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