2018 April 13 Sun - AR12704
AR12704 suddenly showed up near the E limb on April 12. There are several minor flares from this AR, and many filaments.
In white light, several small spotlets scattered around a small but mature sunspot.
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 April 13 Sun - AR12704
2018 April 13 Sun - AR12704
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- white-06_35_43Z.jpg (120.18 KiB) 已瀏覽 567 次
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- AR12704-08_16_25Z_cr.jpg (18.03 KiB) 已瀏覽 567 次
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最後由 PTS 於 週五 13 4月, 2018 21:43 編輯,總共編輯了 1 次。
Re: 2018 April 13 Sun - AR12704
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