2018 April 23 Sun - AR12707
AR12707 never produce visible sunspots, and is now reduced to plages and filaments. It is located SW of AR12706.
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 23 Sun - AR12707
2018 April 23 Sun - AR12707
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- surface-02_11_31Z.jpg (159.29 KiB) 已瀏覽 384 次
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- cropped to 700 x 700 pixels
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