2018 May 13 Sun - AR12709
In pseudo-white light, the small sunspot becomes smaller. Patches of plages show up in this AR, but flare activity is rare.
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 13 Sun - AR12709
2018 May 13 Sun - AR12709
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Re: 2018 May 13 Sun - AR12709
more images
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- AR12709-07_47_39Z_cr.jpg (72.49 KiB) 已瀏覽 214 次
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- AR12709-07_48_10Z_cr.jpg (67.15 KiB) 已瀏覽 214 次
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