2018 June 20 Sun - AR12713
AR12713 has undergone major changes since i last observed on June 16.
It has shown more flare activities, mainly from the leading pack of sunspots.
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 June 20 Sun - AR12713
2018 June 20 Sun - AR12713
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- white-01_24_17Z.jpg (110.89 KiB) 已瀏覽 512 次
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- AR12713-03_01_16Z_cr.jpg (52.87 KiB) 已瀏覽 512 次
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- surface-01_45_52Z.jpg (139.25 KiB) 已瀏覽 512 次
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Re: 2018 June 20 Sun - AR12713
more images
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- AR12713-02_21_48Z_cr.jpg (128.33 KiB) 已瀏覽 511 次
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- AR12713-02_22_05Z_cr.jpg (140.1 KiB) 已瀏覽 511 次
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- AR12713-02_38_36Z_cr.jpg (161.96 KiB) 已瀏覽 511 次
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- AR12713-02_45_49Z_cr.jpg (108.45 KiB) 已瀏覽 511 次
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