2018 April 23 Sun - AR12706

[PTS]

2018 April 23 Sun - AR12706

AR12706 has now developed into a huge AR, with the sunspots spanning more than 10 longitude degrees, and its filaments occupying more than 15 degrees in longitude.
The leading sunspot is large with multiple umbrae, while the following sunspots are small. Most of the flares come from the following 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.

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