Sunspot AR2891 10-28-2021 UTC 20:27 (Steve Lantz)

Contains: Solar system body or event

Sunspot AR2891 10-28-2021 UTC 20:27

Acquisition type: Lucky imaging

Since Jupiter is now fading into the west, I decided to go sunspotting. Sunspot AR2891 is an interesting target because it is just coming around on the sun's trailing limb and this gives the image a special perspective. The diagram from Spaceweather.com shows the position of this sunspot relative to the sun's disk at a time earlier in the day. The exposures were 8.3 ms at a rate of approximately 32 fps. The final image was produced by stacking 15 % best images out of a total of 2,278 frames. Daytime seeing is always difficult to work with, but now that the Northern Hemisphere is heading into winter, the sun is getting lower in the sky and we have to shoot through more atmosphere and this compromises the seeing even more. I used a solar continuum filter that yields a narrowband image in the green part of the spectrum; the reduction in light made it necessary to use a relatively high gain of 328. I rendered the final image in monochrome because who wants to see a green sun! LOL

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Sunspot AR2891 10-28-2021 UTC 20:27

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