Scientists call sunspot groups by a letter and number designation. This sunspot group is labeled AR 2665. It has just REAPPEARED after making it all the way around the Sun fairly intact!
Most sunspot groups fizzle much quicker, their average "life expectancy" is only a few days. Occasionally one will make it all the way around the Sun in about 28 days. AR2665 is one of those few that make it that long recently.
Here are some full Sun images from prior imaging of AR 2665 that will show the rotation, size, and location of this sunspot group:
All images taken with this setup:
Scope: Daystar 80mm diameter, 500mm focal length APO refractor
Filters: Yellow Filter, IR Cut Filter
Camera: 5 Mpix CMOS MONO camera, by Pt Grey (GS3-U3-51S5M-C)
Solar Filter on scope: by Thousand Oaks #S4250
Post-processing: added color (more pleasing that gray)
August 2, 2017
Sunspots move from left to right.
August 2, 2017
This is a close up of AR 2665
Most sunspot groups fizzle much quicker, their average "life expectancy" is only a few days. Occasionally one will make it all the way around the Sun in about 28 days. AR2665 is one of those few that make it that long recently.
Here are some full Sun images from prior imaging of AR 2665 that will show the rotation, size, and location of this sunspot group:
July 8, 2017
July 10, 2017
July 13, 2017
And the size and shape of AR 2665 also was constantly changing:
July 8, 2017
July 9, 2017
July 10, 2017
July 13, 2017
Scope: Daystar 80mm diameter, 500mm focal length APO refractor
Filters: Yellow Filter, IR Cut Filter
Camera: 5 Mpix CMOS MONO camera, by Pt Grey (GS3-U3-51S5M-C)
Solar Filter on scope: by Thousand Oaks #S4250
Post-processing: added color (more pleasing that gray)
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