2021 September 16 Sun - solar surface in Ca-K, with AR12866, AR12869 and AR12870.
In Ca-K, the solar surface is basically featureless, except for one or two patches of plages.
AR12866 is located at (S18W87). Nothing is visible.
AR12869 is located at (S34W89). Nothing is visible.
AR12870 is today located at (S31W27). Strips of plages are visible.
Sunspot count: group=0, sunspot=0, R=0
Telescope: Sharpstar AL-80 II, 8 cm f/6.25 APO refractor
Camera : ASI1600MM Pro, not cooled.
focal length : 500 mm f/6.25
filter: Lunt Ca-K Module B1200
approximately north is up, east to the left.
2021 September 16 Sun - solar surface in Ca-K, with AR12866, AR12869 and AR12870.
2021 September 16 Sun - solar surface in Ca-K, with AR12866, AR12869 and AR12870.
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