2021 December 11 Sun - solar surface in Ca-K, with AR12904
3nd day with no sunspot.
AR12901 and AR12903 have all turned to the backside.
AR12904 is located at (S26W25). No sunspot is visible, leaving just patches of faculae.
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 December 11 Sun - solar surface in Ca-K, with AR12904
2021 December 11 Sun - solar surface in Ca-K, with AR12904
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