2021 April 21 Sun - solar surface in white-light, with AR12815, AR12816, AR12817 and AR12818

[PTS]

2021 April 21 Sun - solar surface in white-light, with AR12815, AR12816, AR12817 and AR12818

AR12815 is close to the SE limb, at (S21W77). No sunspot is visible.
AR12816 is today located at (S24E08). This group has been very active in the past 24 hours. At least 8 sunspots are visible, many come with penumbrae.
AR12817 is located at (N18W60). This Class-D group has at least 8 sunspots.
AR12818 is near the SE limb, at (S17E66). A large sunspot with penumbrae is visible, together with faculae, mostly to the south.
sunspot count: group=3, sunspot=17, R=47

Telescope: Celestron C5, 127mm f/10 Schmidt-Cassegrain
Camera : ASI1600MM Pro, not cooled
focal length : 1250 mm f/10
Filters: Baader Solar Film 5.0
approximately north is up, east to the left

[PTS]

Images of AR12816

[PTS]

Images of AR12817

[PTS]

Images of AR12818

[Eddy So]