Sunspot drawing of 2017-2-21

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https://doi.org/10.7891/e-manuscripta-159627



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2017-02-21
09:45
Hs 1304.6:10863
https://doi.org/10.7891/e-manuscripta-159627
Observer : Marco Cagnotti
Seeing (SIDC) : 2
Group Not Weighted Weighted Type Latitude Carrington Longit.
17 2 4 B 21.0 110.9
18 4 8 C 18.2 107.3
2 6 12