Sunspot drawing of 2017-4-13

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https://doi.org/10.7891/e-manuscripta-159504



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2017-04-13
08:30
Hs 1304.6:10905
https://doi.org/10.7891/e-manuscripta-159504
Observer : Sergio Cortesi
Seeing (SIDC) : 3
Group Not Weighted Weighted Type Latitude Carrington Longit.
30 2 5 C 8.2 192.6
31 3 3 B 12.4 186.0
2 5 8