Sunspot drawing of 1987-5-13

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https://doi.org/10.7891/e-manuscripta-142898



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1987-05-13
08:45
Hs 1304.6:1904
https://doi.org/10.7891/e-manuscripta-142898
Observer : Sergio Cortesi
Seeing (SIDC) : 3
Group Not Weighted Weighted Type Latitude Carrington Longit.
42 9 11 C -31 115
44 4 6 B 27 118
2 13 17