Sunspot drawing of 1987-9-17

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https://doi.org/10.7891/e-manuscripta-142807



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1987-09-17
07:00
Hs 1304.6:2019
https://doi.org/10.7891/e-manuscripta-142807
Observer : Sergio Cortesi
Seeing (SIDC) : 4
Group Not Weighted Weighted Type Latitude Carrington Longit.
97 10 15 C -31 226
99 1 1 A 18 216
100 1 1 A 24 233
101 1 3 J 13 131
4 13 20