Sunspot drawing of 1987-12-11

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https://doi.org/10.7891/e-manuscripta-142855



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1987-12-11
09:00
Hs 1304.6:2074
https://doi.org/10.7891/e-manuscripta-142855
Observer : Sergio Cortesi
Seeing (SIDC) : 3
Group Not Weighted Weighted Type Latitude Carrington Longit.
141 7 15 C -21 236
144 2 2 B -20 224
2 9 17