Sunspot drawing of 1987-12-21

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https://doi.org/10.7891/e-manuscripta-142960



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1987-12-21
09:00
Hs 1304.6:2084
https://doi.org/10.7891/e-manuscripta-142960
Observer : Sergio Cortesi
Seeing (SIDC) : 2
Group Not Weighted Weighted Type Latitude Carrington Longit.
147 1 5 J -33 63
150 2 3 B -35 50
151 1 1 A 24 13
3 4 9