Sunspot drawing of 1987-8-17

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https://doi.org/10.7891/e-manuscripta-142849



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1987-08-17
08:30
Hs 1304.6:1989
https://doi.org/10.7891/e-manuscripta-142849
Observer : Sergio Cortesi
Seeing (SIDC) : 4
Group Not Weighted Weighted Type Latitude Carrington Longit.
80 3 8 C -26 282
82 11 19 D -29 248
83 11 19 D -23 239
3 25 46