Sunspot drawing of 2017-6-9

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https://doi.org/10.7891/e-manuscripta-159650



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2017-06-09
07:45
Hs 1304.6:10951
https://doi.org/10.7891/e-manuscripta-159650
Observer : Marco Cagnotti
Seeing (SIDC) : 3
No group