Sunspot drawing of 2019-9-17

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https://doi.org/10.7891/e-manuscripta-160448



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2019-09-17
08:15
Hs 1304.6:11630
https://doi.org/10.7891/e-manuscripta-160448
Observer : Marco Cagnotti
Seeing (SIDC) : 3
No group