Sunspot drawing of 2017-5-9

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https://doi.org/10.7891/e-manuscripta-159662



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2017-05-09
07:30
Hs 1304.6:10925
https://doi.org/10.7891/e-manuscripta-159662
Observer : Marco Cagnotti
Seeing (SIDC) : 3
No group