Sunspot AR2673
Taken by Alessandro Bianconi on September 5, 2017 @ Dolianova (CA) Italy
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AR2673 2017.09.05 Truss Refractor 228 F8 (Kelvin) Daystar Quark Chromosphere Version ASI174MM FL = 7800mm
Photographer's website:
http://www.astrobin.com/users/sulcis2000/
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