JosÃ© J. ChambÃ³
GSO 8″ 760mm. f/3.8 & Atik 383L+
Comet C/2017 O1 (ASASSN) photographed on October 21th 2017, at time begun to go away from Sun as Earth. In spite of had a brightness drop of half magnitude until 8.5, still shown photographically a coma with 10′ diameter, alhough with external layer very difuse, and also a faint tail of 20′ long toward southwest.