2022-09-04 M8+M20(Hα-HαGB) ASI533MMpro sharpstar 61edph Ⅱ メシエ天体 M820220830ASI533mm procooling +(0°)sharpstar 61edph Ⅱ +reducerguide asiair pro Hα-HαGBHα:gain360 120s×30stacks dark+flat-G:gain360 10s×30stacks dark+flat-B:gain360 10s×30stacks dark+flat- SI9でHα-HαGBの要領でカラー合成。星マスクで少し星の色に気をつけてみた。