Abell39.jpg
Abell39, Herkules Bubble, ↕ 3800 LY, Ø 4', ☼ 15, 880 mm, ƒ4.5, Gain 80, 2x23*5 min H&O, # 4x3 mm, Triel (Bortle 4.1; 6x), 15.08.26