Albert Marth discovered NGC 6908 = m 411 on 24 Sep 1864 and noted "eF, vS, lE, (close to h2076 [= NGC 6907]." His position corresponds with the brighter trailing spiral arm, or more specifically the elongated companion that is superimposed on the northeastern arm. The companion is clearly visible on a deep image.

400/500mm - 18" (9/3/08): this number refers to the prominent spiral arm on the NE side where an anonymous galaxy (elongated N-S) is superimposed on the arm in roughly the same orientation! Visually the spiral arm hooks directly to the north from the east end of the central bar, just where the galaxy is located, though the galaxy was not distinguishable.

600/800mm - 24" (8/14/15): the companion galaxy superimposed on the eastern arm was clearly visible and fairly well defined, elongated 5:2 N-S, ~20"x8".

24" (7/25/14): A bright arm is attached at the east end of NGC 6907's bar and extends due north for 0.7', at a right angle to the bar. A bright, elongated N-S "knot" is embedded in the middle (superimposed companion NGC 6908). At the north end, the arm curls west a short distance while dimming out.

24" (9/15/12): the spiral arm that extends north on the eastern end of the bar of NGC 6907 contains a noticeable brightening on the north end that is actually a superimposed galaxy. The companion is elongated 3:1 N-S, 0.3'x0.1' and appears as a short streak within the arm. NGC 6908 may apply to the entire spiral arm or this elongated brightening (galaxy).

900/1200mm - 48" (10/25/14): at 610x; the elongated brightening in the northeast spiral arm appeared fairly bright, elongated 3:1 N-S, ~21"x7", very small bright core. This was the first time this object appeared as a superimposed galaxy and not just as a weak brightening in the arm itself.

Notes by Steve Gottlieb