Region of star cluster Messier 11.
Region of star cluster Messier 11., E.E. Barnard, 1905, July 30 centre of plate, R.A., 18h 45m decl, - 7.5 degree exposure, 5h, 30m. enlarged 2 times, 10-inch Bruce doublet of the Yerkes Observatory Hooker expedition to Mount Wilson, California