Williamina Fleming discovered IC 4191 = Fleming 107 in 1907 on a Harvard objective prism plate taken at the Arequipa station.

400/500mm - 18" (7/7/05 - Magellan Observatory, Australia): this bright, compact planetary was picked up by blinking with an OIII filter at 128x. IC 4191 forms the northern vertex of a small, distinctive triangle with a mag 10.6 star 1.1' SE and a slightly fainter mag 11 star 1.6' SSW. Excellent contrast gain of 2-3 magnitudes using the OIII filter. Without a filter, the planetary has that distinctive bluish color of planetaries and is slightly non-stellar with an extremely high surface brightness. At 293x a very small disc, perhaps 4"-5" in size is visible. The magnitude appears very similar to the mag 10.6 star 1.1' SE. Located 40' WNW of mag 4.8 Eta Muscae.

Notes by Steve Gottlieb