This open cluster has been called after the Caroline Herschel. It is also known as The White Rose or Caroline’s Haystack (according to Interstellarum atlas). NGC7789 star open cluster is in the Cassiopeia constellation and can be spotted with naked eye under perfectly dark sky. Pretty large (over 15 arc minutes) and rich is an elegant view with any optical instrument. 
11.09.2016 it has been viewed with my 130mm refractor and Atik383 camera through RGB filters. Almost 2 hours of total exposure time with 3 minutes subframes.

NGC7789 Caroline's Rose open cluster
NGC7789 Caroline’s Rose open cluster

Full size here

Clear skies!