Descripción

NGC 225 is an open cluster located in the constellation of Cassiopeia, at about 2200 light-years away. It has an estimated age of 100-150 million years old, and more than half of its members are double or multiple stars. On 27 September 1783 Caroline Herschel discovered the open clusters NGC 225 along with NGC 189 using her 4.2-inch comet-seeker reflector. She described it as follows: “about 2° from Gamma Cas, making an isosceles triangle with Gamma and Kappa, a small cluster of stars, seeming to be intermixed with nebulosity.”
In 1962 the American astronomer Beverly T. Lynds published her “Catalogue of Dark Nebulae” that she found on the blue and red photo plates of the “National Geographic Palomar Observatory Sky Atlas”. She identified several patches of dark nebulosity around cluster NGC 225. In 1965 she published then her catalogue of bright nebulae where she identified a small H II region with LBN 604. In 1966 the Canadian astronomer Sidney van den Bergh published his “Catalogue of Reflection Nebulae”, which was based on a survey on the photographic plates of the Palomar Observatory Sky Survey. There he identified the reflection nebula vdB 4 with strong absorption around the star V594 Cas, but with the classification he was uncertain.

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