Lost in the glare of Eta Cassiopeia primary star, Achird, is a dimmer companion. The two stars orbit each other in 480 years. Eta Cassiopeia A is a G type star much like our Sun and similar in size. Eta Cassiopeia B is a dimmer K type star.
Also visible in the image is a small planetary nebula PK122-04.1 in the upper left side, near the edge of the image.