- a northern constellation between Cepheus and Perseus.
- the wife of Cepheus and mother of Andromeda.
- the wife of Cepheus and mother of Andromeda
- a very conspicuous W-shaped constellation near the Pole Star. Cassiopeia A is a very strong radio and X-ray source, identified as the remnant of a supernova thought to have occurred in the late 17th century