2 Cassiopeiae

2 Cassiopeiae (2 Cas) is a white bright giant in the constellation Cassiopeia, about 2,800 light years away. It is a chemically peculiar Am star.

2 Cassiopeiae has been described as an A4 type bright giant, buts its spectrum is not easy to classify. The calcium K absorption lines indicate a hotter type than the hydrogen lines, while other metals indicate a cooler type, possibly as cool as F0. This makes it an Am star, a type of magnetic chemically peculiar star with unusual abundances showing in its spectrum due to chemical stratification in its atmosphere caused by slow rotation.

About six times as massive as the Sun and 3,000 times as luminous, it has expanded away from the main sequence after exhausting its core hydrogen and now has an effective temperature of about $-13.58$. Some researchers have suggested that it is a post-AGB star.

2 Cassiopeiae has a number of close companions listed in multiple star catalogues, but none are thought to be gravitationally associated.