21 Cas

21 Cas is a A-type (White) star located in the constellation Cassiopeia. It carries the designation 21 Cas.

Located approximately 303.4 light-years from Earth, 21 Cas resides within the broader disk of our Milky Way galaxy.

21 Cas is classified as a spectral class A star (A-type (White)) on the Harvard spectral classification system.

With an apparent magnitude of +5.64, 21 Cas sits near the limit of naked-eye visibility. It can be glimpsed without optical aid under dark skies, but binoculars will make observation much easier. Observers will note its blue-white hue, which corresponds to a B-V color index of +0.078.