lifetime, with an age of about 600 million years. It has expanded to about 3.9 times the Sun's radius. An excess infrared emission has been observed at a wavelength of 60 μm, which suggests the presence of a circumstellar debris disk. This emission can be characterized by heat radiated from dust at a temperature of 85 K, which corresponds to an orbital radius of 88 Astronomical Units, or 88 times the distance of the Earth from the Sun. For comparison, the region of the remote Kuiper belt in the Solar System extends from 30–50 AU. The Washington Double Star Catalog lists a 12th magnitude companion away. It is an unrelated background object. References Cassiopeia (constellation) Cassiopeiae, Delta Eclipsing binaries A-type subgiants Ruchbah Cassiopeiae, 37 006686 0403 008538 Durchmusterung objects