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Eta Cassiopeiae (η Cassiopeiae, abbreviated Eta Cas, η Cas) is a binary star system in the northern constellation of Cassiopeia. Its binary nature was first discovered by William Herschel in August 1779. Based upon parallax measurements, the distance to this system is 19.42 light-years (5.95 parsecs) from the Sun. [1]
Its primary is a B-type main-sequence star, and the secondary an A-type main-sequence star. The secondary star may be an Am star. [4] Farther out are two other stars, designated components C and D. They are 76.1″, or about 1.27′, away from the central system. [9] Their combined spectrum matches that of another B-type main-sequence star. [6]
Iota Cassiopeiae is known to be a quintuple star system. The brightest star system, ι Cassiopeiae A, contains a white-colored A-type main-sequence star with a mean apparent magnitude of +4.61. [1] The primary is itself a tighter binary star system. The two stars were resolved by adaptive optics.
AO Cassiopeiae is a binary system composed of an O8 main sequence star and an O9.2 bright giant that respectively weigh anywhere between 20.30 and 57.75 times and 14.8 and 31.73 times the mass of the Sun. [35] The two massive stars are so close to each other they distort each other into egg-shapes. [36]
δ Cassiopeiae (Latinised to Delta Cassiopeiae) is the star's Bayer designation.WDS J01258+6014A is its designation in the Washington Double Star Catalog.. It also bore the traditional names Ruchbah and Ksora; the former deriving from the Arabic word ركبة rukbah meaning "knee", [9] and the latter appeared in a 1951 publication, Atlas Coeli (Skalnate Pleso Atlas of the Heavens) by Czech ...
Omicron Cassiopeiae (ο Cas, ο Cassiopeiae) is a triple star system in the constellation Cassiopeia. It is approximately 700 light-years from Earth, based on its parallax. [1] It is visible to the naked eye with a slightly variable apparent magnitude of about 4.5. A visual band light curve for Omicron Cassiopeiae, adapted from Koubský et al ...
Gamma Cassiopeiae is also a variable star and a multiple star system. Based upon parallax measurements made by the Hipparcos satellite, it is located at a distance of roughly 550 light-years from Earth. Together with its common-proper-motion companion, HD 5408, the system could contain a total of eight stars. [15]
A multiple star system consists of two or more stars that appear from Earth to be close to one another in the sky. [dubious – discuss] This may result from the stars actually being physically close and gravitationally bound to each other, in which case it is a physical multiple star, or this closeness may be merely apparent, in which case it is an optical multiple star [a] Physical multiple ...