Omicron Andromedae is a binary star, whose two components are both spectroscopic binaries themselves, making a four star system. The system as a whole is classified as a blue-white B-type giant with a mean combined apparent magnitude of +3.62.
The separation of the two brightest components, ο Andromedae A and ο Andromedae B is 0.34 arcseconds. They have an orbital period of 68.6 years. A is separated from its spectroscopic companion by 0.05 arcseconds. A is a Gamma Cassiopeiae type variable star and the system's brightness varies from magnitude +3.58 to +3.78. This, in turn, has made determination the orbital period of A's spectroscopic binary difficult. B's spectroscopic companion was discovered in 1989, and that binary has a period of 33.01 years.
|NAME||Right ascension||Declination||Apparent magnitude (V)||Spectral type||Database references|
|ο Andromedae a (BLA 12Aa)||23h 01m 55.2643s||+42° 19' 33.525''||3.62||B6III+A2||Simbad|
|ο Andromedae B (WRH 37AB)||3.6||Simbad|