48 Cassiopeiae

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48 Cassiopeiae A/B
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Cassiopeia
Right ascension 02h01m57.4s
Declination +70°54′25″
Apparent magnitude (V) +4.71/+6.41
Characteristics
Spectral type A3IV
U−B color index +0.06
B−V color index +0.16
Variable type none
Astrometry
Radial velocity (Rv) −5 km/s
Proper motion (μ) RA: −54.46 mas/yr
Dec.: −10.69 mas/yr
Parallax (π) 27.91 ± 0.56 mas
Distance 116.9 ly
(35.83 pc)
Absolute magnitude (MV) +1.72
Orbit
Companion 48 Cassiopeiae B
Period (P) 60.5 yr
Semi-major axis (a) 0.62"
Eccentricity (e) 0.36
Inclination (i) 17°
Longitude of the node (Ω) 44°
Periastron epoch (T) 1965.00
Other designations
A Cassiopeiae, HR 575, HD 12111, BD+70°153, HIP 9480, SAO 4554, GC 2424, ADS 1598, CCDM J02020+7054

48 Cassiopeiae is a star system in the constellation Cassiopeia. It is approximately 116.9 light years from Earth.

The primary component, 48 Cassiopeiae A, is a white A-type subgiant with an apparent magnitude of +4.71. It has an astrometric companion, 48 Cassiopeiae B, which is a F-type main sequence dwarf with an apparent magnitude of +6.41. These two stars orbit around their common centre of mass once every 60.5 years. Component B has a semi-major axis of 0.62 arcseconds, or 22 AU. A third companion, 48 Cassiopeiae C, is a fourteenth magnitude star located 24 arcseconds, or at least 850 AU, away. The primary is also a spectroscopic binary, and has an unresolved companion, meaning the system has at least four components.