Triple star system in the constellation Cassiopeia
48 Cassiopeiae Observation dataEpoch J2000 Equinox J2000 Constellation Cassiopeia Right ascension 02h 01m 57.45035s [ 1] Declination +70° 54′ 25.2902″[ 1] Apparent magnitude (V)4.49[ 2] Characteristics Spectral type A3 Va[ 3] [ 4] B−Vcolor index ± 0.008[ 2] Astrometry Radial velocity (Rv )−12.4[ 5] km/s Proper motion (μ)RA: −55.69[ 1] mas /yr Dec.: −8.71[ 1] mas /yr Parallax (π)28.36± 0.44 mas [ 1] Distance 115 ± 2 ly pc ) Absolute magnitude (MV )1.75[ 2] Orbit [ 6] Primary 48 Cas A Companion 48 Cas B Period (P)± 0.05yr Semi-major axis (a)± 0.002Eccentricity (e)± 0.001Inclination (i)± 0.9Longitude of the node (Ω)± 3.2Periastron epoch (T)964 .35± 0.09Argument of periastron (ω)± 3.6Details 48 Cas A Mass 1.93[ 7] M ☉ Luminosity +0.6 [ 8] L ☉ Surface gravity (log g )4.47[ 9] cgs Temperature ± 290[ 9] K Metallicity −0.4[ 5] dex Rotational velocity (v sin i )61[ 8] Age 376[ 9] Myr 48 Cas B Mass 1.17[ 7] M ☉ Other designations A Cassiopeiae ,48 Cas ,BD +70° 153HD 12111HIP 9480HR 575SAO 4554ADS 1598CCDM J02020+7054WDS J02020+7054AB[ 10] Database references SIMBAD data
48 Cassiopeiae is atriple star [ 11] [ 7] constellation ofCassiopeia . It is visible to the naked eye with a combinedapparent visual magnitude of 4.49.[ 2] parallax shift of± 0.44 mas light years away.[ 1] radial velocity of −12.4 km/s.[ 5]
The primary component, designated48 Cassiopeiae A , is a whiteA-type main-sequence star with astellar classification of A2 V[ 4] apparent magnitude of +4.65.[ 12] F-type main-sequence star of class F2 V[ 4] [ 12] centre of mass once every 61.1 years.[ 6] semimajor axis of 0.614arcseconds and aneccentricity of 0.355.[ 6] [ 12] angular separation of 23.16 arcseconds as of 2014, or at least 816.5 AU away.[ 7]
48 Cassiopeiae also has theBayer designation A Cassiopeiae, the only star with a Latin letter designation in the constellation.[ 13]
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