Delta Cassiopeiae

δ Cassiopeiae
Location of δ Cassiopeiae (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Cassiopeia
Right ascension 01h 25m 48.95147s[1]
Declination +60° 14′ 07.0225″[1]
Apparent magnitude (V) 2.68[2]
Characteristics
Spectral type A5 IV[3]
U−B color index +0.13[2]
B−V color index +0.13[2]
Variable type Algol?[4]
Astrometry
Radial velocity (Rv)−6.7[5] km/s
Proper motion (μ) RA: 296.57[1] mas/yr
Dec.: –49.22[1] mas/yr
Parallax (π)32.81 ± 0.14 mas[1]
Distance99.4 ± 0.4 ly
(30.5 ± 0.1 pc)
Absolute magnitude (MV)+0.28[6]
Details
Mass2.49[7] M☉
Radius3.90[8] R☉
Luminosity72.88[7] L☉
Temperature7,980[7] K
Rotational velocity (v sin i)123[7] km/s
Age6.0×108[8] years
Other designations
Ruchbah, Ksora,[9] Rucba, Rucbar,[10] 37 Cassiopeiae, BD+59°248, FK5 48, HD 8538, HIP 6686, HR 403, SAO 22268, WDS J01258+6014A[11]
Database references
SIMBADdata

Delta Cassiopeiae (δ Cassiopeiae, abbreviated Delta Cas, δ Cas) is an eclipsing binary star system in the northern circumpolar constellation of Cassiopeia. Based on parallax measurements taken during the Hipparcos mission, it is approximately 99.4 light-years (30.5 parsecs) from the Earth.[1]

Delta Cassiopeiae is the primary or 'A' component of a multiple star system designated WDS J01258+6014. Delta Cassiopeiae's two components are therefore designated WDS J01258+6014 Aa and Ab. Aa is officially named Ruchbah /ˈrʌkbə/, the traditional name for the system.[12][13]

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