Epsilon Cassiopeiae

Epsilon Cassiopeiae
Location of ε Cas (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Cassiopeia
Right ascension 01h 54m 23.73409s[1]
Declination +63° 40′ 12.3602″[1]
Apparent magnitude (V) 3.37[2]
Characteristics
Spectral type B3 V[3]
U−B color index −0.62[2]
B−V color index −0.15[2]
Variable type Periodic[4]
Astrometry
Radial velocity (Rv)−8.1[5] km/s
Proper motion (μ) RA: +29.587[1] mas/yr
Dec.: −18.387[1] mas/yr
Parallax (π)7.0037 ± 0.1599 mas[1]
Distance470 ± 10 ly
(143 ± 3 pc)
Absolute magnitude (MV)−2.19[6]
Details
Mass9.2±0.2[7] M☉
Radius6.10±0.06[1] R☉
Luminosity3,059[1] L☉
Surface gravity (log g)3.5[8] cgs
Temperature15,174[8] K
Metallicity [Fe/H]−0.28[1] dex
Rotational velocity (v sin i)30[9] km/s
Age15.4±3.0[7] Myr
Other designations
Segin, Epsilon Cas, ε Cas, 45 Cassiopeiae, BD+62 320, FK5 63, HD 11415, HIP 8886, HR 542, SAO 12031
Database references
SIMBADdata

Epsilon Cassiopeiae or ε Cassiopeiae, officially named Segin (/ˈsɛɡɪn/),[10][11] is a single[12] star in the northern constellation of Cassiopeia. With an apparent visual magnitude of 3.4, this is one of the brightest stars in the constellation. The distance to this star has been determined directly using parallax measurements, yielding a value of around 460–430 light-years (140–130 parsecs) from the Sun. It is drifting closer with a radial velocity of −8 km/s.[5]

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