10 Cassiopeiae

10 Cassiopeiae (10 Cas) is a blue-white giant star in the constellation Cassiopeia, about 960 light years away.

10 Cassiopeiae

Location of 10 Cassiopeiae (circled)
Observation data Epoch J2000.0      Equinox J2000.0
Constellation	Cassiopeia[1]
Right ascension	00h 06m 26.5374s[2]
Declination	+64° 11′ 46.169″[2]
Apparent magnitude (V)	5.54 - 5.59[3]
Characteristics
Spectral type	B9IIIe[3]
U−B color index	−0.19[4]
B−V color index	−0.03[4]
Variable type	suspected Be[3]
Astrometry
Radial velocity (Rv)	−0.61±0.54[2] km/s
Proper motion (μ)	RA: +9.248[2] mas/yr Dec.: +0.828[2] mas/yr
Parallax (π)	3.4070±0.0536 mas[2]
Distance	960 ± 20 ly (294 ± 5 pc)
Absolute magnitude (MV)	−1.863[5]
Details
Mass	3.2[6] M☉
Radius	8.3[7] R☉
Luminosity	920[8] L☉
Surface gravity (log g)	2.08[6] cgs
Temperature	11,351[8] K
Metallicity [Fe/H]	−0.01[5] dex
Rotation	1.07 d[9]
Rotational velocity (v sin i)	125[8] km/s
Age	218[10] Myr
Other designations
10 Cas, HR 7, HD 144, BD+63°2107, HIP 531, NSV 15021, MWC 2
Database references
SIMBAD	data

10 Cassiopeiae is a B9 giant star. It shows emission lines in its spectrum and is classified as a Be star. It shows slight variations in its brightness, between magnitudes 5.54 and 5.59.

At an age of 218 million years, 10 Cassiopeiae has expanded away from the main sequence after exhausting its core hydrogen and now has a radius about eight times that of the Sun. With an effective temperature of about 11,000 K, it emits nearly a thousand times the luminosity of the Sun.