1 Cassiopeiae

1 Cassiopeiae is a single^[10] star in the northern constellation of Cassiopeia, located around 1,130 light years from the Sun.^[2] It is visible to the naked eye as a faint, blue-white hued star with an apparent visual magnitude of +4.84.^[1] This object is moving closer to the Earth with a heliocentric radial velocity of −9 km/s.^[1]

1 Cassiopeiae

Observation data Epoch J2000.0      Equinox J2000.0
Constellation	Cassiopeia[1]
Right ascension	23h 06m 36.818s[2]
Declination	+59° 25′ 11.14″[2]
Apparent magnitude (V)	+4.84[1]
Characteristics
Spectral type	B0.5 III[3]
U−B color index	−0.87
B−V color index	−0.060±0.004[1]
Astrometry
Radial velocity (Rv)	−9.1±0.9[1] km/s
Proper motion (μ)	RA: 6.94±0.14[2] mas/yr Dec.: −1.95±0.14[2] mas/yr
Parallax (π)	2.89±0.13 mas[2]
Distance	1,130 ± 50 ly (350 ± 20 pc)
Absolute magnitude (MV)	−2.91[1]
Details
Mass	13.1[4] M☉
Radius	10.2[5] R☉
Luminosity	18,200[4] L☉
Surface gravity (log g)	3.98[4] cgs
Temperature	27,200[4] K
Metallicity [Fe/H]	−0.40[6] dex
Rotational velocity (v sin i)	31[7] km/s
Age	5.7±0.1[8] Myr
Other designations
1 Cas, BD+58°2545, FK5 1201, HD 218376, HIP 114104, HR 8797, SAO 35147[9]
Database references
SIMBAD	data

The stellar classification of 1 Cassiopeiae is B0.5 III,^[3] matching an evolved B-type giant star. It is 5.7^[8] million years old with a projected rotational velocity of 31.^[7] The star has 13.1^[4] times the mass of the Sun and 10.2^[5] times the Sun's radius. It is radiating 18,200^[4] times the Sun's luminosity from its photosphere at an effective temperature of 27,200 K.^[4]