Beta Horologii

Beta Horologii, Latinized from β Horologii, is the third-brightest star in the southern constellation of Horologium. It is faintly visible to the naked eye with an apparent visual magnitude of 4.98.^[2] Based upon an annual parallax shift of 11.07 mas as seen from Earth,^[2] it is located about 295 light years from the Sun. The star is moving away with a radial velocity of +24 km/s.^[5]

β Horologii

Observation data Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation	Horologium
Right ascension	02h 58m 47.79642s[1]
Declination	−64° 04′ 16.6250″[1]
Apparent magnitude (V)	4.979[2]
Characteristics
Spectral type	A3/5 III(m)[3]
U−B color index	+0.15[4]
B−V color index	+0.13[4]
R−I color index	+0.05[4]
Astrometry
Radial velocity (Rv)	+23.6±2.8[5] km/s
Proper motion (μ)	RA: 22.074 ± 0.294[6] mas/yr Dec.: 5.825 ± 0.287[6] mas/yr
Parallax (π)	10.4568±0.1427 mas[6]
Distance	312 ± 4 ly (96 ± 1 pc)
Absolute magnitude (MV)	+0.20[7]
Details
Radius	1.40[8] R☉
Luminosity	63[9] L☉
Temperature	8,303[9] K
Rotational velocity (v sin i)	115[10] km/s
Other designations
β Hor, CPD−64°215, FK5 2212, GC 3611, HD 18866, HIP 13884, HR 909, SAO 248701, PPM 353263[2]
Database references
SIMBAD	data

This is a solitary,^[11] A-type giant with a stellar classification of A3/5 III(m).^[3] It is a suspected chemically peculiar star of the metallic-line type.^[12] Beta Horologii has a relatively high rate of spin with a projected rotational velocity of 115 km/s, giving it an oblate shape with an equatorial bulge that is an estimated 10% wider compared to the polar radius.^[10] It has about 1.40^[8] times the radius of the Sun and is radiating 63^[9] times the Sun's luminosity from its photosphere at an effective temperature of 8,303 K.^[9]