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]
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 | |
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]
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