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Star in the constellation Horologium From Wikipedia, the free encyclopedia
γ Horologii, Latinised as Gamma Horologii, is a solitary[7] star in the southern constellation of Horologium. It is just bright enough to be visible to the naked eye as a dim, yellow-hued point of light with an apparent visual magnitude of +5.74.[2] This object is located at a distance of 183 light years from the Sun, but is drifting closer with a radial velocity of −19 km/s.[1]
Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
---|---|
Constellation | Horologium |
Right ascension | 02h 45m 27.47800s[1] |
Declination | −63° 42′ 16.3925″[1] |
Apparent magnitude (V) | +5.743[2] |
Characteristics | |
Spectral type | G8 III/IV[3] |
B−V color index | +0.929[2] |
Astrometry | |
Radial velocity (Rv) | −18.79±0.16[1] km/s |
Proper motion (μ) | RA: +18.913[1] mas/yr Dec.: −8.742[1] mas/yr |
Parallax (π) | 17.7941 ± 0.0592 mas[1] |
Distance | 183.3 ± 0.6 ly (56.2 ± 0.2 pc) |
Absolute magnitude (MV) | +1.99[4] |
Details | |
Radius | 5.50+0.11 −0.08[1] R☉ |
Luminosity | 16.9±0.1[1] L☉ |
Surface gravity (log g) | 3.18±0.05[5] cgs |
Temperature | 4,961±24[5] K |
Metallicity [Fe/H] | −0.26±0.02[5] dex |
Other designations | |
Database references | |
SIMBAD | data |
The stellar classification of this object is G8 III/IV,[3] matching a G-type star with a luminosity class intermediate between a subgiant and giant star. This suggests it has exhausted the supply of hydrogen at its core and is evolving off the main sequence. It has 5.5[1] times the radius of the Sun and is radiating 17[1] times the Sun's luminosity from its swelling photosphere at an effective temperature of 4,961 K.[5] The metallicity is sub-solar,[5] indicating a lower abundance of elements more massive than helium, as compared to the Sun.