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Star in the constellation Horologium From Wikipedia, the free encyclopedia
λ Horologii, Latinised as Lambda Horologii, is a star in the southern constellation of Horologium. It is a yellow-white hued star that is dimly visible to the naked eye with an apparent visual magnitude of +5.35.[2] Based upon parallax, this object is located 155 light years distance from the Sun. It is drifting further away with a radial velocity of +28 km/s.[1] Although Eggleton and Tokovinin (2008) list this as a single star,[8] according to Kunzli and North (1998) it may be a binary system with a long orbital period.[9]
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Horologium |
Right ascension | 02h 24m 53.91034s[1] |
Declination | −60° 18′ 43.0170″[1] |
Apparent magnitude (V) | +5.35[2] |
Characteristics | |
Spectral type | F2III[3] |
B−V color index | +0.39[2] |
Astrometry | |
Radial velocity (Rv) | +28.34±0.41[1] km/s |
Proper motion (μ) | RA: −71.892[1] mas/yr Dec.: −131.088[1] mas/yr |
Parallax (π) | 21.0119 ± 0.1004 mas[1] |
Distance | 155.2 ± 0.7 ly (47.6 ± 0.2 pc) |
Absolute magnitude (MV) | +1.91[4] |
Details | |
Mass | 1.76[5] M☉ |
Radius | 2.74+0.11 −0.16[1] R☉ |
Luminosity | 13.3±0.1[1] L☉ |
Surface gravity (log g) | 3.66[6] cgs |
Temperature | 6,848[5] K |
Metallicity [Fe/H] | −0.12[5] dex |
Rotational velocity (v sin i) | +140[3] km/s |
Age | 1.4[5] Gyr |
Other designations | |
Database references | |
SIMBAD | data |
The visible component has a stellar classification of F2III,[3] matching an evolved star that has, at the age of 1.4 billion years,[5] become a giant. However, it has just 2.74[1] times the Sun's radius and shows a high rate of spin with a projected rotational velocity of +140 km/s.[3] The star has 1.76[5] times the mass of the Sun and is radiating 13[1] times the Sun's luminosity from its photosphere at an effective temperature of 6,848 K.[5]