Lambda Horologii
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Horologium |
| Right ascension | 02h 24m 53.91034s |
| Declination | −60° 18′ 43.0170″ |
| Apparent magnitude (V) | +5.35 |
| Characteristics | |
| Spectral type | F2III |
| B−V color index | +0.39 |
| Astrometry | |
| Radial velocity (Rv) | +28.34±0.41 km/s |
| Proper motion (μ) | RA: −71.892 mas/yr Dec.: −131.088 mas/yr |
| Parallax (π) | 21.0119±0.1004 mas |
| Distance | 155.2 ± 0.7 ly (47.6 ± 0.2 pc) |
| Absolute magnitude (MV) | +1.91 |
| Details | |
| Mass | 1.76 M☉ |
| Radius | 2.74+0.11 −0.16 R☉ |
| Luminosity | 13.3±0.1 L☉ |
| Surface gravity (log g) | 3.66 cgs |
| Temperature | 6,848 K |
| Metallicity [Fe/H] | −0.12 dex |
| Rotational velocity (v sin i) | +140 km/s |
| Age | 1.4 Gyr |
| Other designations | |
| λ Hor, CPD−60°199, FK5 84, HD 15233, HIP 11258, HR 714, SAO 248555 | |
| Database references | |
| SIMBAD | data |
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. 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. Although Eggleton and Tokovinin (2008) list this as a single star, according to Kunzli and North (1998) it may be a binary system with a long orbital period.
The visible component has a stellar classification of F2III, matching an evolved star that has, at the age of 1.4 billion years, become a giant. However, it has just 2.74 times the Sun's radius and shows a high rate of spin with a projected rotational velocity of +140 km/s. The star has 1.76 times the mass of the Sun and is radiating 13 times the Sun's luminosity from its photosphere at an effective temperature of 6,848 K.