| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Mensa |
| Right ascension | 04h38m 21.7254s[1] |
| Declination | −77° 39′ 21.6185″[1] |
| Apparent magnitude (V) | 6.04 ± 0.01[2] |
| Characteristics | |
| Spectral type | K2 III[3] |
| U−B color index | +0.95[4] |
| B−V color index | +1.10[4] |
| Astrometry | |
| Radial velocity (Rv) | 10.3 ± 0.1[5] km/s |
| Proper motion (μ) | RA: −6.975[1] mas/yr Dec.: −11.166[1] mas/yr |
| Parallax (π) | 6.0377 ± 0.0223 mas[1] |
| Distance | 540 ± 2 ly (165.6 ± 0.6 pc) |
| Absolute magnitude (MV) | −0.05 |
| Details | |
| Mass | 1.28[6] M☉ |
| Radius | 17.99[7] R☉ |
| Luminosity | 116[8] L☉ |
| Surface gravity (log g) | 2[9] cgs |
| Temperature | 4,390[9] K |
| Metallicity [Fe/H] | −0.15[10] dex |
| Rotational velocity (v sin i) | <1[11] km/s |
| Other designations | |
13 G. Mensae, CPD−77°181, FK5 2350, GC 5750, HD 30479, HIP 21611, HR 1531, SAO 256116 | |
| Database references | |
| SIMBAD | data |
HD 30479 (HR 1531) is a solitary star in the southern circumpolar constellation Mensa. It has an apparent magnitude of 6.04,[2] making it barely visible to the naked eye even under ideal conditions. It is located at a distance of 540 light years[1] but is receding with a heliocentric radial velocityof10.3 km/s.[5]
HD 30479 has a stellar classification of K2 III,[3] indicating that it is an early K-type giant star and has an angular diameterof1.01±0.07 mas[9] (after limb darkening correction). This yields a radius 17.99[7] times that of the Sun at its estimated distance. At present it has 1.28[6] times the mass of the Sun and radiates at 116[8] times the luminosity of the Sun at an effective temperature of 4,390[9] K from its enlarged photosphere, which gives it an orange glow. HD 30479 is believed to be one of the metal-deficient members of the young disk population[10] with an iron abundance of 71%[10] that of the Sun. Currently, it spins leisurely with a projected rotational velocity less than 1 km/s,[11] common for giants.
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