  | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Phoenix |
| Right ascension | 01h 57m 10.08491s[1] |
| Declination | −47° 23′ 07.0936″[1] |
| Apparent magnitude (V) | 4.82[2] |
| Characteristics | |
| Spectral type | G6III-IIIb[3] |
| U−Bcolor index | +0.51[4] |
| B−Vcolor index | +0.88[4] |
| Astrometry | |
| Radial velocity (Rv) | +13.36±0.22[1] km/s |
| Proper motion (μ) | RA: +102.213[1]mas/yr Dec.: +16.301[1]mas/yr |
| Parallax (π) | 13.1010±0.2295 mas[1] |
| Distance | 249 ± 4 ly (76 ± 1 pc) |
| Absolute magnitude (MV) | 0.42[2] |
| Details | |
| Mass | 2.39[5] M☉ |
| Radius | 10.40+0.46 −0.70[1] R☉ |
| Luminosity | 71.1±1.4[1] L☉ |
| Surface gravity (log g) | 3.04[6] cgs |
| Temperature | 5,196+185 −112[1] K |
| Metallicity [Fe/H] | –0.02[6] dex |
| Rotational velocity (v sin i) | 5.7±1.0[7] km/s |
| Age | 1.08[5] Gyr |
| Other designations | |
| CD−47°597,GC 2369,HD 12055,HIP 9095,HR 574,SAO 215715[8] | |
| Database references | |
| SIMBAD | data |
HD 12055 is a candidateastrometric binary[9]star system in the southernconstellation ofPhoenix, near the eastern constellation border withEridanus. It is yellow in hue and is visible to the naked eye with anapparent visual magnitude of 4.82.[2] The system is located at a distance of approximately 249 light years from theSun based onparallax, and is drifting further away with aradial velocity of +13 km/s.[1]
The visible component is an aginggiant star with astellar classification of G6III-IIIb.[3] With the supply of hydrogen at itscore exhausted, the star has cooled and expanded off themain sequence – at present it has ten[1] times thegirth of the Sun. It is around a billion[5] years old with 2.4[5] times themass of the Sun and is spinning with aprojected rotational velocity of 6 km/s.[7] The star is radiating 71 times theluminosity of the Sun from itsphotosphere at aneffective temperature of 5,196 K.[1]
This system is the most likely source ofX-ray emission coming from these coordinates.[10]
