HD 106248
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  | |
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Chamaeleon[1] |
| Right ascension | 12h 13m 56.46291s[2] |
| Declination | −78° 34′ 26.1715″[2] |
| Apparent magnitude (V) | 6.34±0.01[3] |
| Characteristics | |
| Spectral type | K2/3 III CNII[4] |
| U−B color index | +1.41[5] |
| B−V color index | +1.21[5] |
| Astrometry | |
| Radial velocity (Rv) | 34.5±0.4[6] km/s |
| Proper motion (μ) | RA: −4.318 mas/yr[2] Dec.: −20.594 mas/yr[2] |
| Parallax (π) | 9.1183±0.0194 mas[2] |
| Distance | 357.7 ± 0.8 ly (109.7 ± 0.2 pc) |
| Absolute magnitude (MV) | +1.10[1] |
| Details | |
| Mass | 1.19±0.82[7] M☉ |
| Radius | 10.93[8] R☉ |
| Luminosity | 49+2.3 −2.2[7] L☉ |
| Surface gravity (log g) | 2.42[9] cgs |
| Temperature | 4,700±122[10] K |
| Metallicity [Fe/H] | +0.05[9] dex |
| Rotational velocity (v sin i) | <1.5[11] km/s |
| Age | 4.31+0.75 −0.48[2] Gyr |
| Other designations | |
| 39 G. Chamaeleontis[12], CD−77°542, CPD−77°804, GC 16698, HD 106248, HIP 59647, HR 4649, SAO 256915[13] | |
| Database references | |
| SIMBAD | data |
HD 106248, also known as HR 4649, is a solitary, orange hued star located in the southern circumpolar constellation Chamaeleon. It has an apparent magnitude of 6.34,[3] placing it near the limit for naked eye visibility. Based on parallax measurements from Gaia DR3, the object is estimated to be 358 light years away from the Solar System.[2] It appears to be receding with a heliocentric radial velocity of 34.5 km/s.[6] At its current distance, HD 106248's brightness is diminished by 0.32 due to interstellar dust and Eggen (1993) lists it as a member of the old (thick) disk population.[14]
This is an evolved red giant with a stellar classification of K2/3 III CNII[4]—intermediate between a K2 and K3 giant star. The CNII suffix indicates that it has a strong overabundance of cyano radicals in its spectrum, making it a CN star.[15] It has 119% the mass of the Sun[7] and is estimated to be 4.31 billion years old,[2] slightly younger than the Sun. However, HD 106248 has already left the main sequence and has an enlarged radius of 10.9 R☉.[8] It radiates 49 times the luminosity of the Sun from its photosphere[7] at an effective temperature of 4,700 K.[10] The star has a solar metallicity and spins slowly with a projected rotational velocity lower than 1.5 km/s.[11]
