HD 49268
Star in the constellation Volans
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HD 49268 (HR 2505) is a solitary star in the southern circumpolar constellation Volans. It has an apparent magnitude of +6.49,[2] placing it near the limit of naked eye visibility. Parallax measurements place the object at a distance of 456 light years;[1] it is receding with a heliocentric radial velocity of 20.6 km/s.[5]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Volans |
| Right ascension | 06h 40m 57.6024s[1] |
| Declination | −71° 46′ 30.6872″[1] |
| Apparent magnitude (V) | 6.49±0.01[2] |
| Characteristics | |
| Spectral type | K1 III CNII[3] |
| U−B color index | +1.06[4] |
| B−V color index | +1.11[4] |
| Astrometry | |
| Radial velocity (Rv) | 20.6±0.4[5] km/s |
| Proper motion (μ) | RA: +21.453 mas/yr[1] Dec.: −40.165 mas/yr[1] |
| Parallax (π) | 7.1467±0.0222 mas[1] |
| Distance | 456 ± 1 ly (139.9 ± 0.4 pc) |
| Absolute magnitude (MV) | +0.89[6] |
| Details | |
| Mass | 1.36[7] M☉ |
| Radius | 10.77[8] R☉ |
| Luminosity | 60.2+2.8 −2.7[9] L☉ |
| Surface gravity (log g) | 2.48[7] cgs |
| Temperature | 4,660±90[9] K |
| Metallicity [Fe/H] | +0.07[10] dex |
| Rotational velocity (v sin i) | <1.6[11] km/s |
| Other designations | |
| 2 G. Volantis, CD−71°357, CPD−71°476, HD 49268, HIP 31977, HR 2505, SAO 256326, WDS J06410-7147A[12][13] | |
| Database references | |
| SIMBAD | data |
The stellar classification of HD 49268 is K1 III CNII,[3] indicating that it is an ageing red giant with a strong over-abundance of cyano radical in its stellar atmosphere. It has 136% the mass of the Sun[7] but expanded to 10.77 times its girth.[8] It is radiating 60 times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 4,660 K,[9] giving it an orange hue. HD 49268 is slightly metal enriched with an iron abundance 117% that of the Sun and is believed to be a member of the thick disk population.[10] It spins leisurely with a projected rotational velocity that is lower than 1.6 km/s.[11]
HD 49268 has two faint companions listed in the Washington Double Star Catalogue: a tenth magnitude star 17″ away; and a 13th magnitude star 65″ away. Both are unrelated background stars.[14]