HD 46815
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  | |
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Columba[1] |
| Right ascension | 06h 33m 49.4800s[2] |
| Declination | −36° 13′ 55.295″[2] |
| Apparent magnitude (V) | 5.40±0.01[3] |
| Characteristics | |
| Spectral type | K3 III[4] |
| U−B color index | +1.72[5] |
| B−V color index | +1.42[5] |
| Astrometry | |
| Radial velocity (Rv) | 32.2±2.8[6] km/s |
| Proper motion (μ) | RA: −15.622 mas/yr[2] Dec.: +99.481 mas/yr[2] |
| Parallax (π) | 7.9846±0.0528 mas[2] |
| Distance | 408 ± 3 ly (125.2 ± 0.8 pc) |
| Absolute magnitude (MV) | +0.03[1] |
| Details | |
| Mass | 1.17[7] M☉ |
| Radius | 24.15[8] R☉ |
| Luminosity | 180±2[9] L☉ |
| Surface gravity (log g) | 1.68[7] cgs |
| Temperature | 4,297±122[8] K |
| Metallicity [Fe/H] | +0.08[10] dex |
| Rotational velocity (v sin i) | 2.3±1.2[11] km/s |
| Other designations | |
| 106 G. Columba, CD−36°2990, CPD−36°994, GC 8559, HD 46815, HIP 31299, HR 2411, SAO 196945[12][13] | |
| Database references | |
| SIMBAD | data |
HD 46815 (HR 2411) is a solitary[14] star in the southern constellation Columba. It is faintly visible to the naked eye with an apparent magnitude of 5.4 and is estimated to be 408 light years away.[2] However, it is receding with a heliocentric radial velocity of 32.2 km/s.[6]
HD 46815 has a stellar classification of K3 III,[4] indicating that it is a red giant. At present it has 117% the mass of the Sun[7] but has expanded to 24.15 times its girth.[8] It shines with a luminosity of 180 L☉[9] from its enlarged photosphere at an effective temperature of 4,297 K,[8] giving an orange hue. HD 46815 has a metallicity 120% that of the Sun and is believed to be a member of the old disk.[10] Due to it being a giant star, it has a low projected rotational velocity of 2.3 km/s.[11]
