HD 49947
Star in the constellation of Volans
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HD 49947 (HR 2531) is a solitary star in the southern circumpolar constellation Volans. It has an apparent magnitude of 6.36, placing it near the max naked eye visibility. Parallax measurements place the object at a distance of 459 light years but is receding with a heliocentric radial velocity of 15.88 km/s
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Volans |
| Right ascension | 06h 43m 36.7555s[1] |
| Declination | −73° 07′ 05.5512″[1] |
| Apparent magnitude (V) | 6.36[2] |
| Characteristics | |
| Evolutionary stage | Horizontal branch[3] |
| Spectral type | G8 III[4] |
| U−B color index | +0.66[5] |
| B−V color index | +0.96[5] |
| Astrometry | |
| Radial velocity (Rv) | 15.88±0.84[6] km/s |
| Proper motion (μ) | RA: +11.312 mas/yr[1] Dec.: −98.389 mas/yr[1] |
| Parallax (π) | 7.1106±0.0193 mas[1] |
| Distance | 459 ± 1 ly (140.6 ± 0.4 pc) |
| Absolute magnitude (MV) | +0.68[2] |
| Details[7] | |
| Mass | 2.07±0.06 M☉ |
| Radius | 10.33±0.13 R☉ |
| Luminosity | 58.3±0.9 L☉ |
| Surface gravity (log g) | 2.65±0.06 cgs |
| Temperature | 4,964±25 K |
| Metallicity [Fe/H] | −0.17±0.02 dex |
| Rotational velocity (v sin i) | 1.1±1.4[8] km/s |
| Age | 1.27[9] Gyr |
| Other designations | |
| 3 G. Volantis, CD−72°351, CPD−72°522, FK5 2522, GC 8881, HD 49947, HIP 32222, HR 2531, SAO 256330[10][11] | |
| Database references | |
| SIMBAD | data |
HD 49947 has a stellar classification of G8 III[4] and is a red clump giant, meaning that it is located on the warm end of the horizontal branch.[3] At present it has double the mass of the Sun[7] and at an age of 1.27 billion years,[9] has expanded to an enlarged radius of 10.33 solar radii.[7] It radiates at 61 times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 4,964 K,[7] giving a yellow hue. HD 49947 is metal deficient with an iron abundance 68% that of Sun[7] and spins very slowly.[8]