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 | |
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]