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HD 49947

HD 49947
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]
Distance459 ± 1 ly
(140.6 ± 0.4 pc)
Absolute magnitude (MV)+0.68[2]
Details[7]
Mass2.07±0.06 M☉
Radius10.33±0.13 R☉
Luminosity58.3±0.9 L☉
Surface gravity (log g)2.65±0.06 cgs
Temperature4,964±25 K
Metallicity [Fe/H]−0.17±0.02 dex
Rotational velocity (v sin i)1.1±1.4[8] km/s
Age1.27[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
SIMBADdata

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

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]

  1. ^ a b c d Cite error: The named reference GaiaEDR3 was invoked but never defined (see the help page).
  2. ^ a b Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Laney2011 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Houk1975 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Johnson1966 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference Steinmetz2020 was invoked but never defined (see the help page).
  7. ^ a b c d e Cite error: The named reference Ottoni2022 was invoked but never defined (see the help page).
  8. ^ a b Cite error: The named reference DeMederios2014 was invoked but never defined (see the help page).
  9. ^ a b Cite error: The named reference Dotter2008 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference Gould1879 was invoked but never defined (see the help page).

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