HD 30479

HD 30479
Observation data
Epoch J2000      Equinox J2000
Constellation Mensa
Right ascension 04h 38m 21.7254s[1]
Declination −77° 39′ 21.6185″[1]
Apparent magnitude (V) 6.04 ± 0.01[2]
Characteristics
Spectral type K2 III[3]
U−B color index +0.95[4]
B−V color index +1.10[4]
Astrometry
Radial velocity (Rv)10.3 ± 0.1[5] km/s
Proper motion (μ) RA: −6.975[1] mas/yr
Dec.: −11.166[1] mas/yr
Parallax (π)6.0377 ± 0.0223 mas[1]
Distance540 ± 2 ly
(165.6 ± 0.6 pc)
Absolute magnitude (MV)−0.05
Details
Mass1.28[6] M☉
Radius17.99[7] R☉
Luminosity116[8] L☉
Surface gravity (log g)2[9] cgs
Temperature4,390[9] K
Metallicity [Fe/H]−0.15[10] dex
Rotational velocity (v sin i)<1[11] km/s
Other designations
13 G. Mensae, CPD−77°181, FK5 2350, GC 5750, HD 30479, HIP 21611, HR 1531, SAO 256116
Database references
SIMBADdata

HD 30479 (HR 1531) is a solitary star in the southern circumpolar constellation Mensa. It has an apparent magnitude of 6.04,[2] making it barely visible to the naked eye even under ideal conditions. It is located at a distance of 540 light years[1] but is receding with a heliocentric radial velocity of 10.3 km/s.[5]

HD 30479 has a stellar classification of K2 III,[3] indicating that it is an early K-type giant star and has an angular diameter of 1.01±0.07 mas[9] (after limb darkening correction). This yields a radius 17.99[7] times that of the Sun at its estimated distance. At present it has 1.28[6] times the mass of the Sun and radiates at 116[8] times the luminosity of the Sun at an effective temperature of 4,390[9] K from its enlarged photosphere, which gives it an orange glow. HD 30479 is believed to be one of the metal-deficient members of the young disk population[10] with an iron abundance of 71%[10] that of the Sun. Currently, it spins leisurely with a projected rotational velocity less than 1 km/s,[11] common for giants.

  1. ^ a b c d e f Cite error: The named reference GaiaEDR3 was invoked but never defined (see the help page).
  2. ^ a b Cite error: The named reference Tycho2000 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Houk1975 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Johnson1966 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference Anders2019 was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference Lang2006 was invoked but never defined (see the help page).
  8. ^ a b Cite error: The named reference McDonald2017 was invoked but never defined (see the help page).
  9. ^ a b c d Cite error: The named reference Lafrasse2010 was invoked but never defined (see the help page).
  10. ^ a b c Cite error: The named reference Eggen1994 was invoked but never defined (see the help page).
  11. ^ a b Cite error: The named reference DeMederios2014 was invoked but never defined (see the help page).