HD 179433

HD 179433
Location of HD 179433 (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Corona Australis
Right ascension 19h 14m 39.56095s[1]
Declination −45° 11′ 36.6990″[1]
Apparent magnitude (V) 5.91±0.01[2]
Characteristics
Spectral type G8 III[3]
B−V color index +0.90[4]
Astrometry
Radial velocity (Rv)−35.1±0.4[5] km/s
Proper motion (μ) RA: +47.604[1] mas/yr
Dec.: −39.804[1] mas/yr
Parallax (π)9.9058 ± 0.0428 mas[1]
Distance329 ± 1 ly
(101.0 ± 0.4 pc)
Absolute magnitude (MV)+1.11[6]
Details[7]
Mass2.45±0.04 M☉
Radius8.26±0.14 R☉
Luminosity43.3±1.0 L☉
Surface gravity (log g)2.88±0.07 cgs
Temperature5,120±30 K
Metallicity [Fe/H]−0.004±0.027 dex
Rotational velocity (v sin i)2.9±1[8] km/s
Age727±10[9] Myr
Other designations
49 G. Coronae Australis[10], CD−45°13054, CPD−45°9650, GC 26485, HD 179433, HIP 94556, HR 7281, SAO 229573[11]
Database references
SIMBADdata

HD 179433, also known as HR 7281 or rarely 49 G. Coronae Australis, is a solitary star located in the southern constellation Corona Australis. It is faintly visible to the naked eye as a yellow-hued point of light with an apparent magnitude of 5.91.[2] Gaia DR3 parallax measurements imply a distance of 329 light-years,[1] and it is currently drifting closer with a heliocentric radial velocity of −35.1 km/s.[5] At its current distance, HD 179433's brightness is diminished by interstellar extinction of 0.22 magnitudes[12] and it has an absolute magnitude of +1.11.[6]

HD 179433 has a stellar classification of G8 III,[3] indicating that it is an evolved red giant. It has 2.45 times the mass of the Sun[7] but at the age of 727 million years,[9] it has expanded to 8.26 times the Sun's radius.[7] It radiates 43.3 times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 5,120 K.[7] HD 197433 has a near solar metallicity at [Fe/H]= −0.0004[7] and it spins modestly with a projected rotational velocity of 2.9 km/s.[8]

  1. ^ a b c d e f Cite error: The named reference GaiaDR3 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 Houk1978 was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference Corben1971 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Gontcharov2006 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference Anderson2012 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 De Medeiros2014 was invoked but never defined (see the help page).
  9. ^ a b Cite error: The named reference Gomes da Silva2021 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Gould1879 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference Gontcharov2017 was invoked but never defined (see the help page).