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HD 175219

HD 175219
Location of HD 175219 (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Corona Australis
Right ascension 18h 56m 16.95125s[1]
Declination −42° 42′ 38.4231″[1]
Apparent magnitude (V) 5.35±0.01[2]
Characteristics
Spectral type K0 III[3] or G6 III-IV[4]
B−V color index +1.00[5]
Astrometry
Radial velocity (Rv)−21.1±0.8[6] km/s
Proper motion (μ) RA: −27.046 mas/yr
Dec.: −29.284 mas/yr
Parallax (π)10.3847 ± 0.109 mas[1]
Distance314 ± 3 ly
(96 ± 1 pc)
Absolute magnitude (MV)+0.57[7]
Details
Mass1.93±0.21[8] M☉
Radius12.3±0.2[8] R☉
Luminosity76.3±2.0[8] L☉
Surface gravity (log g)2.55±0.07[8] cgs
Temperature4,877±26[8] K
Metallicity [Fe/H]−0.28±0.02[8] dex
Rotational velocity (v sin i)<1[9] km/s
Age346[1] Myr
Other designations
30 G. Coronae Australis[10], CD−42°13761, CPD−42°8539, GC 25956, HD 175219, HIP 92953, HR 7122, SAO 229383[11]
Database references
SIMBADdata

HD 175219, also known as HR 7122, is a solitary,[12] orange hued star located in the southern constellation Corona Australis. It has an apparent magnitude of 5.35,[2] allowing it to be faintly visible to the naked eye. The object is located relatively close at a distance of 314 light years based on Gaia DR3 parallax measurements[1] but is drifting closer with a heliocentric radial velocity of −21.1 km/s.[6] At its current distance, HD 175219's brightness is diminished by 0.26 magnitudes due to interstellar dust.[13] It has an absolute magnitude of +0.57.[7]

This is a red giant with a stellar classification of K0 III.[3] An earlier source gives it a class of G6 III-IV,[4] indicating that it is an evolved G-type star with a luminosity class intermediate between a giant star and a subgiant. At present it has nearly twice the mass of the Sun but it has expanded to 12.3 times the Sun's radius.[8] HD 175219 radiates 76.3 times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 4,877 K.[8] The star is metal deficient, having less than half the abundance of heavy elements compared to the Sun.[8] Common for giant stars, it spins slowly, having a projected rotational velocity too low to be measured accurately.[9]

  1. ^ a b c d e 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. ^ a b Cite error: The named reference Evans1959 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference Johnson1966 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference Gontcharov2006 was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  8. ^ a b c d e f g h i Cite error: The named reference Ottoni2022 was invoked but never defined (see the help page).
  9. ^ a b Cite error: The named reference De Medeiros2014 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 Eggleton2008 was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference Gontcharov2017 was invoked but never defined (see the help page).

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