HD 117566

HD 117566
Location of HD 117566 on the map (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Camelopardalis
Right ascension 13h 26m 56.80348s[1]
Declination +78° 38′ 37.9324″[1]
Apparent magnitude (V) 5.74±0.01[2]
Characteristics
Evolutionary stage Hertzsprung gap[3] or horizontal branch[4]
Spectral type G3 IIIb Fe−1 CH1[5]
U−B color index +0.35[6]
B−V color index +0.77[6]
Astrometry
Radial velocity (Rv)13.7±0.3[7] km/s
Proper motion (μ) RA: −140.497 mas/yr[1]
Dec.: +30.403 mas/yr[1]
Parallax (π)11.1974 ± 0.0417 mas[1]
Distance291 ± 1 ly
(89.3 ± 0.3 pc)
Absolute magnitude (MV)+1.03[8]
Details
Mass2.29[9] M☉
Radius7.2±0.4[10] R☉
Luminosity38.2±0.3[1] L☉
Surface gravity (log g)3.69±0.18[11] cgs
Temperature5,420±26[12] K
Metallicity [Fe/H]+0.03[11] dex
Rotational velocity (v sin i)8.9±1[13] km/s
Age760±50[7] Myr
Other designations
AG+78°340, BD+79°422, FK5 3075, GC 18223, HD 117566, HIP 65595, HR 5091, SAO 7821[14]
Database references
SIMBADdata

HD 117566, also known as HR 5091, is a solitary yellow-hued star[15] located in the northern circumpolar constellation Camelopardalis. It has an apparent magnitude of 5.74,[2] making it faintly visible to the naked eye. This object is relatively close at a distance of 291 light years based on Gaia DR3 parallax measurements but is receding with a heliocentric radial velocity of 14 km/s.[7] At its current distance, HD 117566's brightness is diminished by 0.12 magnitudes due to interstellar dust.[16]

HD 117566 has a stellar classification of G3 IIIb Fe−1 CH1,[5] indicating that it is a G-type giant with an under-abundance of iron and an overabundance of the CH radical in its spectrum. Its evolutionary stage is unclear. A 1994 paper places it in the Hertzsprung gap,[3] indicating it has ceased hydrogen core fusion and is now evolving toward the red giant branch (RGB). However, Mishenina et al. (2006) said that HD 117566 is already past the RGB and is on the horizontal branch, fusing helium at its core.[4] Nevertheless, it has 2.29 times the mass of the Sun[9] and, at the age of 760 million years,[7] it has expanded to 7.2 times the Sun's radius.[10] It radiates 38.2 times the luminosity of the Sun[1] from its photosphere at an effective temperature of 5,420 K.[12] HD 117566 has a solar metallicity[11] and spins modestly with a projected rotational velocity of 9 km/s.[13]

  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 Wallerstein1994 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Mishenina2006 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Keenan1989 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference Mermilliod1986 was invoked but never defined (see the help page).
  7. ^ a b c d Cite error: The named reference Soubrian2008 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  9. ^ a b Cite error: The named reference Liu2014 was invoked but never defined (see the help page).
  10. ^ a b Cite error: The named reference Kervella2004 was invoked but never defined (see the help page).
  11. ^ a b c Cite error: The named reference daSilva2015 was invoked but never defined (see the help page).
  12. ^ a b Cite error: The named reference Strassmeier2000 was invoked but never defined (see the help page).
  13. ^ a b Cite error: The named reference DeMed2014 was invoked but never defined (see the help page).
  14. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  15. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  16. ^ Cite error: The named reference Gontcharov2017 was invoked but never defined (see the help page).