HD 154345

HD 154345
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Hercules
Right ascension 17h 02m 36.40381s[1]
Declination +47° 04′ 54.7642″[1]
Apparent magnitude (V) +6.76[2]
Characteristics
Spectral type G8V[3]
U−B color index 0.27
B−V color index 0.728±0.005[2]
Astrometry
Radial velocity (Rv)−47.08±0.12[1] km/s
Proper motion (μ) RA: 123.274 mas/yr[1]
Dec.: 853.639 mas/yr[1]
Parallax (π)54.7359 ± 0.0176 mas[1]
Distance59.59 ± 0.02 ly
(18.270 ± 0.006 pc)
Absolute magnitude (MV)+5.41[2]
Details[4]
Mass0.90±0.01 M☉
Radius0.85±0.01 R☉
Luminosity0.620±0.002 L☉
Surface gravity (log g)4.53±0.01 cgs
Temperature5,557±15 K
Metallicity [Fe/H]−0.14±0.04[5] dex
Rotation27.8±1.7 d[6]
Age4.10±1.20 Gyr
Other designations
BD+47°2420, GC 23011, GJ 651, HD 154345, HIP 83389, SAO 46452, GCRV 9834[7]
Database references
SIMBADdata

HD 154345 is a star in the northern constellation of Hercules. With an apparent visual magnitude of +6.76[2] it is a challenge to view with the naked eye, but using binoculars it is an easy target.[8] The distance to this star is 59.6 light years based on parallax, but it is drifting closer with a radial velocity of −47 km/s.[1] At least one exoplanet is orbiting this star.[9]

The stellar classification of HD 154345 is G8V,[3] matching an ordinary G-type main-sequence star that is generating energy by core hydrogen fusion. The magnetic activity cycle of this star is curiously correlated with the radial velocity variations induced by its putative planetary companion.[10][11] It is around four[4] billion years old and is spinning with a rotation period of 28 days.[6] The star is smaller and less massive than the Sun. It is radiating 62% of the luminosity of the Sun from its photosphere at an effective temperature of 5,557 K.[4]

  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 c d Cite error: The named reference Anderson_Francis_2012 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Cowley_et_al_1967 was invoked but never defined (see the help page).
  4. ^ a b c Cite error: The named reference Bonfanti_et_al_2016 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference Aguilera-Gómez_et_al_2018 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference Simpson_et_al_2010 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference ICQ was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Wright_et_al_2007 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Wright2015 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference Wright_Miller_2015 was invoked but never defined (see the help page).