111 Herculis

111 Herculis
Observation data
Epoch J2000      Equinox J2000
Constellation Hercules
Right ascension 18h 47m 01.23246s[1]
Declination +21° 46′ 53.4381″[1]
Apparent magnitude (V) 4.34[2]
Characteristics
Spectral type A5III[3]
B−V color index 0.148±0.003[2]
Astrometry
Radial velocity (Rv)−44.6±2.7[2] km/s
Proper motion (μ) RA: +100.536[1] mas/yr
Dec.: +116.333[1] mas/yr
Parallax (π)35.3525 ± 0.2680 mas[1]
Distance92.3 ± 0.7 ly
(28.3 ± 0.2 pc)
Absolute magnitude (MV)2.04[2]
Details
Mass2.40[4] M☉
Radius1.6[5] R☉
Luminosity12.84[2] L☉
Surface gravity (log g)4.35[4] cgs
Temperature8,873±302[4] K
Metallicity [Fe/H]0.33[6] dex
Rotational velocity (v sin i)71[4] km/s
Age559[4] Myr
Other designations
111 Her, BD+18°3823, FK5 1491, HD 173880, HIP 92161, HR 7069, SAO 104093, WDS J18470+1811[7]
Database references
SIMBADdata

111 Herculis is a suspected astrometric binary[8] star system located 92 light years from the Sun in the northern constellation Hercules. It is visible to the naked eye as a faint, white-hued point of light with an apparent visual magnitude of 4.34.[2] The system is moving nearer to the Earth with a heliocentric radial velocity of −45 km/s, and may come as close as 37 light-years in 537,000 years.[2]

According to Cowley et al. (1969), the visible component has a stellar classification of A5III,[3] matching an A-type giant star. Abt and Morrell (1995) listed it as type A3IV, suggesting it is instead a less evolved subgiant star.[9] The interferometry-measured angular diameter of the primary component is 0.52±0.02 mas,[10] which, at its estimated distance, equates to a physical radius of roughly 1.6 times the radius of the Sun.[5] The star is estimated to be 559[4] million years old with 2.40[4] times the mass of the Sun and is spinning with a projected rotational velocity of 71 km/s.[4] It is radiating 13 times the Sun's luminosity from its photosphere at an effective temperature of 8,873 K.[4]

  1. ^ a b c d e Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  2. ^ a b c d e f g Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Cowley1969 was invoked but never defined (see the help page).
  4. ^ a b c d e f g h i Cite error: The named reference David2015 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference lang2006 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference Erspamer2003 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 Eggleton2008 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference abt1995 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Richichi2005 was invoked but never defined (see the help page).