HR 6594

HR 6594
Observation data
Epoch J2000      Equinox J2000
Constellation Hercules
Right ascension 17h 41m 58.632s[1]
Declination +15° 57′ 08.76″[1]
Apparent magnitude (V) 5.54[2]
Characteristics
Evolutionary stage Main sequence[3]
Spectral type F4 Vw[4]
U−B color index −0.05[5]
B−V color index +0.387±0.012[2]
Astrometry
Radial velocity (Rv)−43.7[6] km/s
Proper motion (μ) RA: −1.868 mas/yr[1]
Dec.: +101.120 mas/yr[1]
Parallax (π)28.5131 ± 0.0532 mas[1]
Distance114.4 ± 0.2 ly
(35.07 ± 0.07 pc)
Absolute magnitude (MV)2.74[7]
Details
HR 6594 A
Mass1.34[8] M☉
Radius0.97[9] R☉
Luminosity6.17[2] L☉
Surface gravity (log g)4.07[3] cgs
Temperature6,615[3] K
Metallicity [Fe/H]−0.04[10] dex
Rotational velocity (v sin i)31.7[3] km/s
Age1.2[8] Gyr
Other designations
BD−16° 3256, HD 160910, HIP 86623, HR 6594, SAO 103033[11]
Database references
SIMBADdata

HR 6594 is the Bright Star Catalogue designation for a binary star[12] system in the northern constellation of Hercules. It is faintly visible to the naked eye with an apparent visual magnitude of 5.54;[2] according to the Bortle scale, it is sufficiently bright to be visible from dark suburban skies. The distance to this system, as determined using parallax measurements,[1] is about 114 light years. It is drifting closer with a heliocentric radial velocity of −43.7 km/s,[6] and is predicted to come as near as 47 light-years in 686,000 years.[2] On the celestial sphere it is located near the star Alpha Ophiuchi; their projected separation is just 3 light years, although their actual separation is much greater.[13]

The primary is an F-type main sequence star with a stellar classification of F4 Vw, where the w indicates relatively weak metallic features in the ultraviolet spectrum.[4] This star has 134% of the Sun's mass,[8] but only 97% of the solar radius.[9] It is spinning with a projected rotational velocity of 31.7 km/s,[3] and is around 1.2 billion years old.[8] The effective temperature of the outer atmosphere is 6,615 K,[3] giving it the yellow-white hue of an F-type star.[14] The abundance of elements other than hydrogen or helium, what astronomers term the metallicity, is similar to that in the Sun.[10]

It has a magnitude 9.38 companion star orbiting with a 144-year period, a semimajor axis spanning 1.04 arcseconds, and an eccentricity of 0.42.[12] There is a third, visual companion of magnitude 14.46 at an angular separation of 154.70 arcseconds along a position angle of 271°, as of 2001.[15]

  1. ^ a b c d e Cite error: The named reference GaiaEDR3 was invoked but never defined (see the help page).
  2. ^ a b c d e Cite error: The named reference Anderson_Francis_2012 was invoked but never defined (see the help page).
  3. ^ a b c d e f Cite error: The named reference Schröder2009 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference barry1970 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference Mermilliod1986 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference Wilson1953 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference Boesgaard1986 was invoked but never defined (see the help page).
  8. ^ a b c d Cite error: The named reference David2015 was invoked but never defined (see the help page).
  9. ^ a b Cite error: The named reference CADARS was invoked but never defined (see the help page).
  10. ^ a b Cite error: The named reference aa530_A138 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. ^ a b Cite error: The named reference Malkov2012 was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference Redfield2007 was invoked but never defined (see the help page).
  14. ^ Cite error: The named reference csiro was invoked but never defined (see the help page).
  15. ^ Cite error: The named reference WDSC2014 was invoked but never defined (see the help page).