93 Herculis

93 Herculis
Observation data
Epoch J2000      Equinox J2000
Constellation Hercules
Right ascension 18h 00m 03.41611s[1]
Declination +16° 45′ 03.2855″[1]
Apparent magnitude (V) 4.67[2]
Characteristics
Spectral type K0.5IIb[3]
B−V color index 1.254±0.007[2]
Astrometry
Radial velocity (Rv)−24.47±0.20[4] km/s
Proper motion (μ) RA: −6.878[1] mas/yr
Dec.: −9.696[1] mas/yr
Parallax (π)4.5894 ± 0.3311 mas[1]
Distance710 ± 50 ly
(220 ± 20 pc)
Absolute magnitude (MV)−1.85[2]
Details
Radius50.53+1.41
−1.39[1] R☉
Luminosity919±74[1] L☉
Surface gravity (log g)1.8[5] cgs
Temperature4,471+63
−61[1] K
Metallicity [Fe/H]−0.22[5] dex
Other designations
93 Her, BD+16° 3335, FK5 1469, HD 164349, HIP 88128, HR 6713, SAO 103285[6]
Database references
SIMBADdata

93 Herculis is a star located around 750[1] light years away from the Sun in the northern constellation of Hercules.[6] It is visible to the naked eye as a faint, orange-hued star with an apparent visual magnitude of 4.67[2] The brightness of the star is diminished by an extinction of 0.21 due to interstellar dust.[7] It is moving closer to the Earth with a heliocentric radial velocity of −24.5 km/s.[4] This star, together with 95 Her, 102 Her, and 109 Her, made up the obsolete constellation Cerberus.[8]

This object has a stellar classification of K0.5IIb,[3] which indicates it is an evolved bright giant. With the supply of hydrogen at its core exhausted, the star has expanded to 51[1] times the Sun's radius. It is radiating around 919[1] times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 4,471 K.[1] It is generally deficient in metal elements, but appears weakly enhanced in barium and other heavier elements.[5] This is a suspected barium star and hence may have a white dwarf companion in orbit.[9]

  1. ^ a b c d e f g h i j k l Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  2. ^ a b c d Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference perkins1989 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference deBruijne2012 was invoked but never defined (see the help page).
  5. ^ a b c Cite error: The named reference Smith1982 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference Famaey2005 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference ridpath was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).