106 Herculis

106 Herculis
Observation data
Epoch J2000      Equinox J2000
Constellation Hercules
Right ascension 18h 20m 17.91482s[1]
Declination +21° 57′ 40.6622″[1]
Apparent magnitude (V) 4.96[2]
Characteristics
Spectral type M0 III[3]
U−B color index +1.98[4]
B−V color index +1.58[4]
Variable type suspected SR[5][6]
Astrometry
Radial velocity (Rv)−35.20±0.29[7] km/s
Proper motion (μ) RA: +18.105[1] mas/yr
Dec.: -59.631[1] mas/yr
Parallax (π)8.5067 ± 0.1739 mas[1]
Distance383 ± 8 ly
(118 ± 2 pc)
Absolute magnitude (MV)−0.664[7]
Details
Radius44.32+2.70
−5.89[1] R☉
Luminosity414.1±9.7[1] L☉
Surface gravity (log g)1.56±0.09[3] cgs
Temperature3,789±6[3] K
Metallicity [Fe/H]0.00±0.03[3] dex
Rotational velocity (v sin i)5.0±1.0[8] km/s
Other designations
106 Her, NSV 24405, BD+21°3390, HD 168720, HIP 89861, HR 6868, SAO 85941[9]
Database references
SIMBADdata

106 Herculis is a variable star in the northern constellation Hercules. It is visible to the naked eye as a faint, red-hued point of light with a baseline apparent visual magnitude of 4.96.[2] Based on its parallax, it is estimated to lie 383 light-years (117 parsecs) away from the Sun.[3] The star is moving closer to the Earth with a heliocentric radial velocity of -35 km/s.[7]

Eggleton and Tokovinin (2008) listed this as a suspected binary star system consisting of two roughly equal components.[10] It appears as an ageing red giant with a stellar classification of M0III. This is a suspected semiregular variable star with a very small amplitude and a period of 40 days or more.[6] Having exhausted the supply of hydrogen at its core, it has expanded to 44[1] times the Sun's radius. It is radiating around 414[1] times the luminosity of the Sun from its enlarged photosphere at an effective temperature of about 3,789 K.[3]

  1. ^ a b c d e f g h i Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  2. ^ a b Cite error: The named reference Ducati2002 was invoked but never defined (see the help page).
  3. ^ a b c d e f Cite error: The named reference Wu2010 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference EgUBV was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference gcvs was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference percy was invoked but never defined (see the help page).
  7. ^ a b c Cite error: The named reference Soubiran2008 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference Zamanov2008 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).