104 Herculis

104 Herculis

A visual band light curve for V669 Herculis. The main plot shows the long-term variation (plotted from data published by Tabur et al.[1]) and the inset plot shows the short-term periodic variation (adapted from Adelman and William[2]).
Observation data
Epoch J2000      Equinox J2000
Constellation Hercules
Right ascension 18h 11m 54.15649s[3]
Declination +31° 24′ 19.2469″[3]
Apparent magnitude (V) 4.96[4]
Characteristics
Evolutionary stage AGB[5]
Spectral type M3 III[6]
B−V color index 1.643±0.004[4]
Variable type semiregular[7]
Astrometry
Radial velocity (Rv)−1.19±0.29[4] km/s
Proper motion (μ) RA: −15.172[3] mas/yr
Dec.: +25.084[3] mas/yr
Parallax (π)5.8167 ± 0.1769 mas[3]
Distance560 ± 20 ly
(172 ± 5 pc)
Absolute magnitude (MV)−1.15[4]
Details
Radius85.80+6.65
−10.88[3] R☉
Luminosity1,202.3±42.1[3] L☉
Surface gravity (log g)0.99±0.29[8] cgs
Temperature3,535±24[8] K
Metallicity [Fe/H]−0.08±0.10[8] dex
Other designations
A Her, 104 Her, V669 Her, BD+31°3199, FK5 3448, HD 167006, HIP 89172, HR 6815, SAO 66737[9][10]
Database references
SIMBADdata


104 Herculis is a solitary[11] variable star[2] located around 560[3] light years away from the Sun in the northern constellation of Hercules.[9] It has the variable star designation V669 Herculis and the Bayer designation A Herculis, while 104 Herculis is the Flamsteed designation. This object is visible to the naked eye as a dim, red-hued point of light with a baseline apparent visual magnitude of 4.96.[4] It is moving closer to the Earth with a heliocentric radial velocity of −1.2 km/s.[4]

This is an aging red giant star on the asymptotic giant branch[5] with a stellar classification of M3 III.[6] It is a semiregular variable[7] with an amplitude of 0.14 in the B-band[12] and pulsation periods of 22.9 and 24.0 days.[1] Having exhausted the hydrogen at its core, the star has expanded to 86[3] times the Sun's radius. It is radiating 1,202[3] times the Sun's luminosity from its swollen photosphere at an effective temperature of 3,535 K.[8]

  1. ^ a b Cite error: The named reference Tabur2009 was invoked but never defined (see the help page).
  2. ^ a b Cite error: The named reference Adelman2006 was invoked but never defined (see the help page).
  3. ^ a b c d e f g h i j Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  4. ^ a b c d e f Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Eggen1992 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference perkins1989 was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference glass2007 was invoked but never defined (see the help page).
  8. ^ a b c d Cite error: The named reference Prugniel2011 was invoked but never defined (see the help page).
  9. ^ a b Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference xref was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference Samus2017 was invoked but never defined (see the help page).