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] |
Distance | 560 ± 20 ly (172 ± 5 pc) |
Absolute magnitude (MV) | −1.15[4] |
Details | |
Radius | 85.80+6.65 −10.88[3] R☉ |
Luminosity | 1,202.3±42.1[3] L☉ |
Surface gravity (log g) | 0.99±0.29[8] cgs |
Temperature | 3,535±24[8] K |
Metallicity [Fe/H] | −0.08±0.10[8] dex |
Other designations | |
Database references | |
SIMBAD | data |
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]