![]() 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]