| |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Hercules |
| Right ascension | 18h11m 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 | |
A Her, 104 Her, V669 Her, BD+31°3199, FK5 3448, HD 167006, HIP 89172, HR 6815, SAO 66737[9][10] | |
| 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 constellationofHercules.[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]
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