| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Hercules |
| Right ascension | 18h47m 01.23246s[1] |
| Declination | +21° 46′ 53.4381″[1] |
| Apparent magnitude (V) | 4.34[2] |
| Characteristics | |
| Spectral type | A5III[3] |
| B−V color index | 0.148±0.003[2] |
| Astrometry | |
| Radial velocity (Rv) | −44.6±2.7[2] km/s |
| Proper motion (μ) | RA: +100.536[1] mas/yr Dec.: +116.333[1] mas/yr |
| Parallax (π) | 35.3525 ± 0.2680 mas[1] |
| Distance | 92.3 ± 0.7 ly (28.3 ± 0.2 pc) |
| Absolute magnitude (MV) | 2.04[2] |
| Details | |
| Mass | 2.40[4] M☉ |
| Radius | 1.6[5] R☉ |
| Luminosity | 12.84[2] L☉ |
| Surface gravity (log g) | 4.35[4] cgs |
| Temperature | 8,873±302[4] K |
| Metallicity [Fe/H] | 0.33[6] dex |
| Rotational velocity (v sin i) | 71[4] km/s |
| Age | 559[4] Myr |
| Other designations | |
111 Her, BD+18°3823, FK5 1491, HD 173880, HIP 92161, HR 7069, SAO 104093, WDS J18470+1811[7] | |
| Database references | |
| SIMBAD | data |
111 Herculis is a suspected astrometric binary[8] star system located 92 light years from the Sun in the northern constellation Hercules. It is visible to the naked eye as a faint, white-hued point of light with an apparent visual magnitude of 4.34.[2] The system is moving nearer to the Earth with a heliocentric radial velocity of −45 km/s, and may come as close as 37 light-years in 537,000 years.[2]
According to Cowley et al. (1969), the visible component has a stellar classification of A5III,[3] matching an A-type giant star. Abt and Morrell (1995) listed it as type A3IV, suggesting it is instead a less evolved subgiant star.[9] The interferometry-measured angular diameter of the primary component is 0.52±0.02 mas,[10] which, at its estimated distance, equates to a physical radius of roughly 1.6 times the radius of the Sun.[5] The star is estimated to be 559[4] million years old with 2.40[4] times the mass of the Sun and is spinning with a projected rotational velocity of 71 km/s.[4] It is radiating 13 times the Sun's luminosity from its photosphere at an effective temperature of 8,873 K.[4]
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