Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Hercules |
Right ascension | 18h 47m 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 | |
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]
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Hercules |
Right ascension | 18h 47m 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 | |
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]