111 Herculis
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111 Herculis is a suspected astrometric binary[1] 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 Template:Convert 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.[4] The interferometry-measured angular diameter of the primary component is Template:Val,[5] which, at its estimated distance, equates to a physical radius of roughly 1.6 times the radius of the Sun.[6] The star is estimated to be 559[7] million years old with 2.40[7] times the mass of the Sun and is spinning with a projected rotational velocity of 71 km/s.[7] It is radiating 13 times the Sun's luminosity from its photosphere at an effective temperature of 8,873 K.[7]
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