Xi Herculis (ξ Her, 92 Her, HD 163993, SAO 85590, HR 6703) is a star located within the constellation of Hercules. Its declination is 29° 15′, its right ascension is 17h 58m, and its apparent magnitude is 3.7. Xi Herculis is about 160 light-years from Earth.
This star has 2.26 times the mass of the Sun, with a projected rotational velocity of 3.2 km s−1. it is radiating 62 times the luminosity of the Sun from the outer atmosphere at an effective temperature of 4,963 K.
In R.H.Allen's version, this star, together with ν Her and 99 Her (b Herculis) were represent states Zhongshan (or Chung Shan' "the Middle Mountain")., but in Chinese literature, it was only for ο Her.
- Pizzolato, N.; Maggio, A.; Sciortino, S. (September 2000), "Evolution of X-ray activity of 1-3 Msun late-type stars in early post-main-sequence phases", Astronomy and Astrophysics, 361: 614–628, Bibcode:2000A&A...361..614P
- Mallik, Sushma V. (December 1999), "Lithium abundance and mass", Astronomy and Astrophysics, 352: 495–507, Bibcode:1999A&A...352..495M
- Star Names - R.H.Allen p.246
- (Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 6 月 6 日
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