109 Herculis

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109 Herculis
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Hercules
Right ascension 18h 23m 41.89s[1]
Declination +21° 46′ 11.1″[1]
Apparent magnitude (V) 3.84[2]
Absolute magnitude (V)+0.87[3]
Spectral typeK2 III[4]
Other designations
BD+21° 3411, FK5 690, HD 169414, HIP 90139, HR 6895, SAO 86003

109 Herculis is a star in the constellation Hercules. Its apparent magnitude is 3.84.[2] Located around 36.47 parsecs (118.9 ly) distant,[1] it is an orange giant of spectral type K2III,[4] a star that has used up its core hydrogen and has expanded.


  1. ^ a b c van Leeuwen, F. (November 2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752Freely accessible. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. 
  2. ^ a b Ducati, J. R. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". CDS/ADC Collection of Electronic Catalogues. 2237: 0. Bibcode:2002yCat.2237....0D. 
  3. ^ Cardini, D. (January 2005), "Mg II chromospheric radiative loss rates in cool active and quiet stars", Astronomy and Astrophysics, 430: 303–311, arXiv:astro-ph/0409683Freely accessible, Bibcode:2005A&A...430..303C, doi:10.1051/0004-6361:20041440. 
  4. ^ a b "109 Herculis". SIMBAD Astronomical Database. Centre de Données astronomiques de Strasbourg. Retrieved 25 July 2015.