Nu Herculis

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Nu Herculis
Observation data
Epoch J2000      Equinox J2000
Constellation Hercules
Right ascension 17h 58m 30.14909s[1]
Declination +30° 11′ 21.3870″[1]
Apparent magnitude (V) +4.41[2]
Spectral type F2II[3]
U−B color index +0.13[4]
B−V color index +0.35[4]
Variable type SRd[5]
Radial velocity (Rv) -22.30 ± 0.6[6] km/s
Proper motion (μ) RA: -0.81[1] mas/yr
Dec.: 2.18[1] mas/yr
Parallax (π) 3.79 ± 0.39[1] mas
Distance approx. 860 ly
(approx. 260 pc)
Mass 5.31[7] M
Surface gravity (log g) 2.29[7] cgs
Temperature 6410[7] K
Metallicity [Fe/H] −0.33[8] dex
Rotational velocity (v sin i) 27[9] km/s
Other designations
BD+30° 3093, HD 164136, HIP 87998, HR 6707, SAO 66524[10]
Database references

Nu Herculis (ν Her) is a star in the constellation of Hercules. With an apparent magnitude of 4.41, it is faintly visible to the naked eye.[2] Parallax measurements made by the Hipparcos spacecraft put it at a distance of about 860 light years (260 parsecs).[1]

Nu Herculis's spectral type of F2II means that it is an F-type bright giant, with a luminosity many times that of the Sun.[10] Its effective temperature is 6410, hotter than the Sun.[7] Its mass is about 5.3 solar masses.[7] It is a semiregular variable star.[5]


  1. ^ a b c d e f van Leeuwen, F.; et al. (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. Bibcode:2002yCat.2237....0D. 
  3. ^ Morgan, W. W.; Roman, Nancy G. (1950). "Revised Standards for Supergiants on the System of the Yerkes Spectral Atlas". Astrophysical Journal. 112: 362–364. Bibcode:1950ApJ...112..362M. doi:10.1086/145351. 
  4. ^ a b Mermilliod, J.-C. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Bibcode:1986EgUBV........0M. 
  5. ^ a b Samus, N. N.; Durlevich, O. V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/gcvs. Originally published in: 2009yCat....102025S. 1. Bibcode:2009yCat....1.2025S. 
  6. ^ Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv:1606.08053Freely accessible. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. Retrieved 12 December 2016. 
  7. ^ a b c d e Lyubimkov, Leonid S.; Lambert, David L.; Kaminsky, Bogdan M.; Pavlenko, Yakov V.; Poklad, Dmitry B.; Rachkovskaya, Tamara M. (2012). "Lithium abundance in atmospheres of F- and G-type supergiants and bright giants". Monthly Notices of the Royal Astronomical Society. 427 (1): 11–26. arXiv:1212.6057Freely accessible. Bibcode:2012MNRAS.427...11L. doi:10.1111/j.1365-2966.2012.21617.x. 
  8. ^ Luck, R. Earle (2014). "Parameters and Abundances in Luminous Stars". The Astronomical Journal. 147 (6). Bibcode:2014AJ....147..137L. doi:10.1088/0004-6256/147/6/137. 
  9. ^ Uesugi, Akira; Fukuda, Ichiro (1970). "Catalogue of rotational velocities of the stars". Contributions from the Institute of Astrophysics and Kwasan Observatory. 
  10. ^ a b "nu. Her". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 5 March 2017.