Kappa Lyrae

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κ Lyrae
Lyra constellation map.svg
Red circle.svg
Location of κ Lyrae (circled)
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Lyra
Right ascension 18h 19m 51.70908s[1]
Declination +36° 03′ 52.3691″[1]
Apparent magnitude (V) 4.35[2]
Spectral type K2 III[3]
U−B color index +1.17[2]
B−V color index +1.14[2]
Radial velocity (Rv)-24.36[4] km/s
Proper motion (μ) RA: -16.75[1] mas/yr
Dec.: +41.09[1] mas/yr
Parallax (π)13.71 ± 0.56[1] mas
Distance238 ± 10 ly
(73 ± 3 pc)
Absolute magnitude (MV)−0.11[5]
Radius16[6] R
Luminosity127.4[7] L
Surface gravity (log g)2.51[8] cgs
Temperature4,638[8] K
Metallicity [Fe/H]+0.13[8] dex
Rotational velocity (v sin i)5.0[4] km/s
Other designations
κ Lyrae, 1 Lyrae, BD+36°3094, HD 168775, HIP 89826, HR 6872, SAO 66869.[9]
Database references

Kappa Lyrae, Latinized from κ Lyrae, is a solitary 4th magnitude star approximately 238 light years away from Earth, in the northern constellation of Lyra. It is a giant star of the spectral type K2III[3] with an effective temperature of 4,638[8] kelvins. It is cooler, yet larger and brighter, than the Sun. It is also a suspected small amplitude variable star.[10]


  1. ^ a b c d e van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357.
  2. ^ a b c Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV data. SIMBAD, Bibcode:1986EgUBV........0M.
  3. ^ a b Cenarro, A. J.; et al. (July 2009), "Mg and TiO spectral features at the near-IR: spectrophotometric index definitions and empirical calibrations", Monthly Notices of the Royal Astronomical Society, 396 (4): 1895–1914, arXiv:0903.4835, Bibcode:2009MNRAS.396.1895C, doi:10.1111/j.1365-2966.2009.14839.x.
  4. ^ a b Massarotti, Alessandro; et al. (January 2008), "Rotational and radial velocities for a sample of 761 HIPPARCOS giants and the role of binarity", The Astronomical Journal, 135 (1): 209–231, Bibcode:2008AJ....135..209M, doi:10.1088/0004-6256/135/1/209.
  5. ^ Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015.
  6. ^ Pasinetti Fracassini, L. E.; et al. (2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS) - Third edition - Comments and statistics", Astronomy & Astrophysics, 367: 521–24, arXiv:astro-ph/0012289, Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451.
  7. ^ McDonald, I.; et al. (2012), "Fundamental Parameters and Infrared Excesses of Hipparcos Stars", Monthly Notices of the Royal Astronomical Society, 427 (1): 343–57, arXiv:1208.2037, Bibcode:2012MNRAS.427..343M, doi:10.1111/j.1365-2966.2012.21873.x.
  8. ^ a b c d Maldonado, J.; et al. (June 2013), "The metallicity signature of evolved stars with planets", Astronomy & Astrophysics, 554: 18, arXiv:1303.3418, Bibcode:2013A&A...554A..84M, doi:10.1051/0004-6361/201321082, A84.
  9. ^ "* kap Lyr". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved October 14, 2007.
  10. ^ Percy, J. R.; et al. (1994), "Photometric surveys of suspected small-amplitude red variables. III: An AAVSO photometric photometry survey", Astronomical Society of the Pacific, 106 (700): 611–615, Bibcode:1994PASP..106..611P, doi:10.1086/133420.