Lambda Lyrae

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Lambda Lyrae
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Lyra
Right ascension 19h 00m 00.82568s[1]
Declination +32° 8′ 43.8527″[1]
Apparent magnitude (V) 4.937[2]
Spectral type K2.5 II[3]
U−B color index +1.609[2]
B−V color index +1.455[2]
Radial velocity (Rv)-17.69 ± 0.02[4] km/s
Proper motion (μ) RA: 6.08[1] mas/yr
Dec.: 9.96[1] mas/yr
Parallax (π)2.95 ± 0.25[1] mas
Distance1,110 ± 90 ly
(340 ± 30 pc)
Absolute magnitude (MV)−3.75+0.65
Mass6.3 ± 0.8[5] M
Radius120[6] R
Luminosity2,228[7] L
Surface gravity (log g)2.21[3] cgs
Temperature4,220[3] K
Metallicity [Fe/H]−0.02[3] dex
Rotational velocity (v sin i)3.2±1.0[3] km/s
Age58.4 ± 22.6[5] Myr
Other designations
λ Lyrae, 15 Lyrae, BD+31 3424, GSC 02643-03347, HD 176670, HIP 93279, HR 7192, SAO 67682.[8]
Database references

Lambda Lyrae (λ Lyr) is a 5th magnitude star in the constellation Lyra, approximately 1,100 light years away from Earth. It is an orange bright giant star of the spectral type K2.5II. It is much brighter and larger, yet cooler, than the Sun.[8] The star is about 6.3 solar masses in mass and has a diameter more than 100 times larger than the Sun's.


  1. ^ a b c d e 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 c Jennens, P. A.; Helfer, H. L. (September 1975), "A new photometric metal abundance and luminosity calibration for field G and K giants", Monthly Notices of the Royal Astronomical Society, 172: 667–679, Bibcode:1975MNRAS.172..667J, doi:10.1093/mnras/172.3.667. 
  3. ^ a b c d e f Carney, Bruce W.; et al. (March 2008), "Rotation and Macroturbulence in Metal-Poor Field Red Giant and Red Horizontal Branch Stars", The Astronomical Journal, 135 (3): 892–906, arXiv:0711.4984Freely accessible, Bibcode:2008AJ....135..892C, doi:10.1088/0004-6256/135/3/892. 
  4. ^ Famaey, B.; et al. (2005), "Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data. Revisiting the concept of superclusters", Astronomy and Astrophysics, 430: 165–186, arXiv:astro-ph/0409579Freely accessible, Bibcode:2005A&A...430..165F, doi:10.1051/0004-6361:20041272. 
  5. ^ a b Tetzlaff, N.; Neuhäuser, R.; Hohle, M. M. (2011), "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun", Monthly Notices of the Royal Astronomical Society, 410: 190, arXiv:1007.4883Freely accessible, Bibcode:2011MNRAS.410..190T, doi:10.1111/j.1365-2966.2010.17434.x. 
  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/0012289Freely accessible, Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451. 
  7. ^ McDonald, I.; Zijlstra, A. A; Boyer, M. L. (2012). "Fundamental Parameters and Infrared Excesses of Hipparcos Stars". Monthly Notices of the Royal Astronomical Society. 427 (1): 343–57. arXiv:1208.2037Freely accessible. Bibcode:2012MNRAS.427..343M. doi:10.1111/j.1365-2966.2012.21873.x. 
  8. ^ a b "Simbad Query Result". Simbad. Retrieved October 15, 2007.