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1 Lacertae

1 Lacertae

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1 Lacertae
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Lacerta
Right ascension 22h 15m 58.17673s[1]
Declination +37° 44′ 55.4385″[1]
Apparent magnitude (V) 4.15[2]
Spectral type K3II-III[3]
U−B color index +1.70[2]
B−V color index +1.43[2]
Radial velocity (Rv)−8.58[4] km/s
Proper motion (μ) RA: +8.85[1] mas/yr
Dec.: –0.72[1] mas/yr
Parallax (π)5.25 ± 0.23[1] mas
Distance620 ± 30 ly
(190 ± 8 pc)
Absolute magnitude (MV)−2.61+0.27
Radius51[6] R
Surface gravity (log g)1.75[7] cgs
Temperature4,350[7] K
Metallicity [Fe/H]−0.12[7] dex
Rotational velocity (v sin i)10[8] km/s
Other designations
1 Lac, BD+37° 4526, HD 211388, HIP 109937, HR 8498, SAO 72191.[9]
Database references

1 Lacertae (1 Lac) is a solitary[10] star in the northern constellation of Lacerta. It is visible to the naked eye with an apparent magnitude of 4.15.[2] Based upon measurements by the Hipparcos spacecraft, this star is located at a distance of roughly 420 light years.[1] A stellar classification of K3II-III[3] suggests this is an evolved giant star. It has expanded to an estimated 51[6] times the radius of the Sun. The effective temperature of 4,350[7] K for the stellar atmosphere gives it the orange-hued glow of a K-type star.[11]


  1. ^ a b c d e f 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 ^ a b c d Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV data, SIMBAD, Bibcode:1986EgUBV........0M. 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 Herbig, George H.; Spalding, John F., Jr. (January 1955), "Axial Rotation and Line Broadening in Stars of Spectral Types F0-K5", Astrophysical Journal, 121: 118, Bibcode:1955ApJ...121..118H, doi:10.1086/145969. 
  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/0409579, Bibcode:2005A&A...430..165F, doi:10.1051/0004-6361:20041272. 
  5. ^ 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:0711.4984, Bibcode:2008AJ....135..892C, doi:10.1088/0004-6256/135/3/892. 
  6. ^ a b Pasinetti-Fracassini, L. E.; et al. (February 2001), "Catalogue of Stellar Diameters (CADARS)", Astronomy and Astrophysics, 367 (2): 521–524, arXiv:astro-ph/0012289, Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451. 
  7. ^ a b c d McWilliam, Andrew (December 1990), "High-resolution spectroscopic survey of 671 GK giants. I - Stellar atmosphere parameters and abundances", Astrophysical Journal Supplement Series, 74: 1075–1128, Bibcode:1990ApJS...74.1075M, doi:10.1086/191527. 
  8. ^ Bernacca, P. L.; Perinotto, M. (1970). "A catalogue of stellar rotational velocities". Contributi Osservatorio Astronomico di Padova in Asiago. 239. Bibcode:1970CoAsi.239....1B. 
  9. ^ "1 Lac -- Variable Star", SIMBAD Astronomical Database, Centre de Données astronomiques de Strasbourg, retrieved 2016-03-07. 
  10. ^ Eggleton, P. P.; Tokovinin, A. A. (2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x. 
  11. ^ "The Colour of Stars", Australia Telescope, Outreach and Education, Commonwealth Scientific and Industrial Research Organisation, December 21, 2004, archived from the original on March 10, 2012, retrieved 2012-01-16. 

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