1 Lacertae

1 Lacertae is a solitary[9] star in the northern constellation of Lacerta. It is visible to the naked eye with an apparent visual magnitude of 4.15. Based upon measurements by the Hipparcos spacecraft, this star is located at a distance of roughly 680 light years. It is moving closer to the Earth with a heliocentric radial velocity of −8.6 km/s.

1 Lacertae
Location of 1 Lacertae (circled)
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Lacerta
Right ascension 22h 15m 58.17690s[1]
Declination +37° 44′ 55.4468″[1]
Apparent magnitude (V) 4.15[2]
Characteristics
Spectral type K3 II-III[3]
U−B color index +1.70[2]
B−V color index +1.43[2]
Astrometry
Radial velocity (Rv)−8.58[4] km/s
Proper motion (μ) RA: +8.851[1] mas/yr
Dec.: –0.089[1] mas/yr
Parallax (π)4.8108 ± 0.1322 mas[1]
Distance680 ± 20 ly
(208 ± 6 pc)
Absolute magnitude (MV)−2.61+0.27
−0.24[5]
Details[6]
Mass4.16±0.28 M☉
Radius69.01+3.32
−3.07 R☉
Luminosity1,453±147 L☉
Surface gravity (log g)2.15 cgs
Temperature4,288±62 K
Metallicity [Fe/H]−0.01 dex
Rotational velocity (v sin i)10[7] km/s
Age170±30 Myr
Other designations
1 Lac, NSV 25864, BD+37°4526, HD 211388, HIP 109937, HR 8498, SAO 72191[8]
Database references
SIMBADdata
1 Lacertae in optical light

A stellar classification of K3 II-III[3] suggests this is an evolved giant star/bright giant hybrid. It is 170 million years old with around four times the mass of the Sun and has expanded to an estimated 69 times the Sun's radius. The star is radiating 1,453 times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,288 K, giving it the orange-hued glow of a K-type star.[10] The star was once a suspected variable, but this was later rescinded.[11]

References
  1. Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
  2. Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV Data, SIMBAD, Bibcode:1986EgUBV........0M.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. 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.{{citation}}: CS1 maint: multiple names: authors list (link)
  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, S2CID 17804304.
  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, S2CID 2756572.
  6. Baines, E.; Schmitt, H. R.; Zavala, R. T.; Hutter, D.; van Belle, G. T. (2017), "Fundamental Parameters of 87 Stars from the Navy Precision Optical Interferometer", The Astronomical Journal, 155 (1): 30, arXiv:1712.08109, Bibcode:2018AJ....155...30B, doi:10.3847/1538-3881/aa9d8b, S2CID 119427037
  7. Bernacca, P. L.; Perinotto, M. (1970). "A catalogue of stellar rotational velocities". Contributi Osservatorio Astronomico di Padova in Asiago. 239: 1. Bibcode:1970CoAsi.239....1B.
  8. "1 Lac -- Variable Star", SIMBAD Astronomical Database, Centre de Données astronomiques de Strasbourg, retrieved 2016-03-07.
  9. 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, S2CID 14878976.
  10. "The Colour of Stars", Australia Telescope, Outreach and Education, Commonwealth Scientific and Industrial Research Organisation, December 21, 2004, archived from the original on March 18, 2012, retrieved 2012-01-16.
  11. Samus, N. N.; et al. (2017), "General Catalogue of Variable Stars", Astronomy Reports, 5.1, 61 (1): 80–88, Bibcode:2017ARep...61...80S, doi:10.1134/S1063772917010085, S2CID 125853869, retrieved 2019-01-27.
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