Lambda2 Sculptoris

Lambda2 Sculptoris is an orange-hued star in the southern constellation of Sculptor. On dark nights it is faintly visible to the naked eye, having an apparent visual magnitude of +5.90.[2] Based upon an annual parallax shift of 9.63 mas as measured from Earth,[1] it is located roughly 340 light years from the Sun. It has a relatively large proper motion, advancing 0.284±0.015 arc seconds per year across the sky.[8]

For other star systems with this Bayer designation, see λ Sculptoris.
Lambda2 Sculptoris
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Sculptor
Right ascension  00h 44m 12.09871s[1]
Declination −38° 25′ 18.0704″[1]
Apparent magnitude (V) +5.90[2]
Characteristics
Spectral type K1 III[3]
B−V color index +1.15[2]
Astrometry
Radial velocity (Rv)+26.5[4] km/s
Proper motion (μ) RA: +246.29[1] mas/yr
Dec.: +120.53[1] mas/yr
Parallax (π)9.63 ± 0.40[1] mas
Distance340 ± 10 ly
(104 ± 4 pc)
Absolute magnitude (MV)+0.82[5]
Details
Mass1.49[4] M☉
Radius14[6] R☉
Luminosity63[4] L☉
Temperature4,531±25[4] K
Metallicity [Fe/H]−0.04±0.05[5] dex
Age3.58[4] Gyr
Other designations
λ2 Scl, CD−39° 181, FK5 26, HD 4211, HIP 3456, HR 195, SAO 192703[7]
Database references
SIMBADdata

At an age of about 3.58[4] billion years, Lambda2 Sculptoris is an evolved red clump[9] giant star with a stellar classification of K0 III.[3] It is presently on the horizontal branch and is generating energy through the nuclear fusion of helium at its core. The star has an estimated 1.49[4] times the mass of the Sun and has expanded to about 14[6] times the Sun's radius. It is radiating 63[4] times the solar luminosity from its photosphere at an effective temperature of 4,531 K.[4]

References
  1. 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. Evans, D. S. (1966), "Fundamental data for Southern stars (6th list).", Royal Observatory Bulletin, 110, Bibcode:1966RGOB..110..185E.
  3. Houk, Nancy (1979), Michigan catalogue of two-dimensional spectral types for the HD stars, 3, Ann Arbor, Michigan: Dept. of Astronomy, University of Michigan, Bibcode:1982mcts.book.....H.
  4. Luck, R. Earle (2015), "Abundances in the Local Region. I. G and K Giants", Astronomical Journal, 150 (3), 88, arXiv:1507.01466, Bibcode:2015AJ....150...88L, doi:10.1088/0004-6256/150/3/88.
  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. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy and Astrophysics (3rd ed.), 367: 521–24, arXiv:astro-ph/0012289, Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451.
  7. "lam02 Scl". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-06-01.
  8. Wroblewski, H.; Costa, E. (February 2001), "High proper motion stars with declinations between -30° and -40°, and right ascensions between 00 h and 10 h 40 m" (PDF), Astronomy and Astrophysics, 367: 725–728, Bibcode:2001A&A...367..725W, doi:10.1051/0004-6361:20000062.
  9. Liu, Y. J.; et al. (2007), "The abundances of nearby red clump giants", Monthly Notices of the Royal Astronomical Society, 382 (2): 553–66, Bibcode:2007MNRAS.382..553L, doi:10.1111/j.1365-2966.2007.11852.x.
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