Kappa Crateris

Kappa Crateris (κ Crateris) is the Bayer designation for a star in the southern constellation of Crater. It has an apparent visual magnitude of 5.94,[2] which, according to the Bortle scale, can be seen with the naked eye under dark suburban skies. The distance to this star, as determined from an annual parallax shift of 14.27 mas,[1] is around 229 light years.

κ Crateris
Location of κ Crateris (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Crater
Right ascension 11h 27m 09.51622s[1]
Declination −12° 21′ 24.2934″[1]
Apparent magnitude (V) 5.94[2]
Characteristics
Spectral type F5/6 III[3]
B−V color index +0.49[2]
Astrometry
Radial velocity (Rv)4.8±0.9[4] km/s
Proper motion (μ) RA: −98.96[1] mas/yr
Dec.: +24.25[1] mas/yr
Parallax (π)14.27 ± 0.41[1] mas
Distance229 ± 7 ly
(70 ± 2 pc)
Absolute magnitude (MV)+3.08[5]
Details
Mass1.74+0.10
−0.02[6] M☉
Luminosity17[7] L☉
Surface gravity (log g)3.69±0.02[6] cgs
Temperature6,545±63[6] K
Metallicity [Fe/H]+0.15±0.05[6] dex
Rotational velocity (v sin i)38.8[8] km/s
Age1.74+0.25
−0.20[6] Gyr
Other designations
κ Crt, 16 Crateris, BD−11° 3098, FK5 2914, HD 99564, HIP 55874, HR 4416, SAO 156685.[9]
Database references
SIMBADdata

This is an evolved F-type giant star[8] with a stellar classification of F5/6 III,[3] where the F5/6 indicates the spectrum lies intermediate between types F5 and F6. It is an estimated 1.74[6] billion years old and is spinning with a projected rotational velocity of 39[8] km/s. Kappa Crateris has 1.74[6] times the mass of the Sun, and radiates 17[7] times the solar luminosity from its outer atmosphere at an effective temperature of 6,545 K.[6]

Kappa Crateris has a visual companion: a magnitude 13.0 star located at an angular separation of 24.6 arc seconds along a position angle of 343°, as of 2000.[10]

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. Johnson, H. L.; et al. (1966), "UBVRIJKL photometry of the bright stars", Communications of the Lunar and Planetary Laboratory, 4 (99), Bibcode:1966CoLPL...4...99J.
  3. Houk, N.; Swift, C. (1999), "Michigan catalogue of two-dimensional spectral types for the HD Stars", Michigan Spectral Survey, Ann Arbor, Michigan: Department of Astronomy, University of Michigan, 5, Bibcode:1999MSS...C05....0H.
  4. de Bruijne, J. H. J.; Eilers, A.-C. (October 2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project", Astronomy & Astrophysics, 546: 14, arXiv:1208.3048, Bibcode:2012A&A...546A..61D, doi:10.1051/0004-6361/201219219, A61.
  5. Lambert, David L.; Reddy, Bacham E. (April 2004), "Lithium abundances of the local thin disc stars", Monthly Notices of the Royal Astronomical Society, 349 (2): 757−767, arXiv:astro-ph/0401259, Bibcode:2004MNRAS.349..757L, doi:10.1111/j.1365-2966.2004.07557.x.
  6. Ramírez, I.; et al. (September 2012), "Lithium Abundances in nearby FGK Dwarf and Subgiant Stars: Internal Destruction, Galactic Chemical Evolution, and Exoplanets", The Astrophysical Journal, 756 (1): 46, arXiv:1207.0499, Bibcode:2012ApJ...756...46R, doi:10.1088/0004-637X/756/1/46.
  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. Schröder, C.; Reiners, A.; Schmitt, J. H. M. M. (January 2009), "Ca II HK emission in rapidly rotating stars. Evidence for an onset of the solar-type dynamo" (PDF), Astronomy and Astrophysics, 493 (3): 1099–1107, Bibcode:2009A&A...493.1099S, doi:10.1051/0004-6361:200810377.
  9. "kap Crt -- Star", SIMBAD Astronomical Database, Centre de Données astronomiques de Strasbourg, retrieved 2017-02-26.
  10. Mason, B. D.; et al. (2014), "The Washington Visual Double Star Catalog", The Astronomical Journal, 122: 3466–3471, Bibcode:2001AJ....122.3466M, doi:10.1086/323920.
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