Kappa Gruis

κ Gruis, Latinised as Kappa Gruis, is a solitary[7] star in the southern constellation of Grus. With an apparent magnitude of 5.37,[2] it is visible to the naked eye as a dim, orange-hued point. The distance to this system, as determined from an annual parallax shift of 8.87 mas as seen from the Earth,[1] is roughly 368 light years. It is drifting further away with a heliocentric radial velocity of +18 km/s.[5] It is a member of the Arcturus moving group.[3]

Kappa Gruis
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Grus
Right ascension  23h 04m 39.62786s[1]
Declination −53° 57′ 53.6651″[1]
Apparent magnitude (V) 5.37[2]
Characteristics
Evolutionary stage asymptotic giant branch[3]
Spectral type K5 III[4]
B−V color index +1.45[2]
Astrometry
Radial velocity (Rv)+17.7±0.8[5] km/s
Proper motion (μ) RA: +57.047[1] mas/yr
Dec.: −104.882[1] mas/yr
Parallax (π)8.8748 ± 0.1536[1] mas
Distance368 ± 6 ly
(113 ± 2 pc)
Absolute magnitude (MV)−1.04[3]
Details
Radius29.59+0.60
−2.02[1] R☉
Luminosity199.9±4.0[1] L☉
Temperature3,990+143
−40[1] K
Other designations
κ Gru, CPD−54° 10197, FK5 3845, HD 217902, HIP 113957, HR 8774, SAO 247711[6]
Database references
SIMBADdata

This is an evolved K-type giant star on the asymptotic giant branch[3] with a stellar classification of K5 III.[4] With the supply of hydrogen at its core exhausted, it has expanded and now spans 29.6[1] times the radius of the Sun. It is radiating 200[1] times the Sun's luminosity from its enlarged photosphere at an effective temperature of 3,990 K.[1]

References
  1. Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  2. Corben, P. M.; Stoy, R. H. (1968), "Photoelectric Magnitudes and Colours for Bright Southern Stars", Monthly Notes of the Astronomical Society of Southern Africa, 27: 11, Bibcode:1968MNSSA..27...11C.
  3. Eggen, Olin J.; Iben, Icko, Jr. (April 1991), "First giant branch and asymptotic giant branch stars in nearby aggregates", Astronomical Journal, 101: 1377–1407, Bibcode:1991AJ....101.1377E, doi:10.1086/115773.
  4. Houk, Nancy; Cowley, A. P. (1979), Michigan catalogue of two-dimensional spectral types for the HD stars, 1, Ann Arbor, Michigan: Dept. of Astronomy, University of Michigan, Bibcode:1978mcts.book.....H.
  5. Gontcharov, G. A. (November 2006), "Pulkovo Compilation of Radial Velocities for 35495 Hipparcos stars in a common system", Astronomy Letters, 32 (11): 759–771, arXiv:1606.08053, Bibcode:2006AstL...32..759G, doi:10.1134/S1063773706110065.
  6. "* kap Gru". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-06-26.
  7. Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x.
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