Summary
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]
| 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 mas[1] |
| Distance | 368 ± 6 ly (113 ± 2 pc) |
| Absolute magnitude (MV) | −1.04[3] |
| Details | |
| Radius | 29.59+0.60 −2.02[1] R☉ |
| Luminosity | 199.9±4.0[1] L☉ |
| Temperature | 3,990+143 −40[1] K |
| Other designations | |
| Database references | |
| SIMBAD | data |
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 edit
- ^ a b c d e f g h i j k l 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.
- ^ a b c 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.
- ^ a b c d 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.
- ^ a b Houk, Nancy; Cowley, A. P. (1979), Michigan catalogue of two-dimensional spectral types for the HD stars, vol. 1, Ann Arbor, Michigan: Dept. of Astronomy, University of Michigan, Bibcode:1978mcts.book.....H.
- ^ a b 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, S2CID 119231169.
- ^ "* kap Gru". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-06-26.
{{cite web}}: CS1 maint: postscript (link) - ^ 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, S2CID 14878976.