| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Grus |
| Right ascension | 23 04 39.62786 |
| Declination | −53° 57′ 53.6651″ |
| Apparent magnitude (V) | 5.37 |
| Characteristics | |
| Evolutionary stage | asymptotic giant branch |
| Spectral type | K5 III |
| B−V color index | +1.45 |
| Astrometry | |
| Radial velocity (Rv) | +17.7±0.8 km/s |
| Proper motion (μ) | RA: +57.047 mas/yr Dec.: −104.882 mas/yr |
| Parallax (π) | 8.8748 ± 0.1536 mas |
| Distance | 368 ± 6 ly (113 ± 2 pc) |
| Absolute magnitude (MV) | −1.04 |
| Details | |
| Radius | 29.59+0.60 −2.02 R☉ |
| Luminosity | 199.9±4.0 L☉ |
| Temperature | 3,990+143 −40 K |
| Other designations | |
| κ Gru, CPD−54° 10197, FK5 3845, HD 217902, HIP 113957, HR 8774, SAO 247711 | |
| Database references | |
| SIMBAD | data |
κ Gruis, Latinised as Kappa Gruis, is a solitary star in the southern constellation of Grus. With an apparent magnitude of 5.37, 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, is roughly 368 light years. It is drifting further away with a heliocentric radial velocity of +18 km/s. It is a member of the Arcturus moving group.
This is an evolved K-type giant star on the asymptotic giant branch with a stellar classification of K5 III. With the supply of hydrogen at its core exhausted, it has expanded and now spans 29.6 times the radius of the Sun. It is radiating 200 times the Sun's luminosity from its enlarged photosphere at an effective temperature of 3,990 K.
References
- ^ 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.
- ^ 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.
- ^ 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.
- ^ 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.
- ^ 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.
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