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.
Epoch J2000.0 Equinox J2000.0 (ICRS)
|Right ascension||23h 04m 39.62786s|
|Declination||−53° 57′ 53.6651″|
|Apparent magnitude (V)||5.37|
|Evolutionary stage||asymptotic giant branch|
|Spectral type||K5 III|
|B−V color index||+1.45|
|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|
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.
- 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.
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