Kappa Gruis
Star in the constellation Grus
From Wikipedia, the free encyclopedia
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 | |
| κ Gru, CPD−54°10197, FK5 3845, HD 217902, HIP 113957, HR 8774, SAO 247711[6] | |
| 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]