| Observation data EpochJ2000.0 EquinoxJ2000.0 (ICRS) | |
|---|---|
| Constellation | Grus |
| Right ascension | 22h 28m 39.21034s[1] |
| Declination | −39° 07′ 54.4505″[1] |
| Apparent magnitude (V) | 5.47[2] |
| Characteristics | |
| Spectral type | G9 III[3] |
| B−Vcolor index | +0.95[2] |
| Astrometry | |
| Radial velocity (Rv) | +10.6[4] km/s |
| Proper motion (μ) | RA: +37.43[5]mas/yr Dec.: −160.51[5]mas/yr |
| Parallax (π) | 11.6404±0.1235 mas[1] |
| Distance | 280 ± 3 ly (85.9 ± 0.9 pc) |
| Absolute magnitude (MV) | +0.76[6] |
| Details | |
| Radius | 9.68+0.30 −0.26[1] R☉ |
| Luminosity | 51.9+0.3 −0.7[1] L☉ |
| Surface gravity (log g) | 2.63±0.08[7] cgs |
| Temperature | 4,893±24[7] K |
| Metallicity[Fe/H] | −0.41±0.02[7] dex |
| Other designations | |
| ν Gru,CD−39°14723,FK5 845,HD 212953,HIP 110936,HR 8552,SAO 213850,WDS J22287-3908[8] | |
| Database references | |
| SIMBAD | data |
ν Gruis, Latinised asNu Gruis, is a solitary,[9] yellow-huedstar in the southernconstellation ofGrus. It is visible to the naked eye with anapparent visual magnitude of 5.47.[2] The distance to this star, as determined using an annualparallax shift of 11.6 mas as seen from the Earth,[1] is 280 light years. It is drifting further away with a heliocentricradial velocity of +11 km/s.[4]
This is anevolvedG-typegiant star with astellar classification of G9 III,[3] a star that has used up its corehydrogen and has expanded. At present it has ten[1] times theradius of the Sun and is radiating 52[1] times theSun's luminosity from its enlargedphotosphere at aneffective temperature of 4,893 K.[7] It has a visual magnitude 12.50 companion, not visible even through binoculars, located at anangular separation of 21.70 arc seconds along aposition angle of 74°, as of 2011.[10]
