Observation data Epoch J2000.0 Equinox J2000.0 (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−V color 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 | |
Database references | |
SIMBAD | data |
ν Gruis, Latinised as Nu Gruis, is a solitary,[9] yellow-hued star in the southern constellation of Grus. It is visible to the naked eye with an apparent visual magnitude of 5.47.[2] The distance to this star, as determined using an annual parallax shift of 11.6 mas as seen from the Earth,[1] is 280 light years. It is drifting further away with a heliocentric radial velocity of +11 km/s.[4]
This is an evolved G-type giant star with a stellar classification of G9 III,[3] a star that has used up its core hydrogen and has expanded. At present it has ten[1] times the radius of the Sun and is radiating 52[1] times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,893 K.[7] It has a visual magnitude 12.50 companion, not visible even through binoculars, located at an angular separation of 21.70 arc seconds along a position angle of 74°, as of 2011.[10]