Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
---|---|
Constellation | Grus |
Right ascension | 22h 43m 29.97654s[1] |
Declination | −41° 24′ 51.6467″[1] |
Apparent magnitude (V) | 4.847[2] |
Characteristics | |
Evolutionary stage | horizontal branch[2] |
Spectral type | K0 III[3] |
U−B color index | +0.807[4] |
B−V color index | +1.026[4] |
Astrometry | |
Radial velocity (Rv) | 30.89±0.15[5] km/s |
Proper motion (μ) | RA: +10.11[1] mas/yr Dec.: −93.79[1] mas/yr |
Parallax (π) | 14.16 ± 0.19 mas[1] |
Distance | 230 ± 3 ly (70.6 ± 0.9 pc) |
Absolute magnitude (MV) | 0.685[2] |
Details | |
Mass | 1.91[2] M☉ |
Radius | 12.15+0.19 −0.65[5] R☉ |
Luminosity | 66.9±1.3[5] L☉ |
Surface gravity (log g) | 2.62[2] cgs |
Temperature | 4736.67+131.83 −36.67[5] K |
Metallicity [Fe/H] | −0.20[2] dex |
Other designations | |
Database references | |
SIMBAD | data |
Rho Gruis, a Latinization of ρ Gruis, is a solitary[7] star in the southern constellation of Grus. It is visible to the naked eye as a faint, orange-hued star with an apparent visual magnitude of 4.85.[2] Based upon an annual parallax shift of 14.16 mas as seen from the Earth,[1] the system is located about 230 light years from the Sun. It is drifting further away with a radial velocity of 31 km/s.[5]
This object is an evolved K-type giant star with a stellar classification of K0 III.[3] It has exhausted the supply of hydrogen at its core, causing it to cool and expand. At present it has 12[5] times the radius of the Sun. With 1.9 times the mass of the Sun[2] it is a red clump star,[2] which indicates it is on the horizontal branch generating energy through helium fusion at its core. It is radiating 67[5] times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 4,737 K.[5]
Rho Gruis has two visual companions: a magnitude 14.0 star at an angular separation of 19.3″ along a position angle (PA) of 302°, as of 2011, and a magnitude 10.28 star with a separation of 114.20″ and a PA of 336°, as of 1999.[8]