Global InformationMu2 Gruis information
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Grus |
| Right ascension | 22h 16m 26.54790s[1] |
| Declination | −41° 37′ 37.8266″[1] |
| Apparent magnitude (V) | 5.10[2] |
| Characteristics | |
| Spectral type | G8 III[3] |
| B−V color index | +0.92[2] |
| Astrometry | |
| Radial velocity (Rv) | +12.50[4] km/s |
| Proper motion (μ) | RA: −14.788[1] mas/yr Dec.: −15.530[1] mas/yr |
| Parallax (π) | 13.1578 ± 0.1559 mas[1] |
| Distance | 248 ± 3 ly (76.0 ± 0.9 pc) |
| Absolute magnitude (MV) | +0.56[5] |
| Details | |
| Radius | 9.97+0.32 −0.20[1] R☉ |
| Luminosity | 56.37±0.78[1] L☉ |
| Temperature | 5009+52 −79[1] K |
| Other designations | |
μ2 Gru, CD−42° 15846, HD 211202, HIP 109973, HR 8488, SAO 231063[6] | |
| Database references | |
| SIMBAD | data |
Mu2 Gruis, Latinized from μ2 Gruis, is a yellow-hued star or star system in the southern constellation of Grus. It is a suspected astrometric binary, showing a variation in proper motion due to gravitational acceleration.[7] Mu2 Gruis is visible to the naked eye with an apparent visual magnitude of 5.10.[2] The distance to this system, as determined using an annual parallax shift of 13.2 mas as seen from the Earth,[1] is around 248 light years. It is drifting further away with a heliocentric radial velocity of +12.5 km/s.[4]
The primary component is an evolved giant star with a stellar classification of G8 III.[3] It is a periodic variable star, showing a change in brightness with an amplitude of 0.004 magnitude at the rate of 7.50983 times per day.[8] With the supply of hydrogen at its core exhausted, the star has cooled and expanded until now it has 10 times the radius of the Sun. It is radiating 56[1] times the luminosity of the Sun from its swollen photosphere at an effective temperature of 5,009 K.[1]
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