| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Grus |
| Right ascension | 22 16 26.54790 |
| Declination | −41° 37′ 37.8266″ |
| Apparent magnitude (V) | 5.10 |
| Characteristics | |
| Spectral type | G8 III |
| B−V color index | +0.92 |
| Astrometry | |
| Radial velocity (Rv) | +12.50 km/s |
| Proper motion (μ) | RA: −14.788 mas/yr Dec.: −15.530 mas/yr |
| Parallax (π) | 13.1578 ± 0.1559 mas |
| Distance | 248 ± 3 ly (76.0 ± 0.9 pc) |
| Absolute magnitude (MV) | +0.56 |
| Details | |
| Radius | 9.97+0.32 −0.20 R☉ |
| Luminosity | 56.37±0.78 L☉ |
| Temperature | 5009+52 −79 K |
| Other designations | |
| μ Gru, CD−42° 15846, HD 211202, HIP 109973, HR 8488, SAO 231063 | |
| Database references | |
| SIMBAD | data |
Mu Gruis, Latinized from μ 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. Mu Gruis is visible to the naked eye with an apparent visual magnitude of 5.10. The distance to this system, as determined using an annual parallax shift of 13.2 mas as seen from the Earth, is around 248 light years. It is drifting further away with a heliocentric radial velocity of +12.5 km/s.
The primary component is an evolved giant star with a stellar classification of G8 III. 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. 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 times the luminosity of the Sun from its swollen photosphere at an effective temperature of 5,009 K.
References
- ^ Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
- ^ Johnson, H. L.; et al. (1966), "UBVRIJKL photometry of the bright stars", Communications of the Lunar and Planetary Laboratory, 4 (99): 99, Bibcode:1966CoLPL...4...99J.
- ^ Houk, N. (1978), Michigan catalogue of two-dimensional spectral types for the HD stars, vol. 2, Dept. of Astronomy, University of Michigan, Bibcode:1978mcts.book.....H.
- ^ Gontcharov, G. A. (November 2006), "Pulkovo Compilation of Radial Velocities for 35495 Hipparcos stars in a common system", Astronomy Letters, 32 (11): 759–771, arXiv:1606.08053, Bibcode:2006AstL...32..759G, doi:10.1134/S1063773706110065, S2CID 119231169.
- Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015, S2CID 119257644.
- "mu.02 Gru -- Star", SIMBAD Astronomical Database, Centre de Données astronomiques de Strasbourg, retrieved 2017-06-26.
- Makarov, V. V.; Kaplan, G. H. (May 2005), "Statistical Constraints for Astrometric Binaries with Nonlinear Motion", The Astronomical Journal, 129 (5): 2420–2427, Bibcode:2005AJ....129.2420M, doi:10.1086/429590.
- Koen, Chris; Eyer, Laurent (2002), "New periodic variables from the Hipparcos epoch photometry", Monthly Notices of the Royal Astronomical Society, 331 (1): 45–59, arXiv:astro-ph/0112194, Bibcode:2002MNRAS.331...45K, doi:10.1046/j.1365-8711.2002.05150.x, S2CID 10505995.
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