| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Grus |
| Right ascension | 23 00 52.79777 |
| Declination | −52° 45′ 14.8705″ |
| Apparent magnitude (V) | 4.12 |
| Characteristics | |
| Spectral type | K1 III Fe−1.2 CN−0.5 |
| U−B color index | +0.722 |
| B−V color index | +0.967 |
| Astrometry | |
| Radial velocity (Rv) | −1.1±2.7 km/s |
| Proper motion (μ) | RA: −57.911 mas/yr Dec.: −13.371 mas/yr |
| Parallax (π) | 24.5452 ± 0.5124 mas |
| Distance | 133 ± 3 ly (40.7 ± 0.9 pc) |
| Absolute magnitude (MV) | +1.49 |
| Details | |
| Radius | 9.86+0.32 −0.65 R☉ |
| Luminosity | 45.6±1.1 L☉ |
| Temperature | 4,778+166 −75 K |
| Other designations | |
| ζ Gru, CPD−53° 10382, FK5 868, HD 217364, HIP 113638, HR 8747, SAO 247680 | |
| Database references | |
| SIMBAD | data |
Zeta Gruis, Latinised from ζ Gruis, is a solitary 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 4.12. Based upon an annual parallax shift of 24.5 mas as seen from the Earth, the system is located about 133 light-years from the Sun.
This is an evolved K-type giant star with a stellar classification of K1 III Fe−1.2 CN−0.5, where the suffix notation indicates underabundances of iron and cyanogen in the spectrum. Having exhausted the supply of hydrogen at its core, the star has expanded and cooled; at present it has 10 times the girth of the Sun. The star is radiating 46 times the luminosity of the Sun from its swollen photosphere at an effective temperature of 4,778 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.
- ^ Jennens, P. A.; Helfer, H. L. (September 1975), "A new photometric metal abundance and luminosity calibration for field G and K giants", Monthly Notices of the Royal Astronomical Society, 172 (3): 667–679, Bibcode:1975MNRAS.172..667J, doi:10.1093/mnras/172.3.667.
- ^ Gray, R. O.; et al. (2006), "Contributions to the Nearby Stars (NStars) Project: spectroscopy of stars earlier than M0 within 40 pc-The Southern Sample", The Astronomical Journal, 132 (1): 161–70, arXiv:astro-ph/0603770, Bibcode:2006AJ....132..161G, doi:10.1086/504637, S2CID 119476992.
- 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.
- "zet Gru". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-06-28.
- Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.
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