Zeta Gruis

Zeta Gruis
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Grus
Right ascension 23h 00m 52.81281s[1]
Declination −52° 45′ 14.8808″[1]
Apparent magnitude (V) 4.12[2]
Characteristics
Spectral type K1 III Fe−1.2 CN−0.5[3]
U−B color index +0.722[2]
B−V color index +0.967[2]
Astrometry
Radial velocity (Rv)−1.1±2.7[4] km/s
Proper motion (μ) RA: −63.96[1] mas/yr
Dec.: −11.53[1] mas/yr
Parallax (π)29.96 ± 0.83[1] mas
Distance109 ± 3 ly
(33.4 ± 0.9 pc)
Other designations
ζ Gru, CPD−53° 10382, FK5 868, HD 217364, HIP 113638, HR 8747, SAO 247680[5]
Database references
SIMBADdata

Zeta Gruis (ζ Gruis) is a solitary,[6] orange-hued star in the southern constellation of Grus. It is visible to the naked eye with an apparent visual magnitude of 4.12.[2] Based upon an annual parallax shift of 29.96 mas as seen from the Earth,[1] the system is located about 109 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,[3] where the suffix notation indicates abnormally low abundances of iron and cyanogen in the spectrum.

References

  1. 1 2 3 4 5 6 van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, Bibcode:2007A&A...474..653V, arXiv:0708.1752 Freely accessible, doi:10.1051/0004-6361:20078357.
  2. 1 2 3 4 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: 667–679, Bibcode:1975MNRAS.172..667J, doi:10.1093/mnras/172.3.667.
  3. 1 2 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, Bibcode:2006AJ....132..161G, arXiv:astro-ph/0603770 Freely accessible, doi:10.1086/504637.
  4. ↑ Gontcharov, G. A. (November 2006), "Pulkovo Compilation of Radial Velocities for 35495 Hipparcos stars in a common system", Astronomy Letters, 32 (11): 759–771, Bibcode:2006AstL...32..759G, doi:10.1134/S1063773706110065.
  5. ↑ "zet Gru -- Star", SIMBAD Astronomical Database, Centre de Données astronomiques de Strasbourg, retrieved 2017-06-28.
  6. ↑ 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, Bibcode:2008MNRAS.389..869E, arXiv:0806.2878 Freely accessible, doi:10.1111/j.1365-2966.2008.13596.x.
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