Zeta Gruis

Zeta Gruis, Latinized from ζ 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 4.12.[2] Based upon an annual parallax shift of 24.5 mas as seen from the Earth,[1] the system is located about 133 light years from the Sun.

Zeta Gruis
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Grus
Right ascension  23h 00m 52.79777s[1]
Declination −52° 45′ 14.8705″[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: −57.911[1] mas/yr
Dec.: −13.371[1] mas/yr
Parallax (π)24.5452 ± 0.5124[1] mas
Distance133 ± 3 ly
(40.7 ± 0.9 pc)
Absolute magnitude (MV)+1.49[5]
Details
Radius9.86+0.32
−0.65[1] R☉
Luminosity45.6±1.1[1] L☉
Temperature4778+166
−75[1] K
Other designations
ζ Gru, CPD−53° 10382, FK5 868, HD 217364, HIP 113638, HR 8747, SAO 247680[6]
Database references
SIMBADdata

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 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[1] times the girth of the Sun. The star is radiating 46[1] times the luminosity of the Sun from its swollen photosphere at an effective temperature of 4,778.[1]

References
  1. 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.
  2. 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. 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.
  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, arXiv:1606.08053, Bibcode:2006AstL...32..759G, doi:10.1134/S1063773706110065.
  5. 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.
  6. "zet Gru". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-06-28.
  7. 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.
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