Xi Gruis

ξ Gruis, Latinised as Xi Gruis, is a solitary[6] star in the southern constellation of Grus, near the constellation border with Microscopium. It is visible to the naked eye as a dim, orange-hued star with an apparent visual magnitude of 5.3.[2] The star is located about 430 light years distant from the Sun, based on parallax, but is drifting closer with a radial velocity of −10 km/s.[1]

Xi Gruis
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Grus
Right ascension 21h 32m 05.87583s[1]
Declination −41° 10′ 45.5242″[1]
Apparent magnitude (V) 5.29[2]
Characteristics
Spectral type K0 III[3]
B−V color index +1.10[2]
Astrometry
Radial velocity (Rv)−9.81±0.13[1] km/s
Proper motion (μ) RA: +19.427[1] mas/yr
Dec.: +11.278[1] mas/yr
Parallax (π)7.5904 ± 0.1226[1] mas
Distance430 ± 7 ly
(132 ± 2 pc)
Absolute magnitude (MV)−0.47[4]
Details
Radius19.2±0.6[1] R☉
Luminosity161.7±3.1[1] L☉
Temperature4,703+76
−74[1] K
Other designations
ξ Gru, CD−41° 14550, FK5 3719, HD 204783, HIP 106327, HR 8229, SAO 230726[5]
Database references
SIMBADdata

This is an evolved giant star with a stellar classification of K0 III,[3] having exhausted the supply of hydrogen at its core then cooled and expanded. It now has 19 times the girth of the Sun and is radiating 12 times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,703 K.[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. Johnson, H. L.; et al. (1966), "UBVRIJKL photometry of the bright stars", Communications of the Lunar and Planetary Laboratory, 4 (99), Bibcode:1966CoLPL...4...99J.
  3. Houk, N. (1978), Michigan catalogue of two-dimensional spectral types for the HD stars, 2, Dept. of Astronomy, University of Michigan, Bibcode:1978mcts.book.....H.
  4. 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.
  5. "ksi Gru -- Star", SIMBAD Astronomical Database, Centre de Données astronomiques de Strasbourg, retrieved 2017-06-26.
  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, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x.
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