Nu Gruis

Nu Gruis
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Grus
Right ascension 22h 28m 29.21012s[1]
Declination −39° 07′ 54.4477″[1]
Apparent magnitude (V) 5.47[2]
Characteristics
Spectral type G9 III[3]
B−V color index +0.95[2]
Astrometry
Radial velocity (Rv)+10.6[4] km/s
Proper motion (μ) RA: +37.43[1] mas/yr
Dec.: −160.51[1] mas/yr
Parallax (π)11.44 ± 0.29[1] mas
Distance285 ± 7 ly
(87 ± 2 pc)
Details
Surface gravity (log g)2.63±0.08[5] cgs
Temperature4,893±24[5] K
Metallicity [Fe/H]−0.41±0.02[5] dex
Other designations
ν Gru, CD−39° 14723, FK5 845, HD 212953, HIP 110936, HR 8552, SAO 213850, WDS J22287-3908[6]
Database references
SIMBADdata

ν Gruis, Latinised as Nu Gruis, is a solitary[7] star in the southern constellation of Grus. It is visible to the naked eye with an apparent visual magnitude of 5.47.[2] The distance to this star, as determined using an annual parallax shift of 11.44 mas as seen from the Earth,[1] is 285 light years. This is an evolved G-type giant star with a stellar classification of G9 III,[3] a star that has used up its core hydrogen and has expanded. It has a visual magnitude 12.50 companion, not visible even through binoculars, located at an angular separation of 21.70 arc seconds along a position angle of 74°, as of 2011.[8]

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 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. 1 2 Houk, Nancy (1979), Michigan catalogue of two-dimensional spectral types for the HD stars, 3, Ann Arbor, Michigan: Dept. of Astronomy, University of Michigan, Bibcode:1982MSS...C03....0H.
  4. ↑ Wilson, R. E. (1953), General Catalogue of Stellar Radial Velocities, Carnegie Institute of Washington, D.C., Bibcode:1953GCRV..C......0W.
  5. 1 2 3 Alves, S.; et al. (April 2015), "Determination of the spectroscopic stellar parameters for 257 field giant stars", Monthly Notices of the Royal Astronomical Society, 448 (3): 2749–2765, Bibcode:2015MNRAS.448.2749A, arXiv:1503.02556 Freely accessible, doi:10.1093/mnras/stv189.
  6. ↑ "nu. Gru -- Star", SIMBAD Astronomical Database, Centre de Données astronomiques de Strasbourg, retrieved 2017-06-26.
  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, Bibcode:2008MNRAS.389..869E, arXiv:0806.2878 Freely accessible, doi:10.1111/j.1365-2966.2008.13596.x.
  8. ↑ Mason, B. D.; et al. (2014), The Washington Visual Double Star Catalog, Bibcode:2001AJ....122.3466M, doi:10.1086/323920.
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