Astronomy:Nu Gruis
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Grus |
| Right ascension | 22h 28m 39.21034s[1] |
| Declination | −39° 07′ 54.4505″[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[5] mas/yr Dec.: −160.51[5] mas/yr |
| Parallax (π) | 11.6404 ± 0.1235[1] mas |
| Distance | 280 ± 3 ly (85.9 ± 0.9 pc) |
| Absolute magnitude (MV) | +0.76[6] |
| Details | |
| Radius | 9.68+0.30 −0.26[1] R☉ |
| Luminosity | 51.9+0.3 −0.7[1] L☉ |
| Surface gravity (log g) | 2.63±0.08[7] cgs |
| Temperature | 4,893±24[7] K |
| Metallicity [Fe/H] | −0.41±0.02[7] dex |
| Other designations | |
| Database references | |
| SIMBAD | data |
ν Gruis, Latinised as Nu Gruis, is a solitary,[9] yellow-hued 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 11.6 mas as seen from the Earth,[1] is 280 light years. It is drifting further away with a heliocentric radial velocity of +11 km/s.[4]
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. At present it has ten[1] times the radius of the Sun and is radiating 52[1] times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,893 K.[7] 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.[10]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G. Gaia DR2 record for this source at VizieR.
- ↑ 2.0 2.1 2.2 Johnson, H. L. et al. (1966), "UBVRIJKL photometry of the bright stars", Communications of the Lunar and Planetary Laboratory 4 (99): 99, Bibcode: 1966CoLPL...4...99J.
- ↑ 3.0 3.1 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: 1982mcts.book.....H.
- ↑ 4.0 4.1 Wilson, R. E. (1953), "General Catalogue of Stellar Radial Velocities", Carnegie Institute Washington D.C. Publication (Carnegie Institute of Washington, D.C.), Bibcode: 1953GCRV..C......0W.
- ↑ 5.0 5.1 van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics 474 (2): 653–664, doi:10.1051/0004-6361:20078357, Bibcode: 2007A&A...474..653V.
- ↑ Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A.
- ↑ 7.0 7.1 7.2 7.3 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, doi:10.1093/mnras/stv189, Bibcode: 2015MNRAS.448.2749A.
- ↑ "nu. Gru -- Star", SIMBAD Astronomical Database (Centre de Données astronomiques de Strasbourg), http://simbad.u-strasbg.fr/simbad/sim-id?Ident=nu.+Gru, retrieved 2017-06-26.
- ↑ 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, doi:10.1111/j.1365-2966.2008.13596.x, Bibcode: 2008MNRAS.389..869E.
- ↑ Mason, B. D. et al. (2014), "The Washington Visual Double Star Catalog", The Astronomical Journal 122 (6): 3466, doi:10.1086/323920, Bibcode: 2001AJ....122.3466M.
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