Upsilon Gruis

υ Gruis, Latinised as Upsilon Gruis, is a double star in the southern constellation of Grus. The apparent magnitude is 5.61, which is bright enough to be viewed with the naked eye. Located around 87 parsecs (280 ly) distant, the white-hued primary is an A-type main-sequence star of spectral type A1V, a star that is currently fusing its core hydrogen. it is spinning rapidly with a projected rotational velocity of 320 km/s. The companion is a magnitude 8.24 star at an angular separation of 0.90″ from the primary along a position angle of 205°, as of 2009.[10]

υ Gruis
Observation data
Epoch J2000      Equinox J2000
Constellation Grus
Right ascension  23h 06m 53.62552s[1]
Declination −38° 53′ 32.2484″[1]
Apparent magnitude (V) 5.614[2]
Characteristics
Spectral type A1V[3]
B−V color index +0.01[4]
Astrometry
Radial velocity (Rv)+16[5] km/s
Proper motion (μ) RA: +34.31[1] mas/yr
Dec.: +6.40[1] mas/yr
Parallax (π)11.45 ± 0.56[1] mas
Distance280 ± 10 ly
(87 ± 4 pc)
Absolute magnitude (MV)+0.92[6]
Details
Radius2.2[7] R☉
Luminosity42[6] L☉
Temperature10,141 ± 290[2] K
Rotational velocity (v sin i)320[8] km/s
Other designations
υ Gru, CD−39° 14936, HD 218242, HIP 114132, HR 8790, SAO 214313.[9]
Database references
SIMBADdata

References
  1. van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357.
  2. Paunzen, E.; et al. (October 2006), "An empirical temperature calibration for the Δ a photometric system. II. The A-type and mid F-type stars", Astronomy and Astrophysics, 458 (1): 293–296, arXiv:astro-ph/0607567, Bibcode:2006A&A...458..293P, doi:10.1051/0004-6361:20064889.
  3. Houk, Nancy (1979), 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. Nicolet, B. (1978), "Photoelectric photometric Catalogue of homogeneous measurements in the UBV System", Astronomy and Astrophysics Supplement Series, 34: 1–49, Bibcode:1978A&AS...34....1N.
  5. Wilson, R. E. (1953), General Catalogue of Stellar Radial Velocities, Carnegie Institute of Washington, D.C., Bibcode:1953GCRV..C......0W.
  6. 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.
  7. Pasinetti Fracassini, L. E.; Pastori, L.; Covino, S.; Pozzi, A. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS) - Third edition", Astronomy and Astrophysics, 367: 521–524, arXiv:astro-ph/0012289, Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451.
  8. Royer, F.; et al. (February 2007), "Rotational velocities of A-type stars. III. Velocity distributions", Astronomy and Astrophysics, 463 (2): 671–682, arXiv:astro-ph/0610785, Bibcode:2007A&A...463..671R, doi:10.1051/0004-6361:20065224.
  9. "ups Gru -- Double or multiple star", SIMBAD Astronomical Database, Centre de Données astronomiques de Strasbourg, retrieved 2016-09-02.
  10. Mason, B. D.; et al. (2014), The Washington Visual Double Star Catalog, Bibcode:2001AJ....122.3466M, doi:10.1086/323920, retrieved 2015-07-22


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