Mu2 Gruis

Mu2 Gruis
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Grus
Right ascension 22h 16m 26.55881s[1]
Declination −41° 37′ 37.9851″[1]
Apparent magnitude (V) 5.10[2]
Characteristics
Spectral type G8 III[3]
B−V color index +0.92[2]
Astrometry
Radial velocity (Rv)+12.50[4] km/s
Proper motion (μ) RA: −12.57[1] mas/yr
Dec.: −6.72[1] mas/yr
Parallax (π)12.29 ± 0.64[1] mas
Distance270 ± 10 ly
(81 ± 4 pc)
Other designations
μ2 Gru, CD−42° 15846, HD 211202, HIP 109973, HR 8488, SAO 231063[5]
Database references
SIMBADdata

Mu2 Gruis (μ2 Gruis) is a star or star system in the southern constellation of Grus. It is a suspected astrometric binary, showing a variation in proper motion due to gravitational acceleration.[6] Mu2 Gruis is visible to the naked eye with an apparent visual magnitude of 5.10.[2] The distance to this system, as determined using an annual parallax shift of 12.29 mas as seen from the Earth,[1] is around 270 light years. The primary component is an evolved giant star with a stellar classification of G8 III.[3] It is a periodic variable star, showing a change in brightness with an amplitude of 0.004 magnitude at the rate of 7.50983 times per day.[7]

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, 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. ↑ Gontcharov, G. A. (November 2006), "Pulkovo Compilation of Radial Velocities for 35495 Hipparcos stars in a common system", Astronomy Letters, 32 (11): 759–771, Bibcode:2006AstL...32..759G, doi:10.1134/S1063773706110065.
  5. ↑ "mu.02 Gru -- Star", SIMBAD Astronomical Database, Centre de Données astronomiques de Strasbourg, retrieved 2017-06-26.
  6. ↑ Makarov, V. V.; Kaplan, G. H. (May 2005), "Statistical Constraints for Astrometric Binaries with Nonlinear Motion", The Astronomical Journal, 129 (5): 2420–2427, Bibcode:2005AJ....129.2420M, doi:10.1086/429590.
  7. ↑ Koen, Chris; Eyer, Laurent (2002), "New periodic variables from the Hipparcos epoch photometry", Monthly Notices of the Royal Astronomical Society, 331: 45, Bibcode:2002MNRAS.331...45K, arXiv:astro-ph/0112194 Freely accessible, doi:10.1046/j.1365-8711.2002.05150.x.
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