Mu1 Gruis

Mu1 Gruis
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Grus
Right ascension 22h 15m 36.92125s[1]
Declination −41° 20′ 48.1042″[1]
Apparent magnitude (V) 4.79[2] (5.20 + 6.68)[3]
Characteristics
Spectral type G8 III + G[4]
U−B color index +0.47[2]
B−V color index +0.80[2]
Astrometry
Radial velocity (Rv)−7.20±1.78[5] km/s
Proper motion (μ) RA: +47.01[1] mas/yr
Dec.: +22.50[1] mas/yr
Parallax (π)11.87 ± 0.43[1] mas
Distance275 ± 10 ly
(84 ± 3 pc)
Other designations
μ1 Gru, CD−41° 14810, FK5 3777, HD 211088, HIP 109908, HR 8486, SAO 231055, WDS J22156-4121[6]
Database references
SIMBADdata

Mu1 Gruis (μ1 Gruis) is a binary star[3] system in the southern constellation of Grus. It is visible to the naked eye with a combined apparent visual magnitude of 4.79.[2] The distance to this system, as determined using an annual parallax shift of 11.44 mas as seen from the Earth,[1] is around 275 light years. The primary component is an evolved giant star with stellar classification of G III[4] and visual magnitude 5.20.[3] The secondary is magnitude 6.68 G-type star.[3]

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 4 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 3 4 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.
  4. 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.
  5. ↑ Kharchenko, N. V.; et al. (2007), "Astrophysical supplements to the ASCC-2.5: Ia. Radial velocities of ~55000 stars and mean radial velocities of 516 Galactic open clusters and associations", Astronomische Nachrichten, 328 (9): 889–896, Bibcode:2007AN....328..889K, arXiv:0705.0878 Freely accessible, doi:10.1002/asna.200710776.
  6. ↑ "mu.01 Gru -- Double or multiple star", SIMBAD Astronomical Database, Centre de Données astronomiques de Strasbourg, retrieved 2017-06-26.
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