Eta Gruis

Eta Gruis
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Grus
Right ascension 22h 45m 37.88204s[1]
Declination −53° 30′ 00.4353″[1]
Apparent magnitude (V) 4.85[2]
Characteristics
Spectral type K2 III CNIV[3]
U−B color index +1.17[2]
B−V color index +1.18[2]
Astrometry
Radial velocity (Rv)+27.8±2.8[4] km/s
Proper motion (μ) RA: +30.59[1] mas/yr
Dec.: +17.37[1] mas/yr
Parallax (π)7.86 ± 0.23[1] mas
Distance410 ± 10 ly
(127 ± 4 pc)
Other designations
η Gru, CPD−54° 10123, FK5 3821, HD 215369, HIP 112374, HR 8655, SAO 247570[5]
Database references
SIMBADdata

Eta Gruis (η Gruis) is a solitary,[6] orange-hued star in the southern constellation of Grus. It is visible to the naked eye with an apparent visual magnitude of 4.85.[2] Based upon an annual parallax shift of 7.86 mas as seen from the Earth,[1] the system is located about 410 light years from the Sun. This is an evolved K-type giant star with a stellar classification of K2 III CNIV,[3] indicating this is an intermediate CN star. It is a periodic microvariable with an amplitude of 0.0055 magnitude and a frequency of 0.36118 cycles 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 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 Houk, Nancy; Cowley, A. P. (1979), Michigan catalogue of two-dimensional spectral types for the HD stars, 1, Ann Arbor, Michigan: 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. ↑ "eta Gru -- Star", SIMBAD Astronomical Database, Centre de Données astronomiques de Strasbourg, retrieved 2017-06-28.
  6. ↑ 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.
  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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