EZ Aquarii – Wikipedia

Star in the constellation Aquarius

Coordinates: Sky map22h 38m 33.73s, −15° 17′ 57.3″

EZ Aquarii is a triple star system approximately 11.3 ly (3.5 pc) from the Sun in the constellation Aquarius. It is also known as Luyten 789-6 and Gliese 866. All three components are M-type red dwarfs. The pair EZ Aquarii AC form a spectroscopic binary with a 3.8-day orbit and a 0.03 AU separation. This pair share an orbit with EZ Aquarii B that has an 823-day period.[10] The A and B components of Luyten 789-6 together emit X-rays.[11]

The configuration of the inner binary pair may permit a circumbinary planet to orbit near their habitable zone.[12] EZ Aquarii is approaching the Solar System and, in about 32,300 years, will be at its minimal distance of about 8.2 ly (2.5 pc) from the Sun.[13] The ChView simulation shows that currently its nearest neighbouring star is Lacaille 9352 at about 4.1 ly (1.3 pc) from EZ Aquarii.

See also[edit]


  1. ^ a b Cutri, R. M.; et al. (June 2003). 2MASS All Sky Catalog of point sources. NASA. Bibcode:2003tmc..book…..C.
  2. ^ a b c d “The One Hundred Nearest Star Systems”. RECONS. Georgia State University. Archived from the original on 2012-05-13. Retrieved 2010-06-30.
  3. ^ Eggen, O. J.; Greenstein, J. L. (October 1965). “Observations of proper-motion stars. II”. Astrophysical Journal. 142: 925. Bibcode:1965ApJ…142..925E. doi:10.1086/148362.
  4. ^ Wilson, Ralph Elmer (1953). “General Catalogue of Stellar Radial Velocities”. Carnegie Institute Washington D.C. Publication. Washington: Carnegie Institution of Washington. Bibcode:1953GCRV..C……0W.
  5. ^ a b Salim, Samir; Gould, Andrew (January 2003). “Improved Astrometry and Photometry for the Luyten Catalog. II. Faint Stars and the Revised Catalog”. The Astrophysical Journal. 582 (2): 1011–1031. arXiv:astro-ph/0206318. Bibcode:2003ApJ…582.1011S. doi:10.1086/344822. S2CID 19035401.
  6. ^ Torres, G.; Andersen, J.; Giménez, A. (2010). “Accurate masses and radii of normal stars: modern results and applications”. The Astronomy & Astrophysics Review. 18 (1–2): 67–126. arXiv:0908.2624. Bibcode:2010A&ARv..18…67T. doi:10.1007/s00159-009-0025-1. S2CID 14006009. VizieR
  7. ^ Woitas, J.; Leinert, Ch.; Jahreiß, H.; Henry, T.; Franz, O. G.; Wasserman, L. H. (January 2000). “The nearby M-dwarf system Gliese 866 revisited”. Astronomy and Astrophysics. 353: 253–256. arXiv:astro-ph/9910411. Bibcode:2000A&A…353..253W.
  8. ^ Gliese, W.; Jahreiß, H. (1991). “Gl 866”. Preliminary Version of the Third Catalogue of Nearby Stars. Retrieved 2014-10-20.
  9. ^ “EZ Aqr”. SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2021-12-14.
  10. ^ Delfosse, Xavier; et al. (October 1999), “Accurate masses of very low mass stars. II. The very low mass triple system GL 866”, Astronomy and Astrophysics, 350: L39–L42, arXiv:astro-ph/9909409, Bibcode:1999A&A…350L..39D
  11. ^ Schmitt, J.H.M.M.; Golub, L.; Harnden, F.R. Jr.; Maxson, C.W.; Rosner, R.; Vaiana, G.S. (March 1985). “An Einstein Observatory X-ray survey of main-sequence stars with shallow convection zones”. Astrophysical Journal. 290 (Part 1): 307–320. Bibcode:1985ApJ…290..307S. doi:10.1086/162986.
  12. ^ Popova, E. A.; Shevchenko, I. I. (April 2016), “On possible circumbinary configurations of the planetary systems of α Centauri and EZ Aquarii”, Astronomy Letters, 42 (4): 260–267, Bibcode:2016AstL…42..260P, doi:10.1134/S106377371604006X, S2CID 123811835.
  13. ^ Bobylev, V. V. (November 2010), “Stars outside the Hipparcos list closely encountering the Solar system”, Astronomy Letters, 36 (11): 816–822, arXiv:1009.4856, Bibcode:2010AstL…36..816B, doi:10.1134/S1063773710110071, S2CID 118512652

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