HD 220766

HD 220766 is a double star in the equatorial constellation of Aquarius. The primary is a K-type giant star with a stellar classification of K0III[3] and an apparent magnitude of 6.44.[2] It has a faint, magnitude 12 companion, located at an angular separation of 5.0″ along a position angle of 132° (as of 1933).[5]

HD 220766
Observation data
Epoch J2000      Equinox J2000
Constellation Aquarius
Right ascension 23h 26m 35.47400s[1]
Declination −21° 44′ 27.0169″[1]
Apparent magnitude (V) 6.44[2]
Characteristics
Spectral type K0III[3]
B−V color index +1.04[2]
Astrometry
Radial velocity (Rv)+11.1[4] km/s
Proper motion (μ) RA: +56.91[1] mas/yr
Dec.: −2.36[1] mas/yr
Parallax (π)8.55 ± 0.66[1] mas
Distance380 ± 30 ly
(117 ± 9 pc)
Other designations
BD−22° 6128, HD 220766, HIP 115709, SAO 191907.
Database references
SIMBADdata

References
  1. van Leeuwen, F. (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. Høg, E.; et al. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27. Bibcode:2000A&A...355L..27H. doi:10.1888/0333750888/2862.
  3. Houk, Nancy; Smith-Moore, M. (1978). "Michigan catalogue of two-dimensional spectral types for the HD stars". 4. Ann Arbor: Dept. of Astronomy, University of Michigan. Bibcode:1988mcts.book.....H. Cite journal requires |journal= (help)
  4. Wilson, R. E. (1953). "General Catalogue of Stellar Radial Velocities". Carnegie Institute of Washington, D.C. Bibcode:1953GCRV..C......0W. Cite journal requires |journal= (help)
  5. Mason, B. D.; et al. (2014). "The Washington Visual Double Star Catalog". The Astronomical Journal. 122: 3466–3471. Bibcode:2001AJ....122.3466M. doi:10.1086/323920. Retrieved 2015-07-22.
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