Astronomy:HD 220766

HD 220766
Observation data; Equinox J2000.0]] (ICRS)
Constellation	Aquarius
Right ascension	23h 26m 35.47400s
Declination	−21° 44′ 27.0169″
Apparent magnitude (V)	6.44
Characteristics
Spectral type	K0III
B−V color index	+1.04
Astrometry
Radial velocity (Rv)	+11.1 km/s
Proper motion (μ)	RA: +56.91 mas/yr ; Dec.: −2.36 mas/yr
Parallax (π)	8.55 ± 0.66 mas
Distance	380 ± 30 ly ; (117 ± 9 pc)
Other designations
	BD−22° 6128, HD 220766, HIP 115709, SAO 191907.
Database references
SIMBAD	data

Short description: Star in the constellation Aquarius

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]

References

↑ ^1.0 ^1.1 ^1.2 ^1.3 ^1.4 van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics 474 (2): 653–664. doi:10.1051/0004-6361:20078357. Bibcode: 2007A&A...474..653V.
↑ ^2.0 ^2.1 ^2.2 Høg, E. et al. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics 355: L27. doi:10.1888/0333750888/2862. Bibcode: 2000A&A...355L..27H.
↑ ^3.0 ^3.1 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.
↑ Wilson, R. E. (1953). General Catalogue of Stellar Radial Velocities. Carnegie Institute of Washington, D.C.. Bibcode: 1953GCRV..C......0W.
↑ Mason, B. D. et al. (2014). "The Washington Visual Double Star Catalog". The Astronomical Journal 122: 3466–3471. doi:10.1086/323920. Bibcode: 2001AJ....122.3466M. http://vizier.u-strasbg.fr/viz-bin/VizieR?-source=B/wds. Retrieved 2015-07-22.

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