Epoch J2000 Equinox J2000
|Right ascension||19h 42m 34.00828s|
|Declination||+11° 49′ 35.7023″|
|Apparent magnitude (V)||5.292 (5.80/6.68)|
|Spectral type||G2 Ib-II + B5 V|
|U−B color index||-0.04|
|B−V color index||+0.57|
|Radial velocity (Rv)||-19.2 km/s|
|Proper motion (μ)||RA: 1.75 mas/yr
Dec.: -10.11 mas/yr
|Parallax (π)||3.82 ± 0.51 mas|
|Distance||approx. 900 ly
(approx. 260 pc)
Chi Aquilae (χ Aql, χ Aquilae) is the Bayer designation for a binary star in the equatorial constellation of Aquila, the eagle. This system is bright enough to be seen with the naked eye at a combined visual magnitude of +5.29. Based upon parallax measurements made during the Hipparcos mission, Chi Aquilae is at a distance of approximately 900 light-years (280 parsecs) from Earth.
The brighter member of Chi Aquilae is yellow-hued G-type star with a stellar classification of G2 Ib-II and an apparent magnitude of 5.80. A luminosity class of Ib-II indicates the spectrum lies midway between that of a bright giant and a supergiant star. The companion is a white-hued A-type main sequence star with a classification of B5 V and an apparent magnitude of 6.68. As of 2004, the secondary is located at an angular separation of 0.418 arcseconds along a position angle of 76.7° from the primary.
- van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357.
- Nordström, B.; et al. (May 2004), "The Geneva-Copenhagen survey of the Solar neighbourhood. Ages, metallicities, and kinematic properties of ˜14 000 F and G dwarfs", Astronomy and Astrophysics, 418: 989–1019, arXiv:, Bibcode:2004A&A...418..989N, doi:10.1051/0004-6361:20035959.
- 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, arXiv:, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x.
- "chi Aql -- Star", SIMBAD Astronomical Object Database, Centre de Données astronomiques de Strasbourg, retrieved 2012-07-05.
- Scardia, M.; et al. (April 2006), "Speckle observations with PISCO in Merate - II. Astrometric measurements of visual binaries in 2004", Monthly Notices of the Royal Astronomical Society, 367 (3): 1170–1180, Bibcode:2006MNRAS.367.1170S, doi:10.1111/j.1365-2966.2006.10035.x.
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