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Star in the constellation Aquila
22 Aquilae , abbreviated 22 Aql , is a star in the equatorial constellation of Aquila . 22 Aquilae is its Flamsteed designation . It is a faint star but visible to the naked eye with an apparent visual magnitude of 5.59. The distance to 22 Aql can be estimated from its annual parallax shift of 4.74 mas , which yields a separation of 690 light years . It is moving closer to the Earth with a heliocentric radial velocity of −23 km/s.
Cowley et al. (1969) assigned this star a stellar classification of A3 IV, matching an evolving subgiant star that has exhausted the hydrogen at its core. Houk and Swift (1999) reassigned it as an A-type main-sequence star with a class of A1 V. It has nearly three times the mass of the Sun and is spinning with a projected rotational velocity of 70 km/s. The star is radiating 161 times the Sun's luminosity from its photosphere at an effective temperature of 8,453 K.
References
^ Brown, A. G. A. ; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties" . Astronomy & Astrophysics 616 . A1. arXiv :1804.09365 . Bibcode :2018A&A...616A...1G . doi :10.1051/0004-6361/201833051 .
^ Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters , 38 (5): 331, arXiv :1108.4971 , Bibcode :2012AstL...38..331A , doi :10.1134/S1063773712050015 , S2CID 119257644 .
^ Houk, N.; Swift, C. (1999), "Michigan catalogue of two-dimensional spectral types for the HD Stars", Michigan Spectral Survey , 5 , Bibcode :1999MSS...C05....0H .
^ Cowley, A.; et al. (April 1969), "A study of the bright A stars. I. A catalogue of spectral classifications", Astronomical Journal , 74 : 375–406, Bibcode :1969AJ.....74..375C , doi :10.1086/110819 .
^ Gontcharov, G. A. (2006), "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system", Astronomy Letters , 32 (11): 759–771, arXiv :1606.08053 , Bibcode :2006AstL...32..759G , doi :10.1134/S1063773706110065 , S2CID 119231169 .
^ Zorec, J.; Royer, F. (2012), "Rotational velocities of A-type stars. IV. Evolution of rotational velocities", Astronomy & Astrophysics , 537 : A120, arXiv :1201.2052 , Bibcode :2012A&A...537A.120Z , doi :10.1051/0004-6361/201117691 , S2CID 55586789 .
"22 Aql" . SIMBAD Centre de données astronomiques de Strasbourg . Retrieved October 31, 2018.
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