HD 180450
Star in the constellation Lyra
HD 180450 is a single[ 4] star in the northern constellation of Lyra , positioned about half a degree to the NNW of the globular cluster M56 .[ 5] At an apparent visual magnitude of 5.88,[ 2] it is dimly visible to the naked eye under good viewing conditions. This star is located at a distance of approximately 1,400 light years from the Sun based on parallax measurements, but is drifting closer with a radial velocity of −64.4 km/s.[ 1]
This is an aging red giant star with a stellar classification of M1IIIab,[ 2] It is currently on the asymptotic giant branch ,[ 6] having exhausted the supply of hydrogen in its core and evolved of the main sequence . It has expanded to ~68 times the radius of the Sun and is radiating a thousand times the Sun' luminosity from its enlarged photosphere at en effective temperature of 3,947 K.[ 1]
References
^ a b c d e f g h i j k 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 . Gaia DR2 record for this source at VizieR .
^ a b c d e f 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 .
^ "HD 180450" . SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 2021-10-14 .
^ 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 :0806.2878 , Bibcode :2008MNRAS.389..869E , doi :10.1111/j.1365-2966.2008.13596.x , S2CID 14878976 .
^ Sinnott, Roger W.; Perryman, Michael A. C. (1997), Millennium Star Atlas , vol. 3, Sky Publishing Corporation and the European Space Agency, p. 1174, ISBN 0-933346-84-0 .
^ Eggen, Olin J. (July 1992), "Asymptotic giant branch stars near the sun", Astronomical Journal , 104 (1): 275–313, Bibcode :1992AJ....104..275E , doi :10.1086/116239 .