Star in the constellation of Pegasus
55 Pegasi is a single[ 11] star in the northern constellation of Pegasus . It is visible to the naked eye as a faint, reddish-hued point of light with a baseline apparent visual magnitude of 4.51.[ 2] The star is located approximately 302 light years away from the Sun based on parallax,[ 1] but it is moving closer with a radial velocity of −5 km/s.[ 5]
This is an aging red giant star on the asymptotic giant branch [ 12] with a stellar classification of M1IIIab,[ 3] having exhausted the supply of hydrogen at its core then expanded to 46 times the Sun's radius . It is a suspected variable , with an observed magnitude that ranges from 4.50 down to 4.56.[ 4] The star is around two billion years old with 1.6 times the mass of the Sun . It is radiating 483 times the luminosity of the Sun from its swollen photosphere at an effective temperature of 3,994 K.[ 8]
References
^ a b c d 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 Ducati, J. R. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". CDS/ADC Collection of Electronic Catalogues . 2237 . Bibcode :2002yCat.2237....0D .
^ a b Keenan, Philip C.; McNeil, Raymond C. (1989), "The Perkins catalog of revised MK types for the cooler stars", Astrophysical Journal Supplement Series , 71 : 245, Bibcode :1989ApJS...71..245K , doi :10.1086/191373 .
^ a b Watson, C. L. (2006). "The International Variable Star Index (VSX)". The Society for Astronomical Sciences 25th Annual Symposium on Telescope Science. Held May 23–25 . 25 : 47. Bibcode :2006SASS...25...47W .
^ a b Famaey, B.; et al. (2005). "Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data". Astronomy & Astrophysics . 430 : 165–186. arXiv :astro-ph/0409579 . Bibcode :2005A&A...430..165F . doi :10.1051/0004-6361:20041272 . S2CID 17804304 .
^ a b 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 . S2CID 18759600 . Vizier catalog entry
^ 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 . Vizier catalog entry
^ a b Baines, Ellyn K.; et al. (2018). "Fundamental Parameters of 87 Stars from the Navy Precision Optical Interferometer" . The Astronomical Journal . 155 (1). 30. arXiv :1712.08109 . Bibcode :2018AJ....155...30B . doi :10.3847/1538-3881/aa9d8b . S2CID 119427037 .
^ Zamanov, R. K.; et al. (October 2008). "Rotational velocities of the giants in symbiotic stars - III. Evidence of fast rotation in S-type symbiotics" . Monthly Notices of the Royal Astronomical Society . 390 (1): 377–382. arXiv :0807.3817 . Bibcode :2008MNRAS.390..377Z . doi :10.1111/j.1365-2966.2008.13751.x . S2CID 118697261 .
^ "55 Peg" . SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 2019-07-01 .
^ Eggleton, P. P.; Tokovinin, A. A. (2008). "A catalogue of multiplicity among bright stellar systems" . Monthly Notices of the Royal Astronomical Society . 389 (2): 869. arXiv :0806.2878 . Bibcode :2008MNRAS.389..869E . doi :10.1111/j.1365-2966.2008.13596.x . S2CID 14878976 .
^ 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 .