1 Pegasi

Triple star system in the constellation Pegasus 1 Pegasi Pegasus constellation map.svg center 280 right Red circle.svg 10 1 Pegasi 843 430 Location of 1 Pegasi (circled) J2000 Pegasus 21 22 05.19950 19 48 16.2375 4.092002yCat.2237....0D VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system CDS/ADC Collection of Electronic Catalogues 2237 Ducati J. R. 2002 K1III1995yCat.5050....0H VizieR Online Data Catalog: Bright Star Catalogue, 5th Revised Ed. (Hoffleit+, 1991) VizieR On-line Data Catalog: V/50. Originally Published in: 1964BS....C......0H 5050 Hoffleit D. Warren W. H. 1995 +1.11 +1.05 −10.801974AJ.....79..866B 10.1086/111622 Radial velocity measurements of visual binaries. 1 The Astronomical Journal 79 866 1974 Bakos G. A. free +105.391 +62.841 20.8482 0.1452 +0.68105502 1 Peg A 1.60 0.18 11.89 0.15 4725 64 commas 63.5 0.3 1.21999A&AS..139..433D 10.1051/aas:1999401 A catalog of rotational and radial velocities for evolved stars Astronomy and Astrophysics Supplement Series 139 3 433 1999 De Medeiros J. R. Mayor M. astro-ph/0608248 Vizier catalog entry 2.592011A&A...525A..71W 10.1051/0004-6361/201015014 free 1009.1491 Coudé-feed stellar spectral library – atmospheric parameters Astronomy & Astrophysics 525 A71 2010 Wu Yue Singh H. P. Prugniel P. Gupta R. Koleva M. 53480665 +0.01 2.04 0.54 1 Peg +19°4691 804 203504 105502 8173 107073 J21221+1949A 29914 J21221+1948A 1 Peg 2019-04-10 1+Pegasi 1 Pegasi (1 Peg) is a triple star2008MNRAS.389..869E 10.1111/j.1365-2966.2008.13596.x 0806.2878 A catalogue of multiplicity among bright stellar systems Monthly Notices of the Royal Astronomical Society 389 2 869 2008 Eggleton P. P. Tokovinin A. A. free 14878976 Vizier catalog entry system in the constellation Pegasus, located approximately 156 light years away from the Sun based on parallax. It is visible to the naked eye as a faint, orange-hued star with an apparent visual magnitude of 4.09. The system is moving closer to the Earth with a heliocentric radial velocity of −11 km/s. The primary component is a giant with a stellar classification of K1III, a star that has exhausted the hydrogen supply at its core and evolved away from the main sequence. Estimated to be two billion years old, 1 Pegasi has 1.6 times the mass of the Sun and has expanded to twelve times the Sun's radius. The star is radiating 64 times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,725 K. There are several companions in addition to the primary. The brightest, component B, is a magnitude 9.3, K-type main-sequence star with a class of K0 V orbiting at an angular separation of 36.6" from the primary; it is itself a single-lined spectroscopic binary with an orbital period of 1111 ± 4 days years off out and eccentricity of 0.290 0.022.Spectroscopic binary orbits from photoelectric radial velocities. Paper 72: 1 Pegasi B Griffin R. F. The Observatory 107 1–5 February 1987 1987Obs...107....1G Visual companions C, with magnitude 12.9 and separation 64.7", and D, with magnitude 9.6 and separation 5.3", have been reported.2001AJ....122.3466M 10.1086/323920 The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog The Astronomical Journal 122 6 3466 2001 Mason Brian D. Wycoff Gary L. Hartkopf William I. Douglass Geoffrey G. Worley Charles E. free Vizier catalog entry 1 Pegasi is the brightest star in Pegasus that does not have a Bayer designation, although it is brighter than several stars in Pegasus that do such as τ, φ, and σ Pegasi, perhaps because it was included as the brightest star in the constellation Battery of Volta, made by Thomas Young. It is the first star numbered by Flamsteed in order of right ascension. In the 1795 French-language Fortin-Flamsteed edition of the Atlas Coelestis, 1 Pegasi is labelled with the letter "e".1795atce.book.....F Atlas celeste Paris: Delamarche Flamsteed John Fortin Jean Nicolas De Lalande Joseph Jerome Lefrancais 1795 References 1790202365373760256 2018AJ....155...30B Fundamental Parameters of 87 Stars from the Navy Precision Optical Interferometer Baines Ellyn K. Armstrong J. Thomas Schmitt Henrique R. Zavala R. T. Benson James A. Hutter Donald J. Tycner Christopher Van Belle Gerard T. The Astronomical Journal 2018 155 1 30 10.3847/1538-3881/aa9d8b 1712.08109 119427037 . free Category:K-type giants Category:Pegasus (constellation) BD+19 4691 Pegasi, 01 203504 105502 8173 Category:Population I stars