Star in the constellation Pegasus
32 Pegasi Location of 32 Pegasi (circled)
Observation dataEpoch J2000 Equinox J2000 Constellation Pegasus Right ascension 22h 21m 19.33896s [ 1] Declination 28° 19′ 49.8786″[ 1] Apparent magnitude (V)4.81[ 2] (4.83 + 8.86) [ 3] Characteristics Spectral type B9III[ 4] U−Bcolor index −0.19[ 2] B−Vcolor index +0.00[ 2] Astrometry Radial velocity (Rv )+11.40[ 5] km/s Proper motion (μ)RA: +17.426[ 1] mas /yr Dec.: +7.122[ 1] mas /yr Parallax (π)5.7814± 0.3196 mas [ 1] Distance 560 ± 30 ly pc ) Absolute magnitude (MV )−1.82[ 6] Details 32 Peg Aa Luminosity 541[ 6] L ☉ Temperature 11,403[ 7] K Rotational velocity (v sin i )60[ 8] Other designations 32 Peg ,BD +27°4299GC 31253HD 212097HIP 110371HR 8522SAO 90440CCDM J22213+2820AFWDS J22213+2820Aa,Ab[ 9] Database references SIMBAD data
32 Pegasi is abinary star [ 10] constellation ofPegasus . It is visible to the naked eye as a faint, blue-white hued point of light with anapparent visual magnitude of 4.81[ 2] light years away from the Sun based onparallax , and is drifting further away with aradial velocity of +11.4 km/s.[ 5]
The brighter member of this system, designated component Aa, has visual magnitude 4.83 with astellar classification of B9III,[ 4] late B-type star with theluminosity class of agiant . It is spinning with aprojected rotational velocity of 60 km/s,[ 8] [ 6] luminosity of the Sun from itsphotosphere at aneffective temperature of 11,403 K.[ 7]
The fainter secondary, component Ab, is of magnitude 8.86 with anangular separation of″ position angle of 288° from the primary, as of 2005.Visual companions include component B, at a 70.7″ separation from the primary and magnitude 10.73; C, at a separation from B of 3.2″ and magnitude 12.4; as well as D (separation from A of 42.8″ and magnitude 11.9) and E (separation from A of 58.3" and magnitude 11.9).[ 3]
^a b c d e 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 atVizieR .^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 Mason, Brian D.; Wycoff, Gary L.; Hartkopf, William I.; Douglass, Geoffrey G.; Worley, Charles E. (2001)."The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog" .The Astronomical Journal .122 (6): 3466.Bibcode :2001AJ....122.3466M .doi :10.1086/323920 Vizier catalog entry ^a b Hoffleit, D.; Warren, W. H. (1995). "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 .Bibcode :1995yCat.5050....0H . ^a b 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 . ^a b c 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 Paunzen, E.; Schnell, A.; Maitzen, H. M. (2005). "An empirical temperature calibration for the Δa photometric system".Astronomy and Astrophysics .444 (3): 941.arXiv :astro-ph/0509049 Bibcode :2005A&A...444..941P .doi :10.1051/0004-6361:20053546 .S2CID 119436374 . ^a b Abt, Helmut A.; Levato, Hugo; Grosso, Monica (2002)."Rotational Velocities of B Stars" .The Astrophysical Journal .573 (1):359– 365.Bibcode :2002ApJ...573..359A .doi :10.1086/340590 ^ "32 Peg" .SIMBAD Centre de données astronomiques de Strasbourg . Retrieved2019-07-01 .^ 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 . Vizier catalog entry
