Star in the constellation of Octans
HD 210056 , also known asHR 8432 , is a solitary orange huedstar located in the southerncircumpolar constellation Octans . Eggen (1993) listed it as a member of the old disk population.[ 12]
The object has anapparent magnitude of 6.13,[ 2] naked eye . Based onparallax measurements from theGaia satellite , the object is estimated to be 292light years distant.[ 1] radial velocity ofkm/s [ 5] magnitudes due to interstellar dust. It has anabsolute magnitude of +1.41.[ 13]
This is an evolvedgiant star with astellar classification of K0 III. It has 1.59 times themass of the Sun but has expanded to 7.72 times itsgirth .[ 7] luminosity of the Sun from its enlargedphotosphere at aneffective temperature ofK [ 7] asteroseismologic measurements, HD 210056 is estimated to be 2billion years old.[ 9] Sun 'smetallicity — whatastronomers define a star's abundance ofchemical elements heavier thanhelium .[ 7] projected rotational velocity lower thankm/s [ 9]
^a b c d Vallenari, A.; et al. (Gaia collaboration) (2023)."Gaia Data Release 3. Summary of the content and survey properties" .Astronomy and Astrophysics .674 : A1.arXiv :2208.00211 Bibcode :2023A&A...674A...1G .doi :10.1051/0004-6361/202243940 S2CID 244398875 . Gaia DR3 record for this source atVizieR .^a b Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars".Astronomy and Astrophysics .355 :L27 – L30 .Bibcode :2000A&A...355L..27H .ISSN 0004-6361 . ^ Houk, N.; Cowley, A. P. (1975).University of Michigan Catalogue of two-dimensional spectral types for the HD stars. Volume I. Declinations −90° to −53° .Bibcode :1975mcts.book.....H . ^a b Johnson, H. L.; Mitchell, R. I.; Iriarte, B.; Wisniewski, W. Z. (1966). "UBVRIJKL Photometry of the Bright Stars".Communications of the Lunar and Planetary Laboratory .4 :99– 110.Bibcode :1966CoLPL...4...99J . ^a b Gontcharov, G. A. (November 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 .eISSN 1562-6873 .ISSN 1063-7737 .S2CID 119231169 . ^ Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation".Astronomy Letters .38 (5):331– 346.arXiv :1108.4971 Bibcode :2012AstL...38..331A .doi :10.1134/S1063773712050015 .eISSN 1562-6873 .ISSN 1063-7737 .S2CID 119257644 . ^a b c d Ottoni, G.; Udry, S.; Ségransan, D.; Buldgen, G.; Lovis, C.; Eggenberger, P.; Pezzotti, C.; Adibekyan, V.; Marmier, M.; Mayor, M.; Santos, N. C.; Sousa, S. G.; Lagarde, N.; Charbonnel, C. (January 2022)."CORALIE radial-velocity search for companions around evolved stars (CASCADES): I. Sample definition and first results: Three new planets orbiting giant stars" .Astronomy & Astrophysics .657 : A87.arXiv :2201.01528 Bibcode :2022A&A...657A..87O .doi :10.1051/0004-6361/202040078 eISSN 1432-0746 .ISSN 0004-6361 . ^ De Medeiros, J. R.; Alves, S.; Udry, S.; Andersen, J.; Nordström, B.; Mayor, M. (January 2014)."A catalog of rotational and radial velocities for evolved stars" .Astronomy & Astrophysics .561 : A126.arXiv :1312.3474 Bibcode :2014A&A...561A.126D .doi :10.1051/0004-6361/201220762 eISSN 1432-0746 .ISSN 0004-6361 . ^a b c Aguirre, Víctor Silva; et al. (29 January 2020)."Detection and Characterization of Oscillating Red Giants: First Results from theTESS Satellite" .The Astrophysical Journal .889 (2): L34.arXiv :1912.07604 Bibcode :2020ApJ...889L..34S .doi :10.3847/2041-8213/ab6443 eISSN 2041-8213 . ^ Gould, Benjamin Apthorp (1878). "Uranometria Argentina : brillantez y posicion de las estrellas fijas, hasta la septima magnitud, comprendidas dentro de cien grados del polo austral : con atlas".Resultados del Observatorio Nacional Argentino .1 .Bibcode :1879RNAO....1.....G . ^ "HD 210056" .SIMBAD Centre de données astronomiques de Strasbourg . RetrievedNovember 21, 2022 .^ Eggen, O. J. (July 1993)."Evolved GK stars near the sun. I - The old disk population" .The Astronomical Journal .106 : 80.Bibcode :1993AJ....106...80E .doi :10.1086/116622 ^ Gontcharov, George A.; Mosenkov, Aleksandr V. (28 September 2017)."Verifying reddening and extinction for Gaia DR1 TGAS main sequence stars" .Monthly Notices of the Royal Astronomical Society .472 (4):3805– 3820.arXiv :1709.01160 Bibcode :2017MNRAS.472.3805G .doi :10.1093/mnras/stx2219 eISSN 1365-2966 .ISSN 0035-8711 .
