Suspected variable star; Sextans
HD 90362Location of HD 90362 on the map (circled)
Observation dataEpoch J2000.0 Equinox J2000.0 (ICRS ) Constellation Sextans Right ascension 10h 25m 44.27091s [ 1] Declination −07° 03′ 35.3764″[ 1] Apparent magnitude (V)5.56[ 2] Characteristics Evolutionary stage AGB [ 3] Spectral type K6 III Fe −0.5[ 4] U−Bcolor index +1.86[ 2] B−Vcolor index +1.53[ 2] Variable type suspected[ 5] Astrometry Radial velocity (Rv )35.60± 0.25[ 6] km/s Proper motion (μ)RA: −135.763mas /yr [ 1] Dec.: +130.341mas /yr [ 1] Parallax (π)7.127± 0.1702 mas [ 1] Distance 460 ± 10 ly pc ) Absolute magnitude (MV )+0.19[ 7] Details Mass 0.44± 0.14[ 8] M ☉ Radius 41.1± 2.1[ 9] R ☉ Luminosity 252± 9[ 10] L ☉ Surface gravity (log g )0.96+0.02 −0.03 [ 11] cgs Temperature 3,804[ 12] K Metallicity −0.10± 0.05[ 8] dex Rotational velocity (v sin i )1.5± 1.0[ 13] Age 11.0+1.9 −1.6 [ 8] Gyr Other designations 47 G. Sextantis [ 14] NSV 18399BD −06°3146FK5 2836GC 14321HD 90362HIP 51046HR 4092SAO 137557CCDM J10258-0704AWDS J10257-0704ATIC 36881111[ 15] Database references SIMBAD data
HD 90362 (HR 4092; 47 G. Sextantis ) is a solitarystar [ 16] equatorial constellation Sextans . It is faintly visible to thenaked eye as a redish-orange-hued point of light with anapparent magnitude of 5.56.[ 2] Gaia DR3 parallax measurements imply a distance of approximately 460light-years [ 1] radial velocity ofkm/s [ 6] interstellar extinction of 0.19magnitudes [ 17] absolute magnitude of +0.19.[ 7]
HD 90362 is an oldpopulation II star [ 18] stellar classification of K6 III Fe −0.5,[ 4] evolved K-type giant that has exhaustedhydrogen at itscore and left themain sequence along with a mild spectral underabundance ofiron . It is currently on theasymptotic giant branch , generating energy via the fusion of hydrogen andhelium shells around an inertcarbon core.[ 3] mass of the Sun [ 8] billion years ,[ 8] radius of the Sun .[ 9] luminosity of the Sun [ 10] photosphere at aneffective temperature ofK [ 12] Sun 's[ 8] projected rotational velocity of approximatelykm/s [ 13]
The variability of the star was first detected in 1997 by theHipparcos mission.[ 19] Hipparcos passband . As of 2004, its variability has not been confirmed.[ 20] position angle of 100° as of 2010.[ 21] [ 21]
^a b c d e 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 c d 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 Eggen, Olin J. (July 1992)."Asymptotic giant branch stars near the sun" .The Astronomical Journal .104 : 275.Bibcode :1992AJ....104..275E .doi :10.1086/116239 ISSN 0004-6256 .S2CID 121672252 . ^a b Keenan, Philip C.; McNeil, Raymond C. (October 1989)."The Perkins catalog of revised MK types for the cooler stars" .The Astrophysical Journal Supplement Series .71 : 245.Bibcode :1989ApJS...71..245K .doi :10.1086/191373 eISSN 1538-4365 .ISSN 0067-0049 . ^ Samus', N. N.; Kazarovets, E. V.; Durlevich, O. V.; Kireeva, N. N.; Pastukhova, E. N. (January 2017). "General catalogue of variable stars: Version GCVS 5.1".Astronomy Reports .61 (1):80– 88.Bibcode :2017ARep...61...80S .doi :10.1134/S1063772917010085 .eISSN 1562-6881 .ISSN 1063-7729 .S2CID 125853869 . ^a b Famaey, B.; Pourbaix, D.; Frankowski, A.; Van Eck, S.; Mayor, M.; Udry, S.; Jorissen, A. (18 February 2009)."Spectroscopic binaries among Hipparcos M giants" .Astronomy & Astrophysics .498 (2):627– 640.arXiv :0901.0934 Bibcode :2009A&A...498..627F .doi :10.1051/0004-6361/200810698 eISSN 1432-0746 .ISSN 0004-6361 . ^a b 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 e f Feuillet, Diane K.; Bovy, Jo; Holtzman, Jon; Girardi, Léo; MacDonald, Nick; Majewski, Steven R.; Nidever, David L. (20 January 2016)."Determining Ages of APOGEE Giants with Known Distances" .The Astrophysical Journal .817 (1): 40.arXiv :1511.04088 Bibcode :2016ApJ...817...40F .doi :10.3847/0004-637X/817/1/40 eISSN 1538-4357 .S2CID 118675933 . ^a b Kervella, P.; Thévenin, F.; Di Folco, E.; Ségransan, D. (April 8, 2004)."The angular sizes of dwarf stars and subgiants: Surface brightness relations calibrated by interferometry" .Astronomy & Astrophysics .426 (1):297– 307.arXiv :astro-ph/0404180 Bibcode :2004A&A...426..297K .doi :10.1051/0004-6361:20035930 eISSN 1432-0746 .ISSN 0004-6361 .S2CID 6077801 . ^a b 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 .^ Poggio, E.; Recio-Blanco, A.; Palicio, P. A.; Re Fiorentin, P.; de Laverny, P.; Drimmel, R.; Kordopatis, G.; Lattanzi, M. G.; Schultheis, M.; Spagna, A.; Spitoni, E. (30 September 2022)."The chemical signature of the Galactic spiral arms revealed byGaia DR3" .Astronomy & Astrophysics .666 : L4.arXiv :2206.14849 Bibcode :2022A&A...666L...4P .doi :10.1051/0004-6361/202244361 eISSN 1432-0746 .ISSN 0004-6361 . ^a b Ting, Yuan-Sen; Conroy, Charlie; Rix, Hans-Walter; Cargile, Phillip (July 8, 2019)."The Payne : Self-consistent ab initio Fitting of Stellar Spectra" .The Astrophysical Journal .879 (2): 69.arXiv :1804.01530 Bibcode :2019ApJ...879...69T .doi :10.3847/1538-4357/ab2331 ISSN 1538-4357 .S2CID 54588218 . ^a b De Medeiros, J. R.; Alves, S.; Udry, S.; Andersen, J.; Nordström, B.; Mayor, M. 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(11 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 eISSN 1365-2966 .ISSN 0035-8711 .S2CID 14878976 . ^ 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 .S2CID 118879856 . ^ Cacciari, C.; Malagnini, M. L.; Morossi, C.; Rossi, L. (September 1987). "Physical parameters for Population II stars".Astronomy and Astrophysics .183 :314– 318.Bibcode :1987A&A...183..314C .ISSN 0004-6361 .S2CID 117292711 . ^ Perryman, M. A. C.; Lindegren, L.; Kovalevsky, J.; Hoeg, E.; Bastian, U.; Bernacca, P. L.; Crézé, M.; Donati, F.; Grenon, M.; Grewing, M.; van Leeuwen, F. (July 1997). "The HIPPARCOS Catalogue".Astronomy and Astrophysics .323 :L49 – L52 .Bibcode :1997A&A...323L..49P .ISSN 0004-6361 . ^ Samus, N. N.; Durlevich, O. V. (November 2004). "VizieR Online Data Catalog: Combined General Catalogue of Variable Stars (Samus+ 2004)".VizieR Online Data Catalog : II/250.Bibcode :2004yCat.2250....0S . ^a b Mason, Brian D.; Wycoff, Gary L.; Hartkopf, William I.; Douglass, Geoffrey G.; Worley, Charles E. (December 2001)."The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog" .The Astronomical Journal .122 (6):3466– 3471.Bibcode :2001AJ....122.3466M .doi :10.1086/323920 ISSN 0004-6256 .S2CID 119533755 .
