19 Sextantis

K-type giant star; Sextans 19 Sextantis Sextans constellation map.svg center 260 right Red circle.svg 6 19 Sextantis 490 334 Location of 19 Sex on the map (circled) J2000.0 (ICRS) Sextans 10 12 48.36462 +04 36 52.8378 5.780.01 red giant branch K1 III or K0 III +1.18 +1.11 31.800.21 6.3184 0.0625 −50.538 −6.118 0.880.08 0.03 23.131.17 2414 5 4,576123 −0.53 2.50.8 7.941.83 0.70 19 Sex 34 G. Sextantis +04°1386 +05°2301 14022 88547 50027 4004 118164 277696329 *19+Sex 19 Sextantis (HD 88547; HR 4004; 34 G. Sextantis), or simply 19 Sex, is a solitary star located in the equatorial constellation Sextans. It is faintly visible to the naked eye as an orange-hued point of light with an apparent magnitude of 5.78. Gaia DR3 parallax measurements imply a distance of 516 light-years and it is currently receding with a heliocentric radial velocity of 31.8 km/s. At its current distance, 19 Sex's brightness is diminished by an interstellar extinction of 0.17 magnitudes. 19 Sex has a stellar classification of K1 III, indicating that it is an evolved K-type giant star that has ceased hydrogen fusion at it core and it has left the main sequence. It has also been given a slightly hotter class of K0 III. Stellar evolution models from Stock et al. (2018) model it to be a red giant branch star (100% chance) that is currently fusing a hydrogen shell around an inert helium core. It has 88% the mass of the Sun but at the age of 7.94 billion years, it has expanded to 23.13 times the radius of the Sun. It radiates 241 times the luminosity of the Sun from its photosphere at an effective temperature of 4576 K commas. 19 Sex is metal deficient with an iron abundance of [Fe/H] = −0.53 or 29.5% of the Sun's and it spins modestly with a projected rotational velocity of 2.5 km/s. References 3860847570977164288 Høg E. Fabricius C. Makarov V. V. Urban S. Corbin T. 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Spectroscopic stellar parameters Astronomy & Astrophysics December 2007 475 3 1003–1009 10.1051/0004-6361:20078233 0004-6361 10436552 2007A&A...475.1003H 0709.1145 free *19 Sex January 13, 2024 Gould Benjamin Apthorp 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 1879RNAO....1.....G 1878 Eggleton P. P. Tokovinin A. A. A catalogue of multiplicity among bright stellar systems Monthly Notices of the Royal Astronomical Society 11 September 2008 389 2 869–879 0035-8711 1365-2966 10.1111/j.1365-2966.2008.13596.x 2008MNRAS.389..869E 0806.2878 14878976 free Gontcharov George A. Mosenkov Aleksandr V. Verifying reddening and extinction for Gaia DR1 TGAS main sequence stars Monthly Notices of the Royal Astronomical Society 28 September 2017 472 4 3805–3820 0035-8711 1365-2966 10.1093/mnras/stx2219 2017MNRAS.472.3805G 1709.01160 118879856 free Category:K1III stars Category:Sextans Sextantis, 19 Sextantis, 34 BD+05 02301 088547 050027 4004