# 19 Sextantis

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K-type giant star; Sextans

19 Sextantis Location of 19 Sex on the map (circled) Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) Constellation Sextans Right ascension 10h 12m 48.36462s[1] Declination +04° 36′ 52.8378″[1] Apparent magnitude (V) 5.78±0.01[2] Characteristics Evolutionary stage red giant branch[3] Spectral type K1 III[4] or K0 III[5] U−B color index +1.11[6] B−V color index +1.18[6] Astrometry Radial velocity (Rv) 31.80±0.21[7] km/s Proper motion (μ) RA: −50.538 mas/yr[1] Dec.: −6.118 mas/yr[1] Parallax (π) 6.3184±0.0625 mas[1] Distance 516 ± 5 ly (158 ± 2 pc) Details Mass 0.88+0.08 −0.03[3] M☉ Radius 23.13±1.17[8] R☉ Luminosity 241+4 −5[1] L☉ Temperature 4,576±123[9] K Metallicity [Fe/H] −0.53[10] dex Rotational velocity (v sin i) 2.5±0.8[4] km/s Age 7.94+1.83 −0.70[3] Gyr Other designations 19 Sex, 34 G. Sextantis[11], AG+04°1386, BD+05°2301, GC 14022, HD 88547, HIP 50027, HR 4004, SAO 118164, TIC 277696329[12] Database references SIMBAD data

**19 Sextantis** (**HD 88547; HR 4004; 34 G. Sextantis**), or simply **19 Sex**, is a solitary [star](/source/Star)[13] located in the [equatorial](/source/Celestial_equator) [constellation](/source/Constellation) [Sextans](/source/Sextans). It is faintly visible to the [naked eye](/source/Naked_eye) as an orange-hued point of light with an [apparent magnitude](/source/Apparent_magnitude) of 5.78.[2] [Gaia DR3](/source/Gaia_DR3) [parallax](/source/Parallax) measurements imply a distance of 516 [light-years](/source/Light-year)[1] and it is currently receding with a heliocentric [radial velocity](/source/Radial_velocity) of 31.8 [km/s](/source/Metre_per_second).[7] At its current distance, 19 Sex's brightness is diminished by an [interstellar extinction](/source/Interstellar_extinction) of 0.17 [magnitudes](/source/Magnitude_(astronomy)).[14]

19 Sex has a [stellar classification](/source/Stellar_classification) of K1 III,[4] indicating that it is an [evolved](/source/Stellar_evolution) [K-type](/source/K-type_star) [giant star](/source/Giant_star) that has ceased [hydrogen fusion](/source/Hydrogen_fusion) at it [core](/source/Stellar_core) and it has left the [main sequence](/source/Main_sequence). It has also been given a slightly hotter class of K0 III.[5] Stellar evolution models from Stock et al. (2018) model it to be a [red giant branch](/source/Red_giant_branch) star (100% chance)[3] that is currently fusing a [hydrogen](/source/Hydrogen) shell around an inert [helium](/source/Helium) core. It has 88% the [mass of the Sun](/source/Mass_of_the_Sun) but at the age of 7.94 [billion years](/source/Billion_years),[3] it has expanded to 23.13 times the [radius of the Sun](/source/Radius_of_the_Sun).[8] It radiates 241 times the [luminosity of the Sun](/source/Luminosity_of_the_Sun)[1] from its [photosphere](/source/Photosphere) at an [effective temperature](/source/Effective_temperature) of 4,576 [K](/source/Kelvin).[9] 19 Sex is metal deficient with an [iron](/source/Iron) abundance of [Fe/H] = −0.53 or 29.5% of the [Sun](/source/Sun)'s[10] and it spins modestly with a [projected rotational velocity](/source/Projected_rotational_velocity) of 2.5 [km/s](/source/Metre_per_second).[4]

## References

1. ^ [***a***](#cite_ref-GaiaDR3_1-0) [***b***](#cite_ref-GaiaDR3_1-1) [***c***](#cite_ref-GaiaDR3_1-2) [***d***](#cite_ref-GaiaDR3_1-3) [***e***](#cite_ref-GaiaDR3_1-4) [***f***](#cite_ref-GaiaDR3_1-5) [***g***](#cite_ref-GaiaDR3_1-6) Vallenari, A.; et al. (Gaia collaboration) (2023). ["*Gaia* Data Release 3. Summary of the content and survey properties"](https://doi.org/10.1051%2F0004-6361%2F202243940). *Astronomy and Astrophysics*. **674**: A1. [arXiv](/source/ArXiv_(identifier)):[2208.00211](https://arxiv.org/abs/2208.00211). [Bibcode](/source/Bibcode_(identifier)):[2023A&A...674A...1G](https://ui.adsabs.harvard.edu/abs/2023A&A...674A...1G). [doi](/source/Doi_(identifier)):[10.1051/0004-6361/202243940](https://doi.org/10.1051%2F0004-6361%2F202243940). [S2CID](/source/S2CID_(identifier)) [244398875](https://api.semanticscholar.org/CorpusID:244398875). [Gaia DR3 record for this source](https://vizier.cds.unistra.fr/viz-bin/VizieR-4?-source=+I%2F355&-from=nav&-nav=cat%3AI%2F355%26tab%3A%7BI%2F355%2Fgaiadr3%7D%26key%3Asource%3D1355%2Fgaiadr3%26HTTPPRM%3A%26-out.add%3D.%26Source%3D%3D%3D3860847570977164288%26-go+%25%23Sesame%23%25%26) at [VizieR](/source/VizieR).

1. ^ [***a***](#cite_ref-Tycho2000_2-0) [***b***](#cite_ref-Tycho2000_2-1) 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](/source/Bibcode_(identifier)):[2000A&A...355L..27H](https://ui.adsabs.harvard.edu/abs/2000A&A...355L..27H). [ISSN](/source/ISSN_(identifier)) [0004-6361](https://search.worldcat.org/issn/0004-6361). [S2CID](/source/S2CID_(identifier)) [17128864](https://api.semanticscholar.org/CorpusID:17128864).

1. ^ [***a***](#cite_ref-Stock2018_3-0) [***b***](#cite_ref-Stock2018_3-1) [***c***](#cite_ref-Stock2018_3-2) [***d***](#cite_ref-Stock2018_3-3) [***e***](#cite_ref-Stock2018_3-4) Stock, Stephan; Reffert, Sabine; Quirrenbach, Andreas (August 2018). ["Precise radial velocities of giant stars: X. Bayesian stellar parameters and evolutionary stages for 372 giant stars from the Lick planet search"](https://doi.org/10.1051%2F0004-6361%2F201833111). *Astronomy & Astrophysics*. **616**: A33. [arXiv](/source/ArXiv_(identifier)):[1805.04094](https://arxiv.org/abs/1805.04094). [Bibcode](/source/Bibcode_(identifier)):[2018A&A...616A..33S](https://ui.adsabs.harvard.edu/abs/2018A&A...616A..33S). [doi](/source/Doi_(identifier)):[10.1051/0004-6361/201833111](https://doi.org/10.1051%2F0004-6361%2F201833111). [ISSN](/source/ISSN_(identifier)) [0004-6361](https://search.worldcat.org/issn/0004-6361). [S2CID](/source/S2CID_(identifier)) [247657118](https://api.semanticscholar.org/CorpusID:247657118).

1. ^ [***a***](#cite_ref-Henry2000_4-0) [***b***](#cite_ref-Henry2000_4-1) [***c***](#cite_ref-Henry2000_4-2) [***d***](#cite_ref-Henry2000_4-3) Henry, Gregory W.; Fekel, Francis C.; Henry, Stephen M.; Hall, Douglas S. (September 2000). ["Photometric Variability in a Sample of 187 G and K Giants"](https://doi.org/10.1086%2F317346). *The Astrophysical Journal Supplement Series*. **130** (1): 201–225. [Bibcode](/source/Bibcode_(identifier)):[2000ApJS..130..201H](https://ui.adsabs.harvard.edu/abs/2000ApJS..130..201H). [doi](/source/Doi_(identifier)):[10.1086/317346](https://doi.org/10.1086%2F317346). [ISSN](/source/ISSN_(identifier)) [0067-0049](https://search.worldcat.org/issn/0067-0049).

1. ^ [***a***](#cite_ref-Adams1935_5-0) [***b***](#cite_ref-Adams1935_5-1) Adams, Walter S.; Joy, Alfred H.; Humason, Milton L.; Brayton, Ada Margaret (April 1935). ["The Spectroscopic Absolute Magnitudes and Parallaxes of 4179 Stars"](https://doi.org/10.1086%2F143628). *The Astrophysical Journal*. **81**: 187. [Bibcode](/source/Bibcode_(identifier)):[1935ApJ....81..187A](https://ui.adsabs.harvard.edu/abs/1935ApJ....81..187A). [doi](/source/Doi_(identifier)):[10.1086/143628](https://doi.org/10.1086%2F143628). [eISSN](/source/EISSN_(identifier)) [1538-4357](https://search.worldcat.org/issn/1538-4357). [ISSN](/source/ISSN_(identifier)) [0004-637X](https://search.worldcat.org/issn/0004-637X). [S2CID](/source/S2CID_(identifier)) [121056016](https://api.semanticscholar.org/CorpusID:121056016).

1. ^ [***a***](#cite_ref-Johnson1966_6-0) [***b***](#cite_ref-Johnson1966_6-1) 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](/source/Bibcode_(identifier)):[1966CoLPL...4...99J](https://ui.adsabs.harvard.edu/abs/1966CoLPL...4...99J).

1. ^ [***a***](#cite_ref-Famaey2005_7-0) [***b***](#cite_ref-Famaey2005_7-1) Famaey, B.; Jorissen, A.; Luri, X.; Mayor, M.; Udry, S.; Dejonghe, H.; Turon, C. (January 2005). ["Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data. Revisiting the concept of superclusters"](https://doi.org/10.1051%2F0004-6361%3A20041272). *Astronomy and Astrophysics*. **430**: 165. [arXiv](/source/ArXiv_(identifier)):[astro-ph/0409579](https://arxiv.org/abs/astro-ph/0409579). [Bibcode](/source/Bibcode_(identifier)):[2005A&A...430..165F](https://ui.adsabs.harvard.edu/abs/2005A&A...430..165F). [doi](/source/Doi_(identifier)):[10.1051/0004-6361:20041272](https://doi.org/10.1051%2F0004-6361%3A20041272). [S2CID](/source/S2CID_(identifier)) [17804304](https://api.semanticscholar.org/CorpusID:17804304).

1. ^ [***a***](#cite_ref-Kervella2004_8-0) [***b***](#cite_ref-Kervella2004_8-1) 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"](https://doi.org/10.1051%2F0004-6361%3A20035930). *Astronomy & Astrophysics*. **426** (1): 297–307. [arXiv](/source/ArXiv_(identifier)):[astro-ph/0404180](https://arxiv.org/abs/astro-ph/0404180). [Bibcode](/source/Bibcode_(identifier)):[2004A&A...426..297K](https://ui.adsabs.harvard.edu/abs/2004A&A...426..297K). [doi](/source/Doi_(identifier)):[10.1051/0004-6361:20035930](https://doi.org/10.1051%2F0004-6361%3A20035930). [eISSN](/source/EISSN_(identifier)) [1432-0746](https://search.worldcat.org/issn/1432-0746). [ISSN](/source/ISSN_(identifier)) [0004-6361](https://search.worldcat.org/issn/0004-6361). [S2CID](/source/S2CID_(identifier)) [6077801](https://api.semanticscholar.org/CorpusID:6077801).

1. ^ [***a***](#cite_ref-Stassun2019_9-0) [***b***](#cite_ref-Stassun2019_9-1) Stassun, Keivan G.; et al. (9 September 2019). ["The Revised *TESS* Input Catalog and Candidate Target List"](https://doi.org/10.3847%2F1538-3881%2Fab3467). *The Astronomical Journal*. **158** (4): 138. [arXiv](/source/ArXiv_(identifier)):[1905.10694](https://arxiv.org/abs/1905.10694). [Bibcode](/source/Bibcode_(identifier)):[2019AJ....158..138S](https://ui.adsabs.harvard.edu/abs/2019AJ....158..138S). [doi](/source/Doi_(identifier)):[10.3847/1538-3881/ab3467](https://doi.org/10.3847%2F1538-3881%2Fab3467). [eISSN](/source/EISSN_(identifier)) [1538-3881](https://search.worldcat.org/issn/1538-3881). [hdl](/source/Hdl_(identifier)):[1721.1/124721](https://hdl.handle.net/1721.1%2F124721). [S2CID](/source/S2CID_(identifier)) [166227927](https://api.semanticscholar.org/CorpusID:166227927).

1. ^ [***a***](#cite_ref-Hekker2007_10-0) [***b***](#cite_ref-Hekker2007_10-1) Hekker, S.; Meléndez, J. (December 2007). ["Precise radial velocities of giant stars: III. Spectroscopic stellar parameters"](https://doi.org/10.1051%2F0004-6361%3A20078233). *Astronomy & Astrophysics*. **475** (3): 1003–1009. [arXiv](/source/ArXiv_(identifier)):[0709.1145](https://arxiv.org/abs/0709.1145). [Bibcode](/source/Bibcode_(identifier)):[2007A&A...475.1003H](https://ui.adsabs.harvard.edu/abs/2007A&A...475.1003H). [doi](/source/Doi_(identifier)):[10.1051/0004-6361:20078233](https://doi.org/10.1051%2F0004-6361%3A20078233). [ISSN](/source/ISSN_(identifier)) [0004-6361](https://search.worldcat.org/issn/0004-6361). [S2CID](/source/S2CID_(identifier)) [10436552](https://api.semanticscholar.org/CorpusID:10436552).

1. **[^](#cite_ref-Gould1879_11-0)** 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](/source/Bibcode_(identifier)):[1879RNAO....1.....G](https://ui.adsabs.harvard.edu/abs/1879RNAO....1.....G).

1. **[^](#cite_ref-SIMBAD_12-0)** ["*19 Sex"](http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=%2A19+Sex). *[SIMBAD](/source/SIMBAD)*. [Centre de données astronomiques de Strasbourg](/source/Centre_de_donn%C3%A9es_astronomiques_de_Strasbourg). Retrieved January 13, 2024.

1. **[^](#cite_ref-Eggleton2008_13-0)** Eggleton, P. P.; Tokovinin, A. A. (11 September 2008). ["A catalogue of multiplicity among bright stellar systems"](https://doi.org/10.1111%2Fj.1365-2966.2008.13596.x). *Monthly Notices of the Royal Astronomical Society*. **389** (2): 869–879. [arXiv](/source/ArXiv_(identifier)):[0806.2878](https://arxiv.org/abs/0806.2878). [Bibcode](/source/Bibcode_(identifier)):[2008MNRAS.389..869E](https://ui.adsabs.harvard.edu/abs/2008MNRAS.389..869E). [doi](/source/Doi_(identifier)):[10.1111/j.1365-2966.2008.13596.x](https://doi.org/10.1111%2Fj.1365-2966.2008.13596.x). [eISSN](/source/EISSN_(identifier)) [1365-2966](https://search.worldcat.org/issn/1365-2966). [ISSN](/source/ISSN_(identifier)) [0035-8711](https://search.worldcat.org/issn/0035-8711). [S2CID](/source/S2CID_(identifier)) [14878976](https://api.semanticscholar.org/CorpusID:14878976).

1. **[^](#cite_ref-Gontcharov2017_14-0)** Gontcharov, George A.; Mosenkov, Aleksandr V. (28 September 2017). ["Verifying reddening and extinction for Gaia DR1 TGAS main sequence stars"](https://doi.org/10.1093%2Fmnras%2Fstx2219). *Monthly Notices of the Royal Astronomical Society*. **472** (4): 3805–3820. [arXiv](/source/ArXiv_(identifier)):[1709.01160](https://arxiv.org/abs/1709.01160). [Bibcode](/source/Bibcode_(identifier)):[2017MNRAS.472.3805G](https://ui.adsabs.harvard.edu/abs/2017MNRAS.472.3805G). [doi](/source/Doi_(identifier)):[10.1093/mnras/stx2219](https://doi.org/10.1093%2Fmnras%2Fstx2219). [eISSN](/source/EISSN_(identifier)) [1365-2966](https://search.worldcat.org/issn/1365-2966). [ISSN](/source/ISSN_(identifier)) [0035-8711](https://search.worldcat.org/issn/0035-8711). [S2CID](/source/S2CID_(identifier)) [118879856](https://api.semanticscholar.org/CorpusID:118879856).

v t e Constellation of Sextans COSMOS field List of stars in Sextans Sextans in Chinese astronomy Stars Bayer α β γ δ ε Flamsteed 7 18 19 23 24 25 35 41 Variable Y UY HR 3879 3915 4092 4233 HD 86081 (Bibhā) 92788 93396 Other BD−08°2823 Gliese 393 K2-239 LHS 292 PSR J0952−0607 TOI-561 WASP-43 (Gnomon) WASP-127 Exoplanets BD−08°2823 b c HD 86081 b (Santamasa) HD 92788 b KELT-11b TOI-561 b WASP-43b (Astrolábos) Galaxies NGC 2967 2974 2980 3007 3015 3018 3044 3110 3115 3156 3166 3169 3326 3341 3423 Other 3MM-1 AzTECC71 Baby Boom Galaxy CAPERS-LRD-z9 CID-42 CID-346 Cosmos Redshift 7 HD1 Infinity Galaxy J1000+0221 J1010+0612 J10405643–0103584 LAE J095950.99+021219.1 LBQS 1009−0252 MoM-z14 PG 1011−040 PG 1012+008 PGC 29820 PGC 3092152 PMN J0948+0022 REBELS-25 Sextans A Sextans B Sextans Dwarf Spheroidal Zhúlóng Galaxy clusters Abell 907 CL J1001+0220 Hyperion proto-supercluster Astronomical events AT 2018hyz SN 1000+0216 Category

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Adapted from the Wikipedia article [19 Sextantis](https://en.wikipedia.org/wiki/19_Sextantis) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/19_Sextantis?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.