{{Short description|Galaxy in the constellation Sextans}} {{Infobox Galaxy | name = Sextans Dwarf Spheroidal | image = | epoch = J2000 | type = dSph<ref name="ned">{{cite web | title=NASA/IPAC Extragalactic Database | work=Results for Sextans Dwarf | url=http://nedwww.ipac.caltech.edu/ | accessdate=2006-11-29 }}</ref> | ra = {{RA|10|13|02.9}}<ref name="ned" /> | dec = {{DEC|-01|36|53}}<ref name="ned" /> | dist_ly = 290 ± 30 kly (90 ± 10 kpc)<ref name="karachentsevetal2004">{{cite journal | author=I. D. Karachentsev| author2=V. E. Karachentseva| author3=W. K. Hutchmeier| author4=D. I. Makarov | title=A Catalog of Neighboring Galaxies | journal=Astronomical Journal | date=2004 | volume=127 | issue=4 | pages=2031–2068 | bibcode=2004AJ....127.2031K | doi=10.1086/382905| doi-access=free }}</ref><ref name="Karachentsevetal2006">{{cite journal | author=Karachentsev, I. D.| author2=Kashibadze, O. G. | title=Masses of the local group and of the M81 group estimated from distortions in the local velocity field | journal=Astrophysics | date=2006 | volume=49 | issue=1 | pages=3–18 | bibcode=2006Ap.....49....3K | doi=10.1007/s10511-006-0002-6 | s2cid=120973010 }}</ref> | z = 224 ± 2 km/s<ref name="ned" /> | appmag_v = 10.4<ref name="ned" /> | size_v = 30.0{{prime}} × 12.0{{prime}}<ref name="ned" /> | constellation name = Sextans | notes = satellite galaxy of the Milky Way | names = Sextans I,<ref name="ned" /> LEDA 88608<ref name="ned" /> }}

The '''Sextans Dwarf Spheroidal''' is a dwarf spheroidal galaxy that was discovered in 1990 by Mike Irwin, Peter Bunclark, Mick Bridgeland and Richard McMahon as the 8th satellite of the Milky Way,<ref>{{cite journal|author=M. J. Irwin|author2=P. S. Bunclark|author3=M. T. Bridgeland|author4=R. G. McMahon|title=A new satellite galaxy of the Milky Way in the constellation of Sextans|journal=Monthly Notices of the Royal Astronomical Society|date=1990|volume=244|pages=16–19|bibcode=1990MNRAS.244P..16I}}</ref> located in the constellation of Sextans. It is also an elliptical galaxy, and displays a redshift because it is receding from the Sun at 224&nbsp;km/s (72&nbsp;km/s from the Galaxy). The distance to the galaxy is 320,000 light-years and the diameter is 8,400 light-years along its major axis.<ref>{{cite web | author = Hartmut Frommert | title = Sextans Dwarf | url = http://spider.seds.org/spider/LG/sex_dw.html | publisher = SEDS | accessdate = 2015-03-21}}</ref>

Like other dwarf spheroidal galaxies, the Sextans Dwarf's population consists of old, metal-poor stars: one study found that the majority of stars have a metallicity between [Fe/H] = −3.2 and −1.4. An analysis of several stars found them to also be deficient in barium, except for one star.<ref>{{cite journal|doi=10.1093/mnras/stab3189|arxiv=2110.09402|title=The formation of the Milky Way halo and its dwarf satellites: A NLTE–1D abundance analysis. V. The Sextans galaxy|year=2022|last1=Mashonkina|first1=L.|last2=Pakhomov|first2=Yu V.|last3=Sitnova|first3=T.|last4=Jablonka|first4=P.|last5=Yakovleva|first5=S. A.|last6=Belyaev|first6=A. K.|journal=Monthly Notices of the Royal Astronomical Society|volume=509|issue=3|pages=3626–3642|doi-access=free }}</ref>

==References== {{reflist}}

{{Sky|10|13|02.9|-|01|36|53|290000}} {{Milky Way}} {{Sextans}}

{{DEFAULTSORT:Galaxy, Sextans Dwarf Spheroidal}} Category:Dwarf spheroidal galaxies Category:Local Group Category:Milky Way Subgroup Category:Sextans ?