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Sextans Dwarf Spheroidal
Observation data (J2000 epoch)
Constellation	Sextans
Right ascension	10 13 02.9
Declination	−01° 36′ 53″
Redshift	224 ± 2 km/s
Distance	290 ± 30 kly (90 ± 10 kpc)
Apparent magnitude (V)	10.4
Characteristics
Type	dSph
Apparent size (V)	30.0′ × 12.0′
Notable features	satellite galaxy of the Milky Way
Other designations
Sextans I, LEDA 88608

The Sextans Dwarf Spheroidal is a dwarf spheroidal galaxy that was discovered in 1990 by Mike Irwin as the 8th satellite of the Milky Way, 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 km/s (72 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.

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 = −3.2 and −1.4. An analysis of several stars found them to also be deficient in barium, except for one star.

References

1. ^ "NASA/IPAC Extragalactic Database". Results for Sextans Dwarf. Retrieved 2006-11-29.
2. I. D. Karachentsev; V. E. Karachentseva; W. K. Hutchmeier; D. I. Makarov (2004). "A Catalog of Neighboring Galaxies". Astronomical Journal. 127 (4): 2031–2068. Bibcode:2004AJ....127.2031K. doi:10.1086/382905.
3. Karachentsev, I. D.; Kashibadze, O. G. (2006). "Masses of the local group and of the M81 group estimated from distortions in the local velocity field". Astrophysics. 49 (1): 3–18. Bibcode:2006Ap.....49....3K. doi:10.1007/s10511-006-0002-6. S2CID 120973010.
4. M. J. Irwin; P. S. Bunclark; M. T. Bridgeland; R. G. McMahon (1990). "A new satellite galaxy of the Milky Way in the constellation of Sextans". Monthly Notices of the Royal Astronomical Society. 244: 16–19. Bibcode:1990MNRAS.244P..16I.
5. Hartmut Frommert. "Sextans Dwarf". SEDS. Retrieved 2015-03-21.
6. Mashonkina, L.; Pakhomov, Yu V.; Sitnova, T.; Jablonka, P.; Yakovleva, S. A.; Belyaev, A. K. (2022). "The formation of the Milky Way halo and its dwarf satellites: A NLTE–1D abundance analysis. V. The Sextans galaxy". Monthly Notices of the Royal Astronomical Society. 509 (3): 3626–3642. arXiv:2110.09402. doi:10.1093/mnras/stab3189.

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Related	Alternate names Andromeda–Milky Way collision Baade's Window In mythology Zone of Avoidance
Astronomy portal Category

v t e Constellation of Sextans
List of stars in Sextans Sextans in Chinese astronomy
Stars	Bayer α β γ δ ε Flamsteed 3 4 5 6 7 9 12 13 14 16 17 18 19 20 21 23 24 25 26 27 31 32 33 34 35 36 39 40 41 Variable S T Y RW SW VY HR 3879 3901 3907 3915 3959 4000 4034 4059 4060 4085 4092 4109 4122 4224 4233 4240 HD 85461 86081 86341 90057 92788 93396 Other BD−08°2823 FIRST J102347.6+003841 Gliese 382 Gliese 393 LHS 292 PG 1026+002 PG 1047+003 PSR J0952–0607 TOI-561 WASP-43
Exoplanets BD-08°2823 b c HD 86081 b HD 92788 b KELT-11b WASP-43b TOI-561 b
Galaxies	NGC 2974 3044 3110 3115 3156 3169 3341 Other Baby Boom Galaxy CID-42 Cosmos Redshift 7 HD1 LAE J095950.99+021219.1 PGC 29820 REBELS-25 Sextans A Sextans B Sextans Dwarf Spheroidal AT2018hyz
Galaxy clusters CL J1001+0220 Hyperion proto-supercluster
Category

• Dwarf spheroidal galaxies
• Local Group
• Milky Way Subgroup
• Sextans
• Astronomical objects discovered in 1990