Hydrus I

Hydrus 1 is an ultra-faint Milky Way satellite located between the Large and Small Magellanic Clouds. It possesses an old, metal-poor stellar population, including BHB stars and RR-Lyrae. With an elliptical shape and ambiguous properties between extended globular clusters and dwarf galaxies, Hydrus 1 exhibits a dark matter-dominated mass-to-light ratio and a potential line-of-sight velocity gradient, suggesting a tentative rotation. Plausibly part of the Magellanic family, it may be a debris of the LMC, stripped 0.1 to 0.5 Gyr ago. Its proximity to the Sun makes it an excellent target for dark matter annihilation searches. Chemically, it is metal-poor with self-enrichment and hosts one of the most carbon-enhanced stars known.