User:Primevalstar

SDSS J0104+15 (full designation SDSS J010448.46+153501.8) is the most metal-poor substellar object of the Galactic halo of the Milky Way located at a distance of 180–290 pc from the Sun. It was first discovered as an ultracool subdwarf from the Sloan Digital Sky Survey and UKIRT Infrared Deep Sky Survey data. Then it was identified as halo transitional brown dwarf based on observation with the Very Large Telescope and BT-Settl models. It has unsteady hydrogen fusion in its core and is in the substellar transition zone between very low-mass stars and electric-degenerate brown dwarfs. It has the lowest metallicity, which indicates it maybe the oldest brown dwarf by the time it was discovered. It is currently the most massive known brown dwarf.