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Continued follow-up of WISEA J153429.75-104303.3, announced in Meisner et al(2020), has proven it to have an unusual set of properties. New imaging datafrom Keck/MOSFIRE and HST/WFC3 show that this object is one of the few faintproper motion sources known with J-ch2 > 8 mag, indicating a very coldtemperature consistent with the latest known Y dwarfs. Despite this, it hasW1-W2 and ch1-ch2 colors ~1.6 mag bluer than a typical Y dwarf. A newtrigonometric parallax measurement from a combination of WISE, Spitzer, and HSTastrometry confirms a nearby distance of $16.3^{+1.4}_{-1.2}$ pc and a largetransverse velocity of $207.4{\pm}15.9$ km/s. The absolute J, W2, and ch2magnitudes are in line with the coldest known Y dwarfs, despite the highlydiscrepant W1-W2 and ch1-ch2 colors. We explore possible reasons for the uniquetraits of this object and conclude that it is most likely an old, metal-poorbrown dwarf and possibly the first Y subdwarf. Given that the object has an HSTF110W magnitude of 24.7 mag, broad-band spectroscopy and photometry from JWSTare the best options for testing this hypothesis.

The Enigmatic Brown Dwarf WISEA J153429.75-104303.3 (aka "The Accident")