WISE J2209+2711

WISE J2209+2711 (WISE J220905.73+271143.9) is a brown dwarf of spectral type Y0:, located in constellation Pegasus at 22 light-years from Earth. Its discovery was published in 2014 by Cushing et al.

Physical properties
WISE J2209+2711 is one of a few Y-dwarfs observed with JWST NIRSpec and MIRI. The modelling re-produced the spectrum with an excellent fit using phosphine-free and diabatic models. The excellent fit was achieved with a model that used an effective temperature of 350 K and a surface gravity of 4.0. This corresponds to a 5 object with an age of 800 Myrs.