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 the NIRSpec and MIRI instruments aboard the James Webb Space Telescope. 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 and a surface gravity of . This corresponds to a 5 object with an age of 800 Myr. An atmospherical retrieval of WISE J2209+1711's spectral energy distribution, collected by JWST's NIRSpec and MIRI instruments, derive a mass of , a radius of , an effective temperature of and a surface gravity of . The position of WISE J2209+2711 in the surface gravity-temperature diagram indicates an age close to two Gyr.
See also List of star systems within 20–25 light years List of Y-dwarfs
References