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We present i and z photometry for 25 T dwarfs and one L dwarf. Combined withpublished photometry, the data show that the i - z, z - Y and z - J colors of Tdwarfs are very red, and continue to increase through to the late-type Tdwarfs, with a hint of a saturation for the latest types with T_eff ~ 600 K. Wepresent new 0.7-1.0 um and 2.8-4.2 um spectra for the very late-type T dwarfUGPS J072227.51-054031.2, as well as improved astrometry for this dwarf.Examination of the spectral energy distribution using the new and publisheddata, with Saumon & Marley models, shows that the dwarf has T_eff = 505 +/- 10K, a mass of 3-11 M_Jupiter and an age between 60 Myr and 1 Gyr. This young ageis consistent with the thin disk kinematics of the dwarf. The mass rangeoverlaps with that usually considered to be planetary, despite this being anunbound object discovered in the field near the Sun. This apparently youngrapid rotator is also undergoing vigorous atmospheric mixing, as determined bythe IRAC and WISE-2 4.5 um photometry and the Saumon & Marley models. Theoptical spectrum for this 500 K object shows clearly detected lines of theneutral alkalis Cs and Rb, which are emitted from deep atmospheric layers withtemperatures of 900-1200 K.

The Properties of the 500 K Dwarf UGPS J072227.51-054031.2, and a Study of the Far-Red Flux of Cold Brown Dwarfs