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We present the discovery of a very cold, very low mass, nearby brown dwarfusing data from the NASA Wide-field Infrared Survey Explorer (WISE). Theobject, WISE J064723.23-623235.5, has a very red WISE color of W1-W2 > 3.77 magand a very red Spitzer Space Telescope color of ch1-ch2 = 2.82+/-0.09 mag. InJ_MKO-ch2 color (7.58+/-0.27 mag) it is one of the two or three reddest browndwarfs known. Our grism spectrum from the Hubble Space Telescope (HST) confirmsit to be the seventeenth Y dwarf discovered, and its spectral type of Y1+/-0.5makes it one of the four latest-type Y dwarfs classified. Astrometric imagingfrom Spitzer and HST, combined with data from WISE, provides a preliminaryparallax of pi = 115+/-12 mas (d = 8.7+/-0.9 pc) and proper motion of mu =387+/-25 mas/yr based on 2.5 years of monitoring. The spectrum implies a blueJ-H color, for which model atmosphere calculations suggest a relatively lowsurface gravity. The best fit to these models indicates an effectivetemperature of 350-400K and a mass of ~5-30 M_Jup. Kinematic analysis hintsthat this object may belong to the Columba moving group, which would support anage of ~30 Myr and thus an even lower mass of <2 M_Jup, but verification wouldrequire a radial velocity measurement not currently possible for a J=22.7 magbrown dwarf.

Discovery of the Y1 Dwarf WISE J064723.23-623235.5