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We present Hubble Space Telescope (HST) near-infrared photometry of thecoldest known brown dwarf, WISE J085510.83$-$071442.5 (WISE 0855$-$0714). WISE0855$-$0714 was observed with the Wide Field Camera 3 (WFC3) aboard HST usingthe F105W, F125W, and F160W filters, which approximate the $Y$, $J$, and $H$near-infrared bands. WISE 0855$-$0714 is undetected at F105W with acorresponding 2$\sigma$ magnitude limit of $\sim$26.9. We marginally detectWISE 0855$-$0714 in the F125W images (S/N $\sim$4), with a measured magnitudeof 26.41 $\pm$ 0.27, more than a magnitude fainter than the $J-$band magnitudereported by Faherty and coworkers. WISE J0855$-$0714 is clearly detected in theF160W band, with a magnitude of 23.90 $\pm$ 0.02, the first secure detection ofWISE 0855$-$0714 in the near-infrared. Based on these data, we find that WISE0855$-$0714 has extremely red F105W$-$F125W and F125W$-$F160W colors relativeto other known Y dwarfs. We find that when compared to the models of Saumon etal. and Morley et al., the F105W$-$F125W and F125W$-$F160W colors of WISE0855$-$0714 cannot be accounted for simultaneously. These colors likelyindicate that we are seeing the collapse of flux on the Wien tail for thisextremely cold object.

The Collapse of the Wien Tail in the Coldest Brown Dwarf? Hubble Space Telescope Near-Infrared Photometry of WISE J085510.83-071442.5