The Wide-field Infrared Survey Explorer (WISE) spacecraft has been reactivated as NEOWISE-R to characterize and search for Near Earth Objects. The brown dwarf WISE J085510.83-071442.5 has now been reobserved by NEOWISE-R, and we confirm the results of Luhman (2014b), who found a very low effective temperature (≈250 K), a very high proper motion (8.1 +/- 0.1 arcsec/yr) , and a large parallax (454 +/- 45 mas). The large proper motion has separated the brown dwarf from the background sources that influenced the 2010 WISE data, allowing a measurement of a very red WISE color of W1-W2 >3.9 mag. A re-analysis of the 2010 WISE astrometry using only the W2 band, combined with the new NEOWISE-R 2014 position, gives an improved parallax of 448 +/- 33 mas and proper motion of 8.08 +/- 0.05\; arcsec/yr. These are all consistent with Luhman (2014b).
@article{arxiv.1405.7350,
title = {NEOWISE-R Observation of the Coolest Known Brown Dwarf},
author = {Edward L. Wright and Amy Mainzer and J. Davy Kirkpatrick and Frank Masci and Michael C. Cushing and James Bauer and Sergio Fajardo-Acosta and Christopher R. Gelino and Charles A. Beichman and M. F. Skrutskie and T. Grav and Peter R. M. Eisenhardt and Roc Cutri},
journal= {arXiv preprint arXiv:1405.7350},
year = {2015}
}