NEOWISE-R Observation of the Coolest Known Brown Dwarf

November 2014 • 2014AJ....148...82W

Authors • Wright, Edward L. • Mainzer, Amy • Kirkpatrick, J. Davy • Masci, Frank • Cushing, Michael C. • Bauer, James • Fajardo-Acosta, Sergio • Gelino, Christopher R. • Beichman, Charles A. • Skrutskie, M. F. • Grav, T. • Eisenhardt, Peter R. M. • Cutri, Roc

Abstract • 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 re-observed by NEOWISE-R, and we confirm the results of Luhman, who found a very low effective temperature (≈250 K), a very high proper motion (8.''1 ± 0.''1 yr-1), 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 a proper motion of 8.''08 ± 0.''05 yr-1. These are all consistent with values from Luhman.


IPAC Authors

Roc Cutri

IPAC Deputy Director

Chris Gelino

Associate Scientist


Davy Kirkpatrick

Senior Scientist