NEOWISE-R observation of the coolest known brown dwarf

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

Research output: Contribution to journalArticlepeer-review

28 Scopus citations


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.

Original languageEnglish (US)
Article number82
JournalAstronomical Journal
Issue number5
StatePublished - Nov 1 2014
Externally publishedYes


  • astrometry
  • brown dwarfs
  • infrared: stars
  • solar neighborhood
  • stars: individual (WISE J085510.83-071442.5)
  • stars: low-mass

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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