CWISEP J193518.59-154620.3: An Extremely Cold Brown Dwarf in the Solar Neighborhood Discovered with CatWISE

Federico Marocco, Dan Caselden, Aaron M. Meisner, J. Davy Kirkpatrick, Edward L. Wright, Jacqueline K. Faherty, Christopher R. Gelino, Peter R.M. Eisenhardt, John W. Fowler, Michael C. Cushing, Roc M. Cutri, Nelson Garcia, Thomas H. Jarrett, Renata Koontz, Amanda Mainzer, Elijah J. Marchese, Bahram Mobasher, David J. Schlegel, Daniel Stern, Harry I. Teplitz

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20 Scopus citations


We present the discovery of an extremely cold, nearby brown dwarf in the solar neighborhood, found in the CatWISE catalog. Photometric follow-up with Spitzer reveals that the object, CWISEP J193518.59-154620.3, has ch1-ch2 = 3.24 ±0.31 mag, making it one of the reddest brown dwarfs known. Using the Spitzer photometry and the polynomial relations from Kirkpatrick et al. we estimate an effective temperature in the ∼270-360 K range, and a distance estimate in the 5.6-10.9 pc range. We combined the WISE, NEOWISE, and Spitzer data to measure a proper motion of mas yr-1, μ δ = -50 ±97 mas yr-1, which implies a relatively low tangential velocity in the range 7-22 km s-1.

Original languageEnglish (US)
Article number17
JournalAstrophysical Journal
Issue number1
StatePublished - Aug 10 2019
Externally publishedYes


  • brown dwarfs
  • infrared: stars
  • proper motions
  • solar neighborhood

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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