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Abstract We present follow-up Spitzer observations at 3.6 μ m (ch1) and 4.5 μ m (ch2) of CWISEP J144606.62–231717.8, one of the coldest known brown dwarfs in the solar neighborhood. This object was found by mining the Wide-field Infrared Survey Explorer ( WISE ) and NEOWISE data via the CatWISE Preliminary Catalog by Meisner et al., where an initial Spitzer color of ch1–ch2 = 3.71 ± 0.44 mag was reported, implying it could be one of the reddest, and hence coldest, known brown dwarfs. Additional Spitzer data presented here allows us to revise its color to ch1–ch2 = 2.986 ± 0.048 mag, which makes CWISEP J144606.62–231717.8 the fifth reddest brown dwarf ever observed. A preliminary trigonometric parallax measurement, based on a combination of WISE and Spitzer astrometry, places this object at a distance of pc. Based on our improved Spitzer color and preliminary parallax, CWISEP J144606.62–231717.8 has a T eff in the 310–360 K range. Assuming an age of 0.5–13 Gyr, this corresponds to a mass between 2 and 20 M Jup .
Marocco et al. (Thu,) studied this question.