== Cold Brown Dwarf WISEPC J0458+64 ==
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 . [[ http://adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011ApJ...726...30M&link_type=ARTICLE&db_key=AST&high= | THE FIRST ULTRA-COOL BROWN DWARF DISCOVERED BY THE WIDE-FIELD INFRARED SURVEY EXPLORER ]]
 . A. Mainzer (JPL) et al.
 . 600 K  
 . signal-to-noise ratio of ∼36 at 4.6 μm.
 . estimated distance of 6–10 pc. 
 .p6  what does "f,,MC,, = 0.34" mean?
 .p6  photometric distance of 9.0 ± 1.9 pc,  absolute magnitude M,,J,, = 17.7 ± 0.45
 . assume 8 pc
 . use http://www.calctool.org/CALC/phys/astronomy/star_magnitude, 17.7 -> 0.00000711214*383e24 W sun -> 2.72e21 W
 . bb 600K is 7350W/m^2^ emissivity=1 -> 170,000 km radius estimated
 . Sun is 696,340 km, Jupiter is 72,000 km radius