Context :

Aims : We demonstrate the feasibility of determining parallaxes for nearby objects with the Wide Field Camera on the United Kingdom Infrared Telescope ( UKIRT ) using the UKIRT Infrared Deep Sky Survey as a first epoch .
We determine physical parameters for ULAS J003402.77-005206.7 , one of the coolest brown dwarfs currently known , using atmospheric and evolutionary models with the distance found here .

Methods : Observations over the period 10/2005 to 07/2009 were pipeline processed at the Cambridge Astronomical Survey Unit and combined to produce a parallax and proper motion using standard procedures .

Results : We determined \pi = 79.6 \pm 3.8 mas , \mu _ { \alpha } = -20.0 \pm 3.7 mas/yr and \mu _ { \delta } = -363.8 \pm 4.3 mas/yr for ULAS J003402.77-005206.7 .

Conclusions : We have made a direct parallax determination for one of the coolest objects outside of the solar system .
The distance is consistent with a relatively young , 1 – 2 Gyr , low mass , 13 – 20 M _ { J } , cool , 550-600K , brown dwarf .
We present a measurement of the radial velocity that is consistent with an age between 0.5 and 4.0 Gyr .