observations were obtained at similar airmasses, and a small unceretainty from the parallax because the two observations were coincidentally obtained at closely matched times of the year. It is therefore our preferred proper motion measurement, and is consistent with the previous one. Table \[pm\] presents the resulting yearly motion and kinematic parameters.

   RA(.yr$^{-1}$)    DEC(.yr$^{-1}$)   RA(km.s$^{-1}$)   DEC(km.s$^{-1}$)
  ----------------- ----------------- ----------------- ------------------
   +0.17$\pm$0.016   -0.41$\pm$0.016         18                 46

  : Yearly proper motion for CFBDSIR1458. \[pm\]

The systematic errors induced by chromatic refraction and parallax effects are not corrected. The estimate of the absolute tangential velocity assumes a distance of 23pc.

Spectroscopic confirmation of a new ultracool brown dwarf
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[**Observations and reduction**]{}

After reduction and analysis of the March 7, data, an ESO Director Discretionary Time observation request was submitted on March 20, 2009 to obtain low-resolution NIR spectroscopy of CFBDSIR1458. This proposal for 4 hours of $H$-band observation, totalling 150 minutes of exposure on target, was accepted on April 22. The first observations were acquired on May 4, and the last on September 1, on average at high airmass, varying from 1.4 to more than 2.0.

The spectrum was extracted and calibrated using our own IDL procedures. The reduction proceeded as follows. The 