  I am using multi-epoch astrometry from the Wide-field Infrared Survey
Explorer (WISE) to search for new members of the solar neighborhood via their
high proper motions. Through this work, I have identified WISE
J104915.57-531906.1 as a high proper motion object and have found additional
detections in images from the Digitized Sky Survey, the Two Micron All-Sky
Survey, and the Deep Near-Infrared Survey of the Southern Sky. I have measured
a parallax of 0.496+/-0.037" (2.0+/-0.15 pc) from the astrometry in these
surveys, making WISE J104915.57-531906.1 the third closest system to the Sun.
During spectroscopic observations with GMOS at Gemini Observatory, an i-band
acquisition image resolved it as a 1.5" (3 AU) binary. A spectrum was collected
for the primary, which I classify as L8+/-1. The secondary is probably near the
L/T transition as well given that it is only modestly fainter than the primary
(delta i=0.45 mag).
