Riedel, AdricMurphy, SimonHenry, ToddMelis, CJao, Wei-ChunSubasavage, John2015-12-100004-6256http://hdl.handle.net/1885/50500We present the results of a multi-technique investigation of the M4.5Ve flare star AP Col, which we discover to be the nearest pre-main-sequence star. These include astrometric data from the CTIO 0.9 m, from which we derive a proper motion of 342.0 ± 0.5Author/s retain copyrightKeywords: astrometry; parallaxes; solar neighborhood; stars: low-mass; stars: pre-main sequence; techniques: spectroscopic201110.1088/0004-6256/142/4/1042016-02-24