  We report the discovery of LSR1826+3014, a very faint (V=19.36) star with a
very large proper motion (mu=2.38 arcsec/yr). A low resolution red spectrum
reveals that LSR1826+3014 is an ultra-cool red dwarf with spectral type M8.5 V
and with a radial velocity v_rad=+77+/-10 km/s. LSR1826+3014 is thus the
faintest red dwarf ever discovered with a proper motion larger than 2
arcsec/yr. Optical and infrared photometry suggest that the star is at a
distance d=13.9+/-3.5 pc from the Sun, which implies it is moving relative to
the local standard of rest with a total velocity of 175+/-25 km/s. Numerical
integration of its orbit suggests that LSR1826+3014 is on a halo-like galactic
orbit.
