We report the discovery of the wide L1.5+L4.5 binary 2MASS J15200224-4422419AB , identified during spectroscopic followup of high proper motion sources selected from the Two Micron All Sky Survey .
This source was independently identified by Kendall et al .
in the SuperCOSMOS Sky Survey .
Resolved JHK photometry and low resolution near-infrared spectroscopy demonstrate that this system is composed of two well-separated ( 1 \farcs 174 \pm 0 \farcs 016 ) L dwarfs .
Component classifications are derived using both spectral ratios and comparison to near-infrared spectra of previously classified field L dwarfs .
Physical association for the pair is deduced from the large ( \mu = 0 \farcs 73 \pm 0 \farcs 03 yr ^ { -1 } ) common proper motion of the components and their similar spectrophotometric distances ( 19 \pm 2 pc ) .
The projected separation of the binary , 22 \pm 2 AU , is consistent with maximum separation/total system mass trends for very low mass binaries .
The 2MASS J1520 - 4422 system exhibits both large tangential ( 66 \pm 7 km s ^ { -1 } ) and radial velocities ( -70 { \pm } 18 km s ^ { -1 } ) , and its motion in the local standard of rest suggests that it is an old member of the Galactic disk population .
This system joins a growing list of well-separated ( > 0 \farcs 5 ) , very low mass binaries , and is an excellent target for resolved optical spectroscopy to constrain its age as well as trace activity/rotation trends near the hydrogen-burning limit .