The LOng-Range Reconnaissance Imager (LORRI) is a high resolution imaging instrument on the New Horizons
spacecraft. New Horizons will collect data during a fly-by of Pluto and its satellites in 2015, and may continue on to
collect data at another Kuiper Belt Object in an extended mission phase. New Horizons launched on January 19, 2006,
the first mission of NASA's New Frontiers program. LORRI is a narrow field of view (0.29°), Ritchey-Chrétien
telescope with a 20.8 cm diameter primary mirror. The telescope has an effective focal length of 262 cm and has a three
lens field flattener near the focal plane. The focal plane unit consists of a 1024 × 1024 pixel charge-coupled device
detector operating in frame transfer mode. LORRI provides panchromatic imaging over a bandpass that extends
approximately from 350 nm to 850 nm. The instrument operates in an extreme thermal environment, viewing space
from within the warm spacecraft. For this reason, LORRI has a silicon carbide optical system with passive thermal
control, designed to maintain focus without adjustment over a wide temperature range from -100 C to +50 C.
LORRI has been successfully operated through initial commissioning, a fly-by of Jupiter, and two annual checkout
periods. We describe the in-flight testing and measured performance of LORRI, and provide comparisons to pre-launch
performance predictions. We also detail plans under consideration for changing LORRI's flight software to
accommodate autonomous detection of targets within the instrument's field of view.