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The LOng Range Reconnaissance Imager (LORRI) is a panchromatic (360--910 nm),narrow-angle (field of view = 0.29 deg), high spatial resolution (pixel scale =1.02 arcsec) visible light imager used on NASA's New Horizons (NH) mission forboth science observations and optical navigation. Calibration observationsbegan several months after the NH launch on 2006 January 19 and have beenrepeated annually throughout the course of the mission, which is ongoing. Thispaper describes the in-flight LORRI calibration measurements, and the resultsderived from our analysis of the calibration data. LORRI has been remarkablystable over time with no detectable changes (at the 1% level) in sensitivity oroptical performance since launch. By employing 4 by 4 re-binning of the CCDpixels during read out, a special spacecraft tracking mode, exposure times of30 sec, and co-addition of approximately 100 images, LORRI can detectunresolved targets down to V = 22 (SNR=5). LORRI images have an instantaneousdynamic range of 3500, which combined with exposure time control ranging from0ms to 64,967 ms in 1ms steps supports high resolution, high sensitivityimaging of planetary targets spanning heliocentric distances from Jupiter todeep in the Kuiper belt, enabling a wide variety of scientific investigations.We describe here how to transform LORRI images from raw (engineering) unitsinto scientific (calibrated) units for both resolved and unresolved targets. Wealso describe various instrumental artifacts that could affect theinterpretation of LORRI images under some observing circumstances.

In-Flight Performance and Calibration of the LOng Range Reconnaissance Imager (LORRI) for the New Horizons Mission