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5 August 2010Stray light performance of the long range reconnaissance imager (LORRI) on the New Horizons Mission
The LOng-Range Reconnaissance Imager (LORRI) is the high resolution imager for the New Horizons mission to the
Pluto system and the Kuiper Belt, which is the vast region of icy bodies extending roughly from 30 to 50 astronomical
units (AU). LORRI is a monolithic SiC, Ritchey-Chrétien telescope with a 20.8 cm diameter primary mirror and with an
0.29° field of view. The detector is a thinned, backside-illuminated charge-coupled device (CCD) operated in frame
transfer mode to obtain 1024 × 1024 pixel, panchromatic images over a bandpass of approximately 350 nm to 850 nm
with 4.96 μrad pixels. LORRI operated successfully at the New Horizons Jupiter encounter in Feb-Mar 2007 and made
challenging observations of faint sources, such as the Jovian rings within a few degrees of sunlit Jupiter and the
nightside of Io illuminated by Jupiter shine. Ambitious observations are planned at Pluto encounter including some with
LORRI pointed within 15° of the Sun. A unique program of inflight calibrations has measured LORRI's stray light
rejection using Jupiter and the Sun. The measured point source transmittance (PST) function for LORRI decreases from
145 on axis to 4×10-10 at 75° off-axis.
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A. F. Cheng, S. J. Conard, H. A. Weaver, F. Morgan, M. Noble, "Stray light performance of the long range reconnaissance imager (LORRI) on the New Horizons Mission," Proc. SPIE 7731, Space Telescopes and Instrumentation 2010: Optical, Infrared, and Millimeter Wave, 77311A (5 August 2010); https://doi.org/10.1117/12.859468