Article

Space Science Reviews

, Volume 140, Issue 1, pp 189-215

First online:

Long-Range Reconnaissance Imager on New Horizons

  • A. F. ChengAffiliated withThe Johns Hopkins University Applied Physics Laboratory Email author 
  • , H. A. WeaverAffiliated withThe Johns Hopkins University Applied Physics Laboratory
  • , S. J. ConardAffiliated withThe Johns Hopkins University Applied Physics Laboratory
  • , M. F. MorganAffiliated withThe Johns Hopkins University Applied Physics Laboratory
  • , O. Barnouin-JhaAffiliated withThe Johns Hopkins University Applied Physics Laboratory
  • , J. D. BoldtAffiliated withThe Johns Hopkins University Applied Physics Laboratory
  • , K. A. CooperAffiliated withThe Johns Hopkins University Applied Physics Laboratory
  • , E. H. DarlingtonAffiliated withThe Johns Hopkins University Applied Physics Laboratory
  • , M. P. GreyAffiliated withThe Johns Hopkins University Applied Physics Laboratory
    • , J. R. HayesAffiliated withThe Johns Hopkins University Applied Physics Laboratory
    • , K. E. KosakowskiAffiliated withSSG Precision Optronics
    • , T. MageeAffiliated withThe Johns Hopkins University Applied Physics Laboratory
    • , E. RossanoAffiliated withThe Johns Hopkins University Applied Physics Laboratory
    • , D. SampathAffiliated withSSG Precision Optronics
    • , C. SchlemmAffiliated withThe Johns Hopkins University Applied Physics Laboratory
    • , H. W. TaylorAffiliated withThe Johns Hopkins University Applied Physics Laboratory

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Abstract

The LOng-Range Reconnaissance Imager (LORRI) is the high-resolution imaging instrument for the New Horizons mission to Pluto, its giant satellite Charon, its small moons Nix and Hydra, and the Kuiper Belt, which is the vast region of icy bodies extending roughly from Neptune’s orbit out to 50 astronomical units (AU). New Horizons launched on January 19, 2006, as the inaugural mission in NASA’s New Frontiers program. LORRI is a narrow-angle (field of view=0.29°), high-resolution (4.95 μrad pixels), Ritchey-Chrétien telescope with a 20.8-cm diameter primary mirror, a focal length of 263 cm, and a three-lens, field-flattening assembly. A 1,024×1,024 pixel (optically active region), thinned, backside-illuminated charge-coupled device (CCD) detector is used in the focal plane unit and is operated in frame-transfer mode. LORRI provides panchromatic imaging over a bandpass that extends approximately from 350 nm to 850 nm. LORRI operates in an extreme thermal environment, situated inside the warm spacecraft with a large, open aperture viewing cold space. LORRI has a silicon carbide optical system, designed to maintain focus over the operating temperature range without a focus adjustment mechanism. Moreover, the spacecraft is thruster-stabilized without reaction wheels, placing stringent limits on the available exposure time and the optical throughput needed to satisfy the measurement requirements.

Keywords

Pluto Jupiter Satellites Telescopes Calibration Imaging science