论文标题
远程侦察成像仪（Lorri）的机上性能和校准新视野任务
In-Flight Performance and Calibration of the LOng Range Reconnaissance Imager (LORRI) for the New Horizons Mission
论文作者
论文摘要
远距离侦察成像仪（Lorri）是一种全型（360--910 nm），狭窄角度（视野= 0.29度），高空间分辨率（像素比例= 1.02 ARCSEC）可见光成像仪，用于NASA的新视野（NH），用于科学的NEW Horizons（NH），用于科学的科学观察和optical Varications and Optical Aradications。 NH于2006年1月19日发布几个月后，校准观察开始了几个月，并且在整个任务过程中每年都重复进行，这一任务正在进行中。本文介绍了机上Lorri校准测量值，以及我们对校准数据的分析得出的结果。洛里（Lorri）随着时间的推移非常稳定，自推出以来，灵敏度或光学性能没有可检测到的变化（在1％的水平上）。通过在读取过程中使用4乘4重新添加CCD像素，一种特殊的航天器跟踪模式，30秒的曝光时间以及大约100张图像的共同添加，Lorri可以检测到未解决的目标至V = 22（SNR = 5）。 Lorri图像的瞬时动态范围为3500，与曝光时间控制相结合，范围从0ms到64,967毫秒，1毫秒1毫秒的步骤支持高分辨率，对行星目标的高灵敏度成像，这些目标跨越了跨越木星的行星距离，从木星到库珀的深处，在库珀腰带中深处，从而实现了各种各样的科学研究。我们在这里描述了如何将Lorri图像从RAW（工程）单元转换为已解决目标和未解决目标的科学（校准）单元。我们还描述了在某些观察情况下可能影响Lorri图像的解释的各种工具伪像。
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 for both science observations and optical navigation. Calibration observations began several months after the NH launch on 2006 January 19 and have been repeated annually throughout the course of the mission, which is ongoing. This paper describes the in-flight LORRI calibration measurements, and the results derived from our analysis of the calibration data. LORRI has been remarkably stable over time with no detectable changes (at the 1% level) in sensitivity or optical performance since launch. By employing 4 by 4 re-binning of the CCD pixels during read out, a special spacecraft tracking mode, exposure times of 30 sec, and co-addition of approximately 100 images, LORRI can detect unresolved targets down to V = 22 (SNR=5). LORRI images have an instantaneous dynamic range of 3500, which combined with exposure time control ranging from 0ms to 64,967 ms in 1ms steps supports high resolution, high sensitivity imaging of planetary targets spanning heliocentric distances from Jupiter to deep in the Kuiper belt, enabling a wide variety of scientific investigations. We describe here how to transform LORRI images from raw (engineering) units into scientific (calibrated) units for both resolved and unresolved targets. We also describe various instrumental artifacts that could affect the interpretation of LORRI images under some observing circumstances.
