The OSIRIS-REx Camera Suite (OCAMS) onboard the OSIRIS-REx spacecraft is used to study the shape and surface of the mission’s target, asteroid (101955) Bennu, in support of the selection of a sampling site. We present calibration methods and results for the three OCAMS cameras—MapCam, PolyCam, and SamCam—using data from pre-flight and in-flight calibration campaigns. Pre-flight calibrations established a baseline for a variety of camera properties, including bias and dark behavior, flat fields, stray light, and radiometric calibration. In-flight activities updated these calibrations where possible, allowing us to confidently measure Bennu’s surface. Accurate calibration is critical not only for establishing a global understanding of Bennu, but also for enabling analyses of potential sampling locations and for providing scientific context for the returned sample.

中文翻译：

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OSIRIS-REx 相机套件的地面和飞行校准

OSIRIS-REx 航天器上的 OSIRIS-REx 相机套件 (OCAMS) 用于研究任务目标小行星 (101955) Bennu 的形状和表面，以支持采样地点的选择。我们使用来自飞行前和飞行中校准活动的数据，展示了三个 OCAMS 相机（MapCam、PolyCam 和 SamCam）的校准方法和结果。飞行前校准为各种相机属性建立了基线，包括偏置和暗行为、平场、杂散光和辐射校准。飞行中的活动在可能的情况下更新了这些校准，使我们能够自信地测量 Bennu 的表面。准确的校准不仅对于建立对 Bennu 的全球了解至关重要，