The OSIRIS-REx Camera Suite (OCAMS) will acquire images essential to collecting a sample from the surface of Bennu. During proximity operations, these images will document the presence of satellites and plumes, record spin state, enable an accurate model of the asteroid’s shape, and identify any surface hazards. They will confirm the presence of sampleable regolith on the surface, observe the sampling event itself, and image the sample head in order to verify its readiness to be stowed. They will document Bennu’s history as an example of early solar system material, as a microgravity body with a planetesimal size-scale, and as a carbonaceous object. OCAMS is fitted with three cameras. The MapCam will record color images of Bennu as a point source on approach to the asteroid in order to connect Bennu’s ground-based point-source observational record to later higher-resolution surface spectral imaging. The SamCam will document the sample site before, during, and after it is disturbed by the sample mechanism. The PolyCam, using its focus mechanism, will observe the sample site at sub-centimeter resolutions, revealing surface texture and morphology. While their imaging requirements divide naturally between the three cameras, they preserve a strong degree of functional overlap. OCAMS and the other spacecraft instruments will allow the OSIRIS-REx mission to collect a sample from a microgravity body on the same visit during which it was first optically acquired from long range, a useful capability as humanity reaches out to explore near-Earth, Main-Belt and Jupiter Trojan asteroids.

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OCAMS：OSIRIS-REx 相机套件

OSIRIS-REx 相机套件 (OCAMS) 将获取对从 Bennu 表面收集样本至关重要的图像。在接近操作期间，这些图像将记录卫星和羽流的存在，记录自旋状态，实现小行星形状的准确模型，并识别任何表面危险。他们将确认表面上是否存在可采样的风化层，观察采样事件本身，并对采样头进行成像，以验证其是否准备好存放。他们将记录本努的历史，作为早期太阳系材料的一个例子，作为一个具有微行星尺寸尺度的微重力体，以及作为一个碳质物体。OCAMS 配备三个摄像头。MapCam 将记录 Bennu 的彩色图像作为接近小行星的点源，以便将 Bennu 的地面点源观测记录与后来的更高分辨率表面光谱成像连接起来。SamCam 将在样本机制干扰之前、期间和之后记录样本站点。PolyCam 使用其聚焦机制，将以亚厘米分辨率观察样品部位，揭示表面纹理和形态。虽然它们的成像要求在三个相机之间自然划分，但它们保留了高度的功能重叠。OCAMS 和其他航天器仪器将允许 OSIRIS-REx 任务在首次从远距离光学获取的同一访问中从微重力体中收集样本，