The Touch And Go Camera System (TAGCAMS) is a three-camera-head instrument onboard NASA’s OSIRIS-REx asteroid sample return mission spacecraft. The purpose of TAGCAMS is to facilitate navigation to the target asteroid, (101955) Bennu; confirm acquisition of the asteroid sample; document asteroid sample stowage; and provide supplementary imaging for OSIRIS-REx science investigations. During the almost two-year OSIRIS-REx outbound cruise phase we pursued nine TAGCAMS imaging campaigns to check, calibrate and characterize the camera system’s performance before asteroid arrival and proximity operations began in late 2018. The TAGCAMS in-flight calibration dataset provides the relevant information to enable the three cameras to complete their primary observation goals during asteroid operations. The key performance parameters that we investigated in flight included: linearity, responsivity (both point source and extended body), dark current, hot pixels, pointing, image geometry transformation, image quality and stray light. Analyses of the in-flight performance either confirmed the continued applicability of the TAGCAMS ground test results or substantially improved upon the ground test knowledge. In addition, the TAGCAMS calibration observations identified the source of a spacecraft outgassing feature that guided successful remediation efforts prior to asteroid arrival.

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OSIRIS-REx Touch And Go 相机系统 (TAGCAMS) 的飞行校准和性能

Touch And Go 相机系统 (TAGCAMS) 是 NASA 的 OSIRIS-REx 小行星样本返回任务航天器上的三摄像头仪器。TAGCAMS 的目的是促进导航到目标小行星 (101955) Bennu；确认获得小行星样本；记录小行星样本存放；并为 OSIRIS-REx 科学研究提供补充成像。在近两年的 OSIRIS-REx 出航巡航阶段，我们进行了 9 次 TAGCAMS 成像活动，以在 2018 年底小行星到达和接近操作开始之前检查、校准和表征相机系统的性能。 TAGCAMS 飞行校准数据集提供了相关信息使三台摄像机能够在小行星运行期间完成其主要观测目标。我们在飞行中研究的关键性能参数包括：线性度、响应度（点源和扩展体）、暗电流、热像素、指向、图像几何变换、图像质量和杂散光。对飞行性能的分析要么证实了 TAGCAMS 地面测试结果的持续适用性，要么大大改进了地面测试知识。此外，TAGCAMS 校准观测确定了航天器除气特征的来源，该特征在小行星到达之前指导了成功的修复工作。对飞行性能的分析要么证实了 TAGCAMS 地面测试结果的持续适用性，要么大大改进了地面测试知识。此外，TAGCAMS 校准观测确定了航天器除气特征的来源，该特征在小行星到达之前指导了成功的修复工作。对飞行性能的分析要么证实了 TAGCAMS 地面测试结果的持续适用性，要么大大改进了地面测试知识。此外，TAGCAMS 校准观测确定了航天器除气特征的来源，该特征在小行星到达之前指导了成功的修复工作。