Thorpe T E
Appl Opt. 1973 Feb 1;12(2):359-63. doi: 10.1364/AO.12.000359.
Successful photography of stars by the Mariner 9 spacecraft has confirmed both mathematical prediction of point source response by vidicons and preflight calibration results. Camera-B limiting magnitude and integrated image data are presented to provide information relevant to absolute photometric reduction. These data appear consistent to better than 15% and suggest a good calibration source. Decalibration of Mars picture information, however, requires precise knowledge of Mars spectral radiance and camera point spread function. The effect of image motion on star detection thresholds is also discussed.
水手9号宇宙飞船成功拍摄到恒星，这证实了光导摄像管对点源响应的数学预测以及飞行前校准结果。给出了相机B的极限星等和积分图像数据，以提供与绝对测光归算相关的信息。这些数据的一致性优于15%，表明有一个良好的校准源。然而，对火星图像信息进行去校准需要精确了解火星的光谱辐射度和相机点扩散函数。还讨论了图像运动对恒星探测阈值的影响。
