CCD Centroiding Experiment for Correcting a Distorted Image on the Focal Plane
CCD Centroiding Experiment for Correcting a Distorted Image on the Focal Plane
复制标题
DOI：
10.1086/508365
复制
发表时间：
2006-10
影响因子：
3.5
通讯作者：
T. Yano;H. Araki;N. Gouda;Yukiyasu Kobayashi;T. Tsujimoto;T. Nakajima;N. Kawano;S. Tazawa;Yoshiyuki Yamada;H. Hanada;K. Asari;S. Tsuruta
中科院分区：
文献类型：
--
作者：
T. Yano;H. Araki;N. Gouda;Yukiyasu Kobayashi;T. Tsujimoto;T. Nakajima;N. Kawano;S. Tazawa;Yoshiyuki Yamada;H. Hanada;K. Asari;S. Tsuruta
JASMINE（日本红外探测天体测量卫星任务）和 ILOM（原位月球方位测量）是日本国家天文台正在进行的太空任务。这两个项目需要一种通用的天体测量技术来获得固态探测器上星图的精确位置，以实现其目标。在实验室中，我们对 CCD 阵列上的人造星图像的质心进行了测量，以便研究恒星位置的精度，使用一种根据恒星的光子加权平均值来估计恒星位置的算法。在校准星像在焦平面的位置时，我们还考虑了光学像差引起的最低阶畸变，它与距光轴距离的三次方成正比。据此，我们发现恒星位置的测量精度一次测量可以达到1/100像素以下。
JASMINE (Japan Astrometry Satellite Mission for Infrared Exploration) and ILOM (In situ Lunar Orientation Measurement) are space missions that are in progress at the National Astronomical Observatory of Japan. These two projects require a common astrometric technique to obtain precise positions of star images on solid‐state detectors in order to accomplish their objectives. In the laboratory, we have carried out measurements of the centroid of artificial star images on a CCD array in order to investigate the precision of the positions of the stars, using an algorithm for estimating them from photon‐weighted means of the stars. In the calibration of the position of a star image at the focal plane, we have also taken into account the lowest order distortion due to optical aberrations, which is proportional to the cube of the distance from the optical axis. Accordingly, we find that the precision of the measurement for the positions of the stars reaches below 1/100 pixel for one measurement.