本帖最后由 浩瀚星海 于 2009-4-26 09:53 编辑
这些图片都是由CASSINI号土星探测器在近几年拍摄的。
所使用的摄影器材数据如下:(NASA网站原文)
Wide Angle Camera [WAC](20 cm f/3.5 refractor; 380-1100 nm; 18 filters; 3.5ox3.5o)
Narrow Angle Camera [NAC](2 m f/10.5 reflector; 200-1100 nm; 24 filters; 0.35ox0.35o)
Mass (current best estimate) = 57.83 kg
Peak Operating Power (current best estimate) = 55.90 W
Peak Data Rate (current best estimate) = 365.568 kilobits/sec
Dimensions (approximate) = 95x40x33 cm (NAC); 55x35x33 cm (WAC)
Mass (current best estimate) = 57.83 kg
Peak Operating Power (current best estimate) = 55.90 W
Peak Data Rate (current best estimate) = 365.568 kilobits/sec
Dimensions (approximate) = 95x40x33 cm (NAC); 55x35x33 cm (WAC)
卡西尼成像科学系统(少部分是红外设备),其中有宽窄视场两个镜头,宽视场镜头焦距是200 mm,窄视场2000 mm,焦比分别是3.5和10.5,因为卡西尼与土星距离比较近,没有必要带口径很大的望远镜。 |