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The author:(作者)hpmailerpublished in(发表于) 2013/12/5 11:13:37 Nearly 350，000 kilometers of Chang e， third flight without 3rd mid-course corrections
CNS, Beijing, December 5 (reporter Zhang Ziyang)-China Defense Science and Technology Industrial Development Bureau today said that as of December 5, Chang the third probe, have been running at about 88 hours, flying nearly 350,000 km in good working order. Mid-course corrections for the third time to cancel the scheduled for today.
On December 3, the Beijing Aerospace command and control center successfully completed a second mid-course corrections and 7,500 cattle first used motor for accurate calibration. In view of launching Chang third long third b probe rocket into orbit with higher accuracy to become immortal, the third probe, the first two mid-course corrections are also very accurate, you can meet the requirements of braking and subsequent orbit control in recent months, and to become immortal, the third spacecraft flight control programme has a good adaptability, through researching, are no longer conducted for mid-course corrections.
According to reports, the second engine 7,500 cattle intended by mid-course corrections implemented is China's first variable thrust engine, developed by China Aerospace Science and Technology Corporation is responsible for, lift can be achieved from 1500 up to 7,500 cattle a large range of continuously changing, with high performance, adaptability, combustion stability, simple structure, low cost and other notable features.
According to this schedule, Chang e, third in mid-December, snagged and Rainbow Bay area to achieve a soft landing on the Moon, surface topography and geological structure survey, surveys of surface material composition, and available resources, Earth's plasma-based optical detection and month astronomy observations for scientific exploration tasks. (End text)
(Original title: nearly 350,000 kilometers of Chang e, third flight cancelled third mid-course corrections)
中新网北京12月5日电 (记者 张子扬)中国国防科技工业局今天称，截至12月5日18时，嫦娥三号探测器已正常运行约88小时，飞行近35万公里，工作状态良好。原定于今日进行的第三次中途修正取消。
12月3日，北京航天飞行控制中心顺利完成第二次中途修正并对首次使用的7500牛发动机进行了精准标定。鉴于发射嫦娥三号探测器的长征三号乙运载火箭入轨精度较高，嫦娥三号探测器的前两次中途修正也非常精准，可以满足近月制动和后续轨道控制的要求，同时，嫦娥三号探测器飞行控制方案具有较好的适应性，经研究决定，不再进行第三次中途修正。
据介绍，第二次中途修正实施标定的7500牛发动机是中国首台变推力发动机，由中国航天科技集团公司负责研制，可实现推力从1500牛到7500牛大范围的连续变化，具有性能高、适应性强、燃烧稳定、结构简单、成本低廉等显著特点。
按照计划，嫦娥三号于12月中旬择机在月球虹湾地区实现软着陆，将开展月表形貌与地质构造调查、月表物质成分和可利用资源调查、地球等离子体层探测和月基光学天文观测等科学探测任务。(完)
(原标题：嫦娥三号已飞行近35万公里 取消第三次中途修正)
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