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The author:(作者)hpmailerpublished in(发表于) 2013/12/1 20:43:05 Chang launched into a 24-hour countdown， make 6-launch package
Tomorrow, Chang e, third with "Moon" Rover journey set foot on the moon. NASA yesterday released, Chang-third mission launch site area command decided to become immortal, the third spacecraft will launch on December 2 at the Xichang satellite launch Center.
November 30 reporters from the Xichang satellite launch Center learned that Chang-all 6 of the third satellite launch window, from December 2, two per day. Among them, the first window width is 4 minutes, 1 minute for the second window. Xichang satellite launch Center Deputy Director Zhao Min, said, at present, the launch site 6 launch package has been developed.
At present, the launch site facilities and equipment in good condition, the test results are normal, complete the region's integrated training, and launch preparatory work is going smoothly.
Sun Baowei, Secretary of the Xichang satellite launch Center, said Chang, third detector indicators fully meet the emission requirements, the weather was very good and recently in Xichang, yesterday started rocket propellant filling heralded into the launch sequence.
Chang, third for the first time, achieve a lunar soft landing and surface inspection surveys. Chang third, also will challenge human science detection Moon history Shang of several first: will first put Observatory rack to Moon Shang, through landing players Shang carrying of months base telescope, will in international Shang first achieved in moon Shang observation stars, and Galaxy and universe; also will through visits players bottom of measuring months radar, on Moon for to under 30 m deep soil layer of structure and 100 m deep of times surface structure two a depth Shang of fine detection.
Expert analysis
Chang, third were selected 6 launch window
Lunar satellite launch time is how to choose one? II, a researcher at the space technology Institute of the aerospace science and technology group pointed out that due to the improved rocket technology, optimum design of window the rocket, adding launch window, 3 days to launch in a month, two Windows each day, that is to become immortal, third, total 6 launch window is selected, the first window width is 4 minutes and the second window width is 1 minute.
Jiang Jie, Chief Designer of the launch vehicle system, explained, such as the first day, the first window to launch up to a 4-minute delay, if not implemented the first window, then allowed off to the next window. Second window is another one track, then in accordance with the second rocket launches as soon as only a 1-minute delay out of the window. Morning news reporter Hana
December 01, 2013 Beijing morning post(嫦娥发射进入24小时倒计时 制定6套发射方案|嫦娥三号|窗口|方案_新闻资讯
明天，嫦娥三号将带着“玉兔号”月球车踏上奔月旅程。国家航天局昨天发布，经嫦娥三号任务发射场区指挥部研究决定，嫦娥三号探测器将于12月2日1时30分在西昌卫星发射中心实施发射。
记者11月30日从西昌卫星发射中心了解到，嫦娥三号卫星的发射窗口共6个，从12月2日至4日，每天两个。其中，第一窗口宽度为4分钟，第二窗口为1分钟。西昌卫星发射中心副主任赵民说，目前，发射场已制定了6套发射方案。
目前，发射场设施设备状态良好，各项测试结果正常，已完成全区综合演练，发射任务准备工作进展顺利。
西昌卫星发射中心党委书记孙保卫表示，嫦娥三号探测器的各项指标完全符合发射要求，而且最近西昌的天气也非常好，昨日起就开始了火箭推进剂的加注，预示着进入了发射程序。
嫦娥三号将首次实现月球软着陆和月面巡视勘察。嫦娥三号还将挑战人类科学探测月球历史上的几个第一：将首次把天文台架到月球上，通过着陆器上携带的月基天文望远镜，将在国际上首次实现在月球上观测恒星、星系和宇宙；还将通过巡视器底部的测月雷达，对月球进行地底下30米深土壤层的结构和100米深的次表层结构两个深度上的精细探测。
■专家解读
嫦娥三号共选择6个发射窗口
探月卫星的发射时间是如何选择的呢？航天科技集团空间技术研究院研究员庞之浩指出，由于此次火箭技术的提高，对火箭进行了窗口优化设计，增加了发射窗口，一个月有3天可发射，每天有两个窗口，也就是说，嫦娥三号共选择了6个发射窗口，第一个窗口宽度为4分钟，第二窗口宽度为1分钟。
运载火箭系统总设计师姜杰此前解释说，比如第一天，第一个窗口发射最多推迟4分钟，如果第一个窗口没有实施，那么允许推迟到第二窗口。第二窗口就完全是另外一条轨道了，那么再按照第二个窗口只能推迟1分钟就要把火箭发射出去。晨报记者 韩娜
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