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嫦娥撞月的不解

2009/3/3镜像同步16 回复

嫦娥撞月就这么偷偷摸摸的发生了。之前专家期待的对撞击激起的月尘的分析和国际合作都成了白扯。对此我感到很迷惑。撞月之前《北京科技报》一篇被广泛转载的文章中（http://www.astron.sh.cn/2009/news.asp?id=27）萧耐园教授对撞月的科学意义给予了很大的肯定和期待。但欧阳自远处处泼冷水，否定国际合作的可能，也否定地面观测的意义。2006年，欧洲“智能１号”卫星系统位于美国夏威夷的一个观测站拍摄到“智能１号”撞击月球后发出的“明亮闪光”。萧耐园认为：“只要保证卫星撞击前的初始速度，“嫦娥一号”卫星撞击月球产生的尘埃将肯定比“智能１号”多”。欧阳自远说：“如果‘嫦娥一号’撞击月球的时候，正好是正对地球的一面，中国的地面观测站也有可能观测到撞击形成的亮点。但是，这只能证明卫星撞上月球。” 欧阳自远比较冷静，没有好高骛远，估计是对中国自己的观测能力比较清楚，对嫦娥撞月根本就不做地面观测的计划。甚至于连尝试的勇气似乎都没有。拍摄到闪光，记录下光谱的难度应该不会很大吧。他就这么放弃了这大好的练兵机会，而且自己观测不了，也就别让别人观测了，省得自己花钱别人占便宜。于是，嫦娥就在中国的大白天，没有通知任何人的情况下，神不知鬼不觉的撞到月球上了。我非常不赞同中国的做法，先不说自己的数据有到底有没有那么珍贵，就至于藏着掖着到这个程度。看看NASA每次任务发布了多少照片，发布出来的照片是什么分辨率（我保存的最大的一张照片JPEG格式下还３００多M）。嫦娥呢，似乎就那么几张局部和一张全图，分辨率还低的惊人。不能不让人怀疑他们自己手上的照片到底有多好。连撞击时间都保密，怎么不让人觉得小气？嫦娥撞月得到的就只有“在撞击过程中，嫦娥一号卫星携带的ＣＣＤ相机传回实时图像，图像清晰。”这么多了。下面一篇文章部分内容和我的疑惑差不多，有兴趣的看看吧。看着文章的第一句，觉得有点气愤和难过，可他们就是这样做的。转自《Sky and Telescope》 http://www.skyandtelescope.com/community/skyblog/newsblog/40536117.html Chinese Craft Whacks the Moon The Chinese people are often stereotyped as being inscrutable, meaning "difficult to fathom or understand." And that about sums up my reaction to yesterday's news that the flight controllers at the Chinese National Space Administration intentionally sent the Chang'e 1 orbiter crashing into the Moon. According to this report from the Xinhua news agency, ground zero was 1.50° south, 52.36° east. That's a nondescript tract of Mare Fecunditatis about 90 miles (145 km) from the crater Messier. The spacecraft, which carried eight experiments, rocketed toward the Moon on October 24, 2007, and had been in lunar orbit for 16 months. And it was beefy, weighing in at more than 2 tons. That's comparable to the mass of a Centaur rocket that NASA's hopes to drill into one of the lunar poles later this year, along with the LCROSS spacecraft. Chang'e 1's impact undoubtedly made a sizable splash that should have been observable from Earth. So here's what I don't understand: (1) The end came at 8:13 Universal Time, which is 4:13 p.m. in Beijing's time zone. That means the Moon was up, but sunset was still about two hours away — not ideal conditions for lunar observing. (2) The near-side impact site was in daylight, yet the crash would have been closer to the terminator, or even in shadow, just a couple days ago. So why pick March 1st and not February 27th? (3) NASA officials are lining up an army of telescopes to try to record the LCROSS finale, now scheduled for early September or thereabouts. Wouldn't it have made sense for Chinese scientists to alert their Western colleagues of Chang'e 1's impending crash? At the very least, it would have been a useful test exercise. Maybe I'll get answers to some of these questions in three weeks, when I head to Houston for the annual Lunar and Planetary Science Conference. A contingent from the Chang'e 1 project will be there to present results from the mission. Posted by Kelly Beatty, March 2, 2009

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