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美国家航空与太空局消息:卡西尼号探测器将脱

时间:2011-01-15 13:50 点击:
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美国家航空与太空局的卡西尼轨道卫星——高清土星照片不倦的拍摄者,上星期意外地自动开启安全模式。
美国家航空与太空局喷气推进实验室的项目主任Bob Mitchell表示:该航天器本身是健康的,但要到十一月24号才能恢复运转。
美国家航空与太空局的工程师们判定,一些指令文件在地球与土星之间被阻断。通常情况下,卡西尼号的计算机系统拒绝任何中断指令,但不知怎么的,这次却接受了,Mitchell说。
信息流也许是被太阳耀斑爆发所激喷向宇宙空间的电离子流阻断的,和绕地轨道卫星有时与地球失去联络是一样的道理。
无论什么时候,只要飞行器运转需要地面指挥科学家的参与,却又无法与地面取得联系,飞行器就会自动触发安全模式。自从它启动安全模式(美国家航空与太空局称之为“应急自我保护模式”),卡西尼号就停止了搜集科学数据,只送回技术数据和飞行器运转状况。
这很正常,Mitchell说。“飞行器做着它该做的事情,”他告诉我们,当卫星重新启动“就目前的飞行器来说,将会像什么都没有发生过一样。”
但卡西尼工作团队可能会决定让它处于安全模式状态,直到下一个预定的数据搜集序列,将开始于11月24号,Michell补充道。工程师们将要重新设定在卡西尼号中软件中的许多重要数据,如设备开启指示器和能耗量。
“将会有许多大的变动,”Mitchell说,“却也好过冒着再来一次安全模式的风险,或造成损坏,我还是觉得小心为妙。”
这是卡西尼号自从1997年发射以来第六次进入安全模式,不过从它2004年到达火星以来这只是第二次。那时候,由于被宇宙射线撞击计算机和转动电源开关安全模式被激活。
“考虑到我们在卡西尼号做的指令的复杂性,卡西尼号的表现对我们来说算是异常不错了,”Mitchell说。
但这个“嗝”打的很不是时候了。卡西尼号本预计于11月11日飞过土星最大的卫星——泰坦。虽然仍会飞过泰坦,但泰坦上的科学仪器这次将不会启动并及时运转了。
“失去一次泰坦之旅是个损失,”Mitchell说。

不过仍有一线希望:从现在到2017年间卡西尼号的持续任务中,它还将会有53次路过泰坦。"

译文:Nasa: Cassini camera will be offline for two weeks


Nasa’s , the powerhouse producer of , unexpectedly put itself into “safe mode” last week.

is healthy, but will be convalescing until 24 November, said Cassini program manager Bob Mitchell of Nasa’s Jet Propulsion Lab.

Nasa engineers determined that some command files were corrupted en route from Earth to Saturn. Usually Cassini’s computers reject any corrupted commands, but somehow this one got through, Mitchell said.

The data stream may have been interrupted by solar flares, which spew jets of charged plasma into space and are known to pose problems for as well.

The craft automatically triggers its safe-mode settings whenever something happens that requires attention from mission controllers on the ground. Since going into safe mode (what Nasa terms a “safing event”), Cassini has stopped collecting science data and sent back only data on engineering and spacecraft health.

That’s normal, Mitchell said. “The spacecraft did everything it was supposed to do,” he told Wired. When the satellite reboots, “it will be as though nothing had ever happened, as far as the spacecraft is concerned.”

But the Cassini team will probably elect to leave the orbiter in safe mode until the next scheduled data-collecting sequence begins on 24 November, Michell added. Engineers will need to reset a lot of values in Cassini’s software by hand, such as indicators for which instruments are on and how much power is being used.

“There’s a lot of housecleaning to be done,” Mitchell said. “Rather than risk another safing event, or do damage, my preference is to take it careful.”

This is the sixth time Cassini has gone into safe mode since its launch in 1997, and only the second since it arrived at in 2004. That time, the safety switch was thrown by a cosmic ray striking the computers and throwing a power switch.

“Considering the complexity of demands we have made on Cassini, the spacecraft has performed exceptionally well for us,” Mitchell said.

But the hiccup came at an awkward time. The spacecraft was scheduled to fly past Saturn’s largest moon, Titan, on 11 November. The flyby will still happen, but the scientific instruments won’t be up and running again in time.

“Losing one [Titan flyby] will hurt,” Mitchell said.

There’s a silver lining, though: Cassini has 53 more Titan flybys planned between now and the end of its .


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