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美國家航空與太空局消息:卡西尼號探測器將脫

時間:2011-01-15 13:50 點擊:
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美國家航空與太空局的卡西尼軌道衛星——高清土星照片不倦的拍攝者,上星期意外地自動開啟安全模式。
美國家航空與太空局噴氣推進實驗室的項目主任Bob Mitchell表示:該航天器本身是健康的,但要到十一月24號才能恢復運轉。
美國家航空與太空局的工程師們判定,一些指令文件在地球與土星之間被阻斷。通常情況下,卡西尼號的計算機系統拒絕任何中斷指令,但不知怎么的,這次卻接受了,Mitchell說。
信息流也許是被太陽耀斑爆發所激噴向宇宙空間的電離子流阻斷的,和繞地軌道衛星有時與地球失去聯絡是一樣的道理。
無論什么時候,只要飛行器運轉需要地面指揮科學家的參與,卻又無法與地面取得聯系,飛行器就會自動觸發安全模式。自從它啟動安全模式(美國家航空與太空局稱之為“應急自我保護模式”),卡西尼號就停止了搜集科學數據,只送回技術數據和飛行器運轉狀況。
這很正常,Mitchell說。“飛行器做著它該做的事情,”他告訴我們,當衛星重新啟動“就目前的飛行器來說,將會像什么都沒有發生過一樣。”
但卡西尼工作團隊可能會決定讓它處于安全模式狀態,直到下一個預定的數據搜集序列,將開始于11月24號,Michell補充道。工程師們將要重新設定在卡西尼號中軟件中的許多重要數據,如設備開啟指示器和能耗量。
“將會有許多大的變動,”Mitchell說,“卻也好過冒著再來一次安全模式的風險,或造成損壞,我還是覺得小心為妙。”
這是卡西尼號自從1997年發射以來第六次進入安全模式,不過從它2004年到達火星以來這只是第二次。那時候,由于被宇宙射線撞擊計算機和轉動電源開關安全模式被激活。
“考慮到我們在卡西尼號做的指令的復雜性,卡西尼號的表現對我們來說算是異常不錯了,”Mitchell說。
但這個“嗝”打的很不是時候了。卡西尼號本預計于11月11日飛過土星最大的衛星——泰坦。雖然仍會飛過泰坦,但泰坦上的科學儀器這次將不會啟動并及時運轉了。
“失去一次泰坦之旅是個損失,”Mitchell說。

不過仍有一線希望:從現在到2017年間卡西尼號的持續任務中,它還將會有53次路過泰坦。"

譯文: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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