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美飞船为避彗星机智“变速”:躲到火星背面 - 站长搜索
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美飞船为避彗星机智“变速”:躲到火星背面

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2014-08-11 20:00:35 转载来源: 网络整理/侵权必删

AS网站目录(www.adminso.com):美飞船为避彗星机智“变速”:躲到火星背面 据美国宇航局网站报道,美国宇航局的火星奥德赛飞船近日成功实施了轨道调整机动,从而为迎接今年10月19日赛丁泉彗星近距离飞掠火星做好安全防范准备。8月5日当天,这颗轨道器的推进装置持续点火5.5分钟

AS网站目录(www.adminso.com):美飞船为避彗星机智变速”:躲到火星背面

据美国宇航局网站报道,美国宇航局的火星奥德赛飞船近日成功实施了轨道调整机动,从而为迎接今年10月19日赛丁泉彗星近距离飞掠火星做好安全防范准备。

8月5日当天,这颗轨道器的推进装置持续点火5.5分钟。此次轨道机动是经过严密计算的,目的是让C/2013 A1“赛丁泉”在10月19日抵达最接近火星区域的那半小时内,这艘飞船能够正好处于火星背面的位置,从而避开可能的危险,否则科学家们担心彗星释放的大量尘埃粒子可能会对飞船造成损坏。根据计算,这颗彗星将从距离火星很近的空间飞过,其最近的距离几乎相当于地球到月球之间距离的1/3。

▲艺术示意图:正飞行在火星北极上空的“火星奥德赛”轨道器。这是迄今工作时间最长的火星飞船。最近为了躲避一颗彗星,它进行了轨道机动调整。

美国宇航局喷气推进实验室(JPL)的火星奥德赛飞船项目经理大卫・莱曼(David Lehman)表示:“模型计算显示赛丁泉彗星产生的尘埃颗粒撞击我们飞船的可能性很小,但我们仍然决定采取措施以防万一。”他说:“这些尘埃颗粒的运行速度极高,即便只有一颗击中我们的飞船,或许就能让我们的探测器从此报销。”

5号的这次机动并不会改变火星奥德赛飞船的轨道,它只是改变了它的运行时间。这艘飞船采用极轨道围绕火星飞行,大约每2小时围绕火星转一圈。此次轨道机动使用了4台轨道修正发动机,每台提供5磅(22牛顿)的推力。整个过程大约消耗目前飞船上所剩燃料量的1/100不到。

火星奥德赛目前已经成为迄今为止人类在火星上工作时间最长的探测器:2001年4月7日发射升空,并于2001年10月24日抵达火星。除了开展自身的科学考察工作,火星奥德赛飞船同时还为在火星地面上工作的漫游车提供数据中继。

火星奥德赛飞船由美国宇航局科学任务委员会管理。洛克希德马丁公司丹佛空间系统分公司负责飞船建造工作。JPL和洛克希德马丁共同负责飞船项目的日常运行。

标签: 飞船 彗星 机智 变速 火星 背面


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