国家航空航天局的朱诺号航天器飞往木星旅程过半


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分类: 科学与技术 |
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NASA的朱诺号航天器已完成飞往木星的漫长旅途的一半里程。
国家航空航天局(NASA)的朱诺号(Juno)航天器已完成飞往木星(Jupiter)的一半旅程。该航天器于8月12日协调世界时(UTC)12:25到达此里程碑。
朱诺号的首席研究员、圣安东尼奥市(San Antonio)西南研究院(Southwest Research Institute)的斯科特•博尔顿(Scott Bolton)说:“朱诺号的里程表刚刚显示达到9.464天文单位。我们的团队期待着,为进入我们太阳系最庞大的行星的轨道飞行的那一天做准备。”
天文单位是衡量地球到太阳的距离的单位,一个天文单位为149,597,870.7公里。朱诺号已经飞行了9.464个天文单位,剩余的飞行距离还有14多亿公里。朱诺号到达该里程碑时,它离地球的距离为5546万公里。在飞往木星的近5年的旅程中,下一个里程碑将会出现在10月份,届时朱诺号将飞越地球,借此提速飞行。
加州帕萨迪纳市(Pasadena, California)NASA喷气推进实验室(Jet Propulsion Laboratory)的该使命的项目主管里克•内班肯(Rick Nybakken)说:“10月9日那天朱诺号将到达离地球347英里[约合559公里]的位置。飞越地球将给朱诺号有力的助推,提速达到每小时16,330英里[大约每秒7.3公里]。到达那个位置之后,下一站就是木星了。”
朱诺号将于2016年7月4日加州时间晚7:29(协调世界时7月5日2:29)到达木星。
朱诺号于2011年8月5日发射。该航天器一旦进入木星的轨道,它将从一端到另一端绕木星飞行33次,并将使用它的8个科学仪器探测这个庞大气体行星模糊的云层下面的物质。朱诺号的科学团队将了解木星的起源、结构、大气层和磁层,并寻找可能存在的固体行星核。
意大利航天局(Italian Space Agency)为朱诺号使命提供了一台红外仪并参加了一部分无线电科学实验。
Read more: http://iipdigital.usembassy.gov/st/chinese/inbrief/2013/08/20130816281211.html#ixzz2cTPbxkt4
NASA’s Juno Is Halfway to Jupiter
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NASA’s Juno spacecraft reaches the halfway point on its long journey to Jupiter.
NASA’s Juno spacecraft is halfway to Jupiter. The spacecraft reached the milestone August 12 at 12:25 UTC.
“Juno’s odometer just clicked over to 9.464 astronomical units,” said Juno principal investigator Scott Bolton of the Southwest Research Institute in San Antonio. “The team is looking forward, preparing for the day we enter orbit around the most massive planet in our solar system.”
An astronomical unit is a unit of measure based on the distance between Earth and the sun and is 149,597,870.7 kilometers long. The 9.464 astronomical units Juno has already traveled, and still has left to go, are more than 1.4 billion kilometers. Juno was 55.46 million kilometers from Earth when the milestone was reached. The next milestone in the nearly five-year journey to Jupiter will occur in October, when the spacecraft flies past Earth in search of extra speed.
“On October 9, Juno will come within 347 miles [559 kilometers] of Earth,” said the mission’s project manager, Rick Nybakken of NASA’s Jet Propulsion Laboratory in Pasadena, California. “The Earth flyby will give Juno a kick in the pants, boosting its velocity by 16,330 mph [about 7.3 kilometers per second]. From there, it’s next stop Jupiter.”
Juno will arrive at Jupiter on July 4, 2016, at 7:29 p.m. in California (2:29 July 5 UTC).
Juno was launched on August 5, 2011. Once in orbit around Jupiter, the spacecraft will circle the planet 33 times, from pole to pole, and use its collection of eight science instruments to probe beneath the gas giant’s obscuring cloud cover. Juno’s science team will learn about Jupiter’s origins, structure, atmosphere and magnetosphere, and look for a potential solid planetary core.
The Italian Space Agency contributed an infrared instrument and a portion of the radio science experiment to the Juno mission.
Read more: http://iipdigital.usembassy.gov/st/english/inbrief/2013/08/20130813280541.html#ixzz2cTPdTwq1