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[美国发射] 2016年9月9日07:05,小行星取样返回任务OSIRIS-REx/NF-3由Atlas V-411自卡角发射

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chenyiqun000 发表于 2016-9-13 13:01 | 显示全部楼层
谁能告诉我,发射时,整流罩底部一直横着的那个杆子是做什么用的?
cmj9808 发表于 2016-9-13 18:40 | 显示全部楼层
chenyiqun000 发表于 2016-9-13 13:01
谁能告诉我,发射时,整流罩底部一直横着的那个杆子是做什么用的?

气氢排放口/GH2 vent fin
wsl20005 发表于 2017-9-4 13:46 | 显示全部楼层
2017年9月22日,地球引力助推。

http://www.spacedaily.com/reports/NASAs_Asteroid_Bound_Spacecraft_to_Slingshot_Past_Earth_999.html

NASA's asteroid sample return mission, OSIRIS-REx (Origins, Spectral Interpretation, Resource Identification, and Security - Regolith Explorer), will pass about 10,000 miles (16,000 kilometers) above Earth just before 12:52 p.m. EDT on Friday, Sept. 22. Using Earth as a slingshot, the spacecraft will receive an assist to complete its journey to the asteroid Bennu.
OSIRIS-REx is undertaking a challenging mission to visit the near-Earth asteroid, survey the surface, collect samples and deliver them safely back to Earth. This is the first NASA mission to attempt such an undertaking. The spacecraft is halfway through its two-year outbound journey, and now OSIRIS-REx needs an extra boost to successfully rendezvous with Bennu.
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osiris-rex_ega_beauty_shot.png

wsl20005 发表于 2017-9-20 17:25 | 显示全部楼层
http://www.heavens-above.com/OsirisFinder.aspx?lat=0&lng=0&loc=Unspecified&alt=0&tz=UCT

FlybyChart.png
wsl20005 发表于 2017-9-23 07:32 来自航空航天港手机版! | 显示全部楼层
NASA’S OSIRIS-REx Spacecraft Slingshots Past Earth
September 22, 2017 -
NASA’s asteroid sample return spacecraft successfully used Earth’s gravity on Friday to slingshot itself on a path toward the asteroid Bennu, for a rendezvous next August.

At 12:52 p.m. EDT on Sept. 22, the OSIRIS-REx (Origins, Spectral Interpretation, Resource Identification, and Security – Regolith Explorer) spacecraft came within 10,711 miles (17,237 km) of Antarctica, just south of Cape Horn, Chile, before following a route north over the Pacific Ocean.

OSIRIS-REx launched from Cape Canaveral Air Force Station in Florida on Sept. 8, 2016, on an Atlas V 411 rocket. Although the rocket provided the spacecraft with the all the momentum required to propel it forward to Bennu, OSIRIS-REx needed an extra boost from the Earth’s gravity to change its orbital plane. Bennu’s orbit around the Sun is tilted six degrees from Earth’s orbit, and this maneuver changed the spacecraft’s direction to put it on the path toward Bennu.

As a result of the flyby, the velocity change to the spacecraft was 8,451 miles per hour (3.778 kilometers per second).

“The encounter with Earth is fundamental to our rendezvous with Bennu,” said Rich Burns, OSIRIS-REx project manager at NASA’s Goddard Space Flight Center in Greenbelt, Maryland. “The total velocity change from Earth’s gravity far exceeds the total fuel load of the OSIRIS-REx propulsion system, so we are really leveraging our Earth flyby to make a massive change to the OSIRIS-REx trajectory, specifically changing the tilt of the orbit to match Bennu.”

The mission team also is using OSIRIS-REx’s Earth flyby as an opportunity to test and calibrate the spacecraft’s instrument suite. Approximately four hours after the point of closest approach, and on three subsequent days over the next two weeks, the spacecraft’s instruments will be turned on to scan Earth and the Moon. These data will be used to calibrate the spacecraft’s science instruments in preparation for OSIRIS-REx’s arrival at Bennu in late 2018.

“The opportunity to collect science data over the next two weeks provides the OSIRIS-REx mission team with an excellent opportunity to practice for operations at Bennu,” said Dante Lauretta, OSIRIS-REx principal investigator at the University of Arizona, Tucson. “During the Earth flyby, the science and operations teams are co-located, performing daily activities together as they will during the asteroid encounter.”

The OSIRIS-REx spacecraft is currently on a seven-year journey to rendezvous with, study, and return a sample of Bennu to Earth. This sample of a primitive asteroid will help scientists understand the formation of our solar system more than 4.5 billion years ago.

NASA’s Goddard Space Flight Center provides overall mission management, systems engineering and the safety and mission assurance for OSIRIS-REx. Dante Lauretta of the University of Arizona, Tucson, is the principal investigator, and the University of Arizona also leads the science team and the mission’s science observation planning and data processing. Lockheed Martin Space Systems in Denver built the spacecraft and is providing flight operations. Goddard and KinetX Aerospace are responsible for navigating the OSIRIS-REx spacecraft. OSIRIS-REx is the third mission in NASA’s New Frontiers Program. NASA’s Marshall Space Flight Center in Huntsville, Alabama, manages the agency’s New Frontiers Program for the Science Mission Directorate in Washington.
hdcscience2012 发表于 2017-9-29 09:53 | 显示全部楼层
OSIRIS-REx探测器抓住接近地球的这次机会,把科学仪器对准地球和月球拍摄,看,它拍摄的地月合影!
NavCam-Earth-and-Moon.png
http://www.asteroidmission.org/?latest-news=nasas-osiris-rex-snaps-pictures-earth-moon

又多了一张地月合影!
 楼主| hkhtg090201 发表于 2018-7-11 05:48 | 显示全部楼层
cmj9808 发表于 2018-8-21 12:07 | 显示全部楼层
上周五开始进入小行星接近阶段
Dk0Eau8V4AA2P2P.jpg
wsl20005 发表于 2018-10-3 16:37 来自航空航天港手机版! | 显示全部楼层
两年前,美国将一艘耗资18亿美元的飞船送上了太空,并赋予这艘飞船一个神圣使命:前往一颗跟地球碰撞概率只有2500分之1的小行星。飞船在深空中飞越了“寂寞”的18亿公里后,终于在今年8月份接近了目标,为了防止飞船与小行星发生意外相撞,从10月2日开始美国宇航局准备让飞船开始“减速”。
早在19年前,科学家发现太阳系内存在着一颗跟人类地球有着扯不清和掰不断关系的神秘小行星,它被命名为贝努,它的直径约为500米,平均每隔6年穿越一次地球轨道。科学家计算出它将在2135年穿越地球和月球中间,跟地球的碰撞概率约为2500分之1,因此它一直被科学家们标识为潜在威胁小行星。
虽它直径不大,但它却是一颗含有早期宇宙碎片的小行星。因此美国宇航局一咬牙花费8亿美元打造了一艘OSIRIS-REx飞船,并用10亿美元的发射费用将OSIRIS-REx飞船送入太空,并计划于2018年抵达小行星贝努。在经历了两年飞行和18亿公里的太空遨游后,小行星贝努轮廓终于展现在飞船前面,8月17日飞船给相距220万公里的小行星拍摄了第一张图片,并传回了地球人类。
深空中飞船跟小行星一样,只要有了初速度后面不需要任何燃料就可以一直飞行下去,就像早已离开太阳系的美国飞船旅行者1号一样,虽与人类失去联系,但它却还在继续向银河系中心飞去。美国宇航局打算于今年12月份OSIRIS-REx飞船抵达小行星贝努,如果此时不减速,那么12月份飞船会出现两种可怕后果,一种后果是从小行星贝努身边掠过,错过对小行星的探测。另一种后果是直接与小行星贝努相撞,OSIRIS-REx飞船将粉身碎骨,18亿美元就这样扔到了水里。
因此从10月2日开始,美国宇航宇任务团队将打算把OSIRIS-REx飞船与贝努小行星的接近速度从491米每秒减速到140米每秒,以便12月3日飞船抵达距离小行星贝努20公里的位置上,然后对小行星两极和赤道上进行一系列穿越活动。
别以为这样就完成了贝努小行星所有探索任务,OSIRIS-REx飞船最后一项重要任务是在2019年用机械手臂抓取56.7克小行星贝努的样品返回地球,不过要等到它回到地球那也是2023以后事情了。
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