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The author:(作者)aaapublished in(发表于) 2013/12/12 9:31:44 Chang the third successful lunar lower axle control
China News Agency, Beijing, December 10 (ouyangkaiyuxiebo Jiang Ning), December 10, Beijing time, Chang third successful implementation in lunar orbit, orbit control and successfully enter the planned lunar landing preparations on track.
The orbital maneuver is implemented in the side of the moon. 18:00 the same day, the Beijing Aerospace command and control center Xiang Change third injection attitude and orbit parameters. 20:37, Chang e, third entering the region on the back of the moon. 21:20 to become immortal, the third engine ignition successfully started for orbit control.
Day 21:24 to become immortal, the third back to the near side of the Moon, according to the ground control station to monitor data analysis to become immortal, the third from the lunar surface with an average height of about 100-kilometer lunar orbit successfully entered in recent months about cent, apolune altitude of about 15-kilometer orbits.
Previously, Beijing time on December 6 to become immortal, the third probe, the successful implementation of braking in recent months, successfully entered lunar orbit. Chang, first, second mission step by step implement different braking in recent months, the brake using a new developed engine, braking reached the target orbit control strategies adopted, greater risk and difficulty of the task, the detector control and measurement accuracy of a measurement and control system put forward higher requirements. (End text)
(Original title: Chang, third successful lunar drop axle control)
中新社北京12月10日电 (欧阳开宇 谢波 姜宁)北京时间12月10日21时20分，嫦娥三号在环月轨道成功实施变轨控制，顺利进入预定的月面着陆准备轨道。
此次轨道机动是在月球背面实施的。当天18时00分，北京航天飞行控制中心向嫦娥三号注入调姿和变轨参数。20时37分，嫦娥三号进入月球背面区域。21时20分，嫦娥三号发动机成功点火，开始实施变轨控制。
当天21时24分，嫦娥三号重新回到月球正面，根据地面测控站监视数据分析判断，嫦娥三号已由距月面平均高度约100千米的环月轨道，成功进入近月点高度约15千米、远月点高度约100千米的椭圆轨道。
此前，北京时间12月6日17时53分，嫦娥三号探测器成功实施近月制动，顺利进入环月轨道。与嫦娥一号、二号任务分步实施近月制动不同，此次制动使用新研制的器载发动机，采用一次制动达到目标轨道的控制策略，任务风险和难度更大，对探测器控制能力和测控系统的测量精度提出了更高要求。(完)
（原标题：嫦娥三号成功实施环月降轨控制）
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