動力下降

powered descent

　　At 10:57 p.m. on December 1, the lander-ascender combination of Chang'e-5, from about 15 km above the lunar surface, started a powered descent with a variable thrust engine ignited. Its relative vertical velocity to the moon was lowered from 1.7 km per second to zero.

　　The probe was adjusted and approached the lunar surface during the descent. After automatically detecting and identifying obstacles, the probe selected the site and touched down on the north of the Mons Rumker in Oceanus Procellarum, also known as the Ocean of Storms, on the near side of the moon.

　　12月1日22時57分，“嫦娥五號”探測器的著陸器和上升器組合體從距離月面15公里處開始通過可變推力發(fā)動機(jī)實(shí)施動力下降，逐步將探測器相對月球的縱向速度從1.7公里/秒降為零。

　　期間，探測器進(jìn)行快 速姿態(tài)調(diào)整，逐漸接近月表;此后進(jìn)行障礙自動檢測，選定著陸點(diǎn)后，平穩(wěn)著陸在位于月球正面風(fēng)暴洋的呂姆克山脈以北地區(qū)。

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