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BEIJING, Jan. 11 -- The service module of China's unmanned test lunar orbiter successfully decelerated which allowed it to enter an 8-hour orbit on Sunday, according to the Beijing Aerospace Control Center.

Following instructions from the center, the service module conducted the braking at around 3 a.m. and entered the 8-hour elliptical moon orbit with a perilune of about 200 km and an apolune of about 5,300 km.

The spacecraft has sustained balanced energy and is in a sound condition, according to the center, adding that the center exercised timely and stable control and tracing of the service module and relevant tests had been carried out smoothly.

The module will make its second and third braking in the early hours of Jan. 12 and 13 respectively to enable it to enter the target 127-minute orbit for tests to prepare for the next lunar probe mission, Chang'e-5, said center's chief engineer Zhou Jianliang.

The test lunar orbiter was launched on Oct. 24. The service module was separated from the orbiter's return capsule on Nov. 1, and the return capsule returned to Earth on Nov. 1 after circling the moon during its eight-day mission.