China's first lunar probe, Chang'e-1, to reach moon orbit Monday morning

www.chinaview.cn 2007-11-04 21:27:41 Print

Special report: China launches first lunar orbiter

by Xinhua writer Li Jianmin

BEIJING, Nov. 4 (Xinhua) --

China's first lunar probe, Chang'e-1, will reach the moon's orbit Monday morning and currently, it was traveling on the expected trajectory, scientists said Sunday.

Chang'e-1, following the instructions of the Beijing Aerospace Control Center (BACC), will carry out its first braking at perilune at about 11:00 a.m. Monday to slow down, so that it can be captured by the lunar gravity and become a circumlunar satellite, said Wang Yejun, chief engineer of BACC.

"The speed of Chang'e-1 can reach 2.4 km per second when it arrives at perilune, and it will likely fly away from the moon if the braking is not conducted in time," Wang said.

"The first braking at perilune is another key moment in the long journey of Chang'e-1," he said.

China's first lunar probe, Chang'e-1, named after a legendary Chinese goddess who flew to the moon, blasted off on a Long March 3A carrier rocket on Oct. 24 from the Xichang Satellite Launch Center in southwestern Sichuan Province.

The probe completed its fourth orbital transfer late Wednesday afternoon, shifting out of its 120,000-kilometer orbit around the Earth and moving toward a 380,000-kilometer circumlunar orbit.

BACC successfully carried out an orbital correction for Chang'e-1 Friday morning to ensure that it travels on the pre-set orbit.

A second orbital correction scheduled for Sunday morning has been called off because it was "unnecessary" -- Chang'e-1 has been running accurately on the expected trajectory, a BACC scientist said.

"Currently, Chang'e-1 was traveling at a speed of more than 300meters per second toward perilune, and all data show that the satellite is operating well," Tang Geshi, BACC scientist told Xinhua late Sunday afternoon.

"We're now studying how to ensure the success of the first braking for Chang'e-1," he said.

After the probe entered the moon's orbit, it would brake several more times to slow down, scientists have said.

It is scheduled to relay the first picture of the moon in late November and would then continue scientific explorations of the moon for a year.

The 2,350-kg satellite carried eight probing facilities, including a stereo camera and interferometer, an imager and gamma/x-ray spectrometer, a laser altimeter, a microwave detector, a high energy solar particle detector and a low energy ion detector.

It will fulfill four scientific objectives, including a three-dimensional survey of the Moon's surface, analysis of the abundance and distribution of elements on lunar surface, an investigation of the characteristics of lunar regolith and the powdery soil layer on the surface, and an exploration of the circumstance between the earth and the moon.

Fair Use Notice

This site contains copyrighted material the use of which has not always been specifically authorized by the copyright owner. We are making such material available in our efforts to advance understanding of environmental, political, human rights, economic, democracy, scientific, and social justice issues, etc. We believe this constitutes a 'fair use' of any such copyrighted material as provided for in section 107 of the US Copyright Law. In accordance with Title 17 U.S.C. Section 107, the material on this site is distributed without profit to those who have expressed a prior interest in receiving the included information for research and educational purposes. For more information go to: http://www.law.cornell.edu/uscode/17/107.shtml. If you wish to use copyrighted material from this site for purposes of your own that go beyond 'fair use', you must obtain permission from the copyright owner.