On October 26, 2010 (September 19, 2010 in the lunar calendar), the Chang'e-2 satellite successfully entered the lunar rainbow bay imaging orbit. Chart: "Chang'e-2" successfully entered the lunar rainbow bay imaging orbit Xinhua Agency issued Xinhuanet, Beijing, October 26 (Reporters Tian Zhaoyun, Jiang Ning) At 21:27 on the 26th, the Beijing Space Flight Control Center implemented the down-orbit control on the Chang'e-2 satellite. About 18 minutes later, the satellite successfully entered the test orbit of 100 kilometers on the far moon and 15 kilometers on the near moon, preparing for taking images in the lunar rainbow bay area. The reporter saw from the large screen in the hall of Beijing Aerospace Flight Control Center that after the control command was issued, the three-dimensional animation showed that four small engines on the satellite sprayed dazzling flames at the same time. According to the real-time telemetry data, the orbit descent achieved the expected effect. In order to ensure that control is foolproof, the Beijing Aerospace Flight Control Center adopts asymmetric orbit control technology to effectively solve technical problems such as low altitude of the near-moon point, invisible measurement and control, and the rapid decline of the near-moon point in the lunar gravitational field has a great impact on the orbit. Control reliability. According to Zhou Jianliang, deputy chief engineer of the Beijing Aerospace Flight Control Center, the lower orbit is to bring the satellite closer to the moon so as to provide high-resolution imaging of the lunar rainbow area. On the evening of the 26th, the control of 15 kilometers near the lunar point was implemented, which put forward extremely high requirements for control accuracy. Under the influence of the lunar gravitational field, the perimonthly point of the satellite orbit drops rapidly, prone to orbital drift. In addition, when the engine is ignited for orbit change, the satellite is located on the back of the moon and is in a "blind control" state, which greatly increases the difficulty and risk of control. If the engine is not turned off in time and the control amount is inaccurate, the satellite will hit the moon or deviate from orbit, causing the mission to fail. It is reported that starting from the 27th, the CCD camera on the Chang'e-2 satellite will take photos of the Moon's Rainbow Bay Area. Comments: This step of China's Space Orbiting the Moon Program has successfully completed the planned task. Congratulations to China Aerospace.