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A | 据应急管理部网站消息，4月23日，国家防总办公室、应急管理部继续组织中国气象局、水利部、自然资源部等相关部门开展联合会商，视频调度广东、广西、福建等省份，研判雨情汛情发展态势，部署重点地区防汛救灾和次生灾害防范应对工作。 Washington, Oct 12 (UNI) American space agency NASA says its recent attempt to deflect the path of an asteroid was successful, after its Dart probe struck an asteroid head-on.
Scientists have now confirmed the orbit of a 160m-wide space rock known as Dimorphos was altered when the Dart probe struck it head on last month.
Researchers came to the conclusion after making measurements using a range of space and Earth-based telescopes.
The mission was conceived to test a potential strategy to defend the Earth against threatening objects.
Dart's achievement proves such an idea would work, provided it was initiated early enough and the target wasn't overly massive.
"This mission shows that Nasa is trying to be ready for whatever the Universe throws at us," said agency administrator Bill Nelson.
"I believe that Nasa has proven that we are serious as a defender of the planet," he told reporters.
The space agency released a raft of data on Tuesday to support its assessment, including new pictures from the Hubble Space Telescope and from a small Italian spacecraft that stood off from the impact by about 50km (30 miles).
The Double Asteroid Redirection Test (Dart) took place some 11 million km (7 million miles) from Earth.
It saw the refrigerator-sized Nasa satellite drive straight into Dimorphos at 22,000km/h (14,000mph), destroying itself in the process.
The space rock orbits a much larger (780m wide; 2,550ft) object called Didymos. Before impact, the time taken for Dimorphos to make one circuit of its sibling was 11 hours and 55 minutes.
The telescope evidence now indicates this orbital period has been reduced to 11 hours and 23 minutes - a change of 32 minutes. This corresponds to Dimorphos moving closer into to Didymos by "tens of metres".
Nasa had defined a minimum successful period change of Dimorphos of 73 seconds or more. The results released on Tuesday show Dart surpassed this benchmark by more than 25 times.
"This is a 4 percent change in the orbital period of Dimorphos around Didymos. Dart just gave it a small nudge. But if you wanted to do this in the future, you'd want to do it years in advance," commented Nancy Chabot from the Johns Hopkins University Applied Physics Laboratory, which led the mission for Nasa.
"Warning time is really key here in order to enable this sort of asteroid deflection to be used in the future as part of a much larger planetary defence strategy."
Nasa's Dart programme scientist, Tom Statler, also had a word of caution about drawing too many conclusions from the experiment.
Asteroids came in many different guises, he said. Their compositions and constructions were diverse - something that was being emphasised every time a mission visited a new object.
"We should not be too eager to say one test on one asteroid tells us exactly how every other asteroid would behave in a similar situation," he stressed.
"But what we can do is use this test as an anchor point for our physics calculations in our simulations that tell us how different kinds of impacts in different situations should behave."
Four years from now, the European Space Agency (Esa) will have three spacecraft - collectively known as the Hera mission - at Didymos and Dimorphos to make follow-up studies.
UNI ING。　　会商指出，4月23日8时至24日8时，广东南部、福建东南部等地部分地区有大到暴雨，广东东南部沿海等地局地有大暴雨；24日夜间至26日，广东省仍有较强降雨，中北部发生洪涝、地质灾害的风险高。

B | 有关地区要进一步提高工作精准性，针对性研判洪涝和地质灾害防御形势，及时高效处置突发险情灾情，精细做好救援排查和救灾救助等工作。　　目前，国家防总办公室派出的工作组仍在清远、肇庆、韶关等地协助指导，应急管理部增派工作组赴广东省指导地质灾害应急处置，调派国家自然灾害防治研究院专家携带巡堤查险设备在清远市佛冈县潖江流域凤洲围堤、北江大堤石角段开展无人机巡堤查险和光纤堤防险情监测作业，并根据汛情险情，机动部署巡堤查险。国家防总办公室、应急管理部对接地方需求，指导广东省落实中央企业工程抢险力量63支5164人、1799台套装备，利用无人机恢复部分失联村庄通信，调派大型无人机增援灾区，协调做好应急通信保障。经各方全力抢险救援，目前进入韶关市武江区江湾镇的通道已全面打通，前期6个失联村庄均已取得联系，村组人员基本生活有保障。

C | 4月21日至22日，国家综合性消防救援队伍共参与抗洪抢险340起，出动消防救援指战员2554人次，车辆444辆次、舟艇245艘次，营救遇险被困群众170人。　　（中国小康网综合应急管理部网站）。

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