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http://news.sciencenet.cn/htmlnews/2011/9/253237.shtm 美国航天局确认报废卫星坠入南太平洋美国航天局9月27日说，已报废的“高层大气研究卫星”已坠入南太平洋远离大陆的地区，并未造成人员和财产损失。美国航天局说，负责跟踪卫星下坠过程的范登堡空军基地空间联合作战指挥中心确认，美国东部时间24日零时，这颗卫星开始从南纬14.1度、西经170.2度对应地点上空进入地球大气层，其碎片散落在半径为480公里至1300公里的范围内。上述坐标对应的地点位于萨摩亚附近。美国航天局说，“（卫星进入大气层的）地点位于南半球广阔、遥远的海洋区域上空，远离所有陆地人群”，未接到任何在这一区域观测到碎片的报告。美国航天局轨道碎片专家马克·马特尼认为，这是地球上相对无人居住的区域，从风险角度而言是卫星坠落的好地点。此前有人称，部分卫星碎片可能坠落至加拿大西北地区，还有人在互联网上宣称在加拿大发现碎片。不过美国航天局表示，根据最新计算结果，卫星坠落时间比预想的提前几分钟，其碎片分布范围应该在南半球。美国航天局表示，这是该局就“高层大气研究卫星”的状况发布的最终更新报告。美国航天局此前估计，卫星进入大气层后大部分将燃烧殆尽，但仍将有总重为500公斤的26个碎片残留并最终落在地球表面上。其中，最大碎片重量可达150公斤。卫星坠地消息一度引发人们对人身财产安全的担忧。 “高层大气研究卫星”重6吨，1991年由航天飞机送入环地轨道。在卫星燃料耗尽后，美国航天局失去对它的有效控制，只能任其自行回落地球。昨晚等到两点多，最后一次更新还是确定不了最后的地点，不过已经确定不会经过中国和我这里了，我就睡了，最后的更新没有跟上，不好意思。不过NASA这次的跟踪有些让人失望，没有做到之前承诺的提前两个小时预报时间和地点，甚至知道已经落了，但迄今还是不知道到底掉哪里了。网上尚没有看到有关目击的报告。关注了几个星期了，这样结束，有些遗憾。期待能看到有人拍到照片或者视频。美国宇航局（NASA）于1991年送上轨道的一颗6吨重的人造卫星UARS，将于本月底重返地球的怀抱。没有人能够预先知道上层大气研究卫星（UARS）的残骸到底会击中哪里，但历史和大量计算表明，它对于人类的风险真的极低。但是，如果能够亲眼目睹，将是壮观的火流星雨！十分期待此贴实时更新来自NASA的最新观测计算结果：(北京时间比下面的EDT快12个小时) Update #16 Sat, 24 Sep 2011 15:37:25 GMT NASA’s decommissioned Upper Atmosphere Research Satellite fell back to Earth between 11:23 p.m. EDT Friday, Sept. 23 and 1:09 a.m. EDT Sept. 24. The Joint Space Operations Center at Vandenberg Air Force Base in California said the satellite entered the atmosphere over the North Pacific Ocean, off the west coast of the United States. The precise re-entry time and location of any debris impacts are still being determined. NASA is not aware of any reports of injury or property damage. This is your source for official information on the re-entry of UARS. All information posted here has been verified with a government agency or law enforcement. NASA will conduct a media telecon at 2 p.m. ET to discuss the re-entry. The telecon will be streamed live at www.nasa.gov/newsaudio. Update #16 Sat, 24 Sep 2011 15:37:01 GMT NASA’s decommissioned Upper Atmosphere Research Satellite fell back to Earth between 11:23 p.m. EDT Friday, Sept. 23 and 1:09 a.m. EDT Sept. 24. The Joint Space Operations Center at Vandenberg Air Force Base in California said the satellite entered the atmosphere over the North Pacific Ocean, off the west coast of the United States. The precise re-entry time and location of any debris impacts are still being determined. NASA is not aware of any reports of injury or property damage. This is your source for official information on the re-entry of UARS. All information posted here has been verified with a government agency or law enforcement. NASA will conduct a media telecon at 2 p.m. ET to discuss the re-entry. The telecon will be streamed live at www.nasa.gov/newsaudio. Update #15 Sat, 24 Sep 2011 15:36:27 GMT NASA’s decommissioned Upper Atmosphere Research Satellite fell back to Earth between 11:23 p.m. EDT Friday, Sept. 23 and 1:09 a.m. EDT Sept. 24. The Joint Space Operations Center at Vandenberg Air Force Base in California said the satellite entered the atmosphere over the North Pacific Ocean, off the west coast of the United States. The precise re-entry time and location of any debris impacts are still being determined. NASA is not aware of any reports of injury or property damage. This is your source for official information on the re-entry of UARS. All information posted here has been verified with a government agency or law enforcement. NASA will conduct a media telecon at 2 p.m. ET to discuss the re-entry. The telecon will be streamed live at www.nasa.gov/newsaudio. Update #15 Sat, 24 Sep 2011 07:46:42 GMT NASA’s decommissioned Upper Atmosphere Research Satellite fell back to Earth between 11:23 p.m. EDT Friday, Sept. 23 and 1:09 a.m. EDT Sept. 24. The Joint Space Operations Center at Vandenberg Air Force Base in California said the satellite penetrated the atmosphere over the Pacific Ocean. The precise re-entry time and location are not yet known with certainty. Update #14 Sat, 24 Sep 2011 07:16:50 GMT NASA’s decommissioned Upper Atmosphere Research Satellite fell back to Earth between 11:23 p.m. EDT Friday, Sept. 23 and 1:09 a.m. EDT Sept. 24. The satellite was passing eastward over Canada and Africa as well as vast portions of the Pacific, Atlantic and Indian oceans during that period. The precise re-entry time and location are not yet known with certainty. Update #13 Sat, 24 Sep 2011 04:55:17 GMT As of 10:30 p.m. EDT on Sept. 23, 2011, the orbit of UARS was 85 miles by 90 miles (135 km by 140 km). Re-entry was expected between 11:45 p.m. Friday, Sept. 23, and 12:45 a.m., Sept. 24, Eastern Daylight Time (3:45 a.m. to 4:45 a.m. GMT). During that time period, the satellite was passing over Canada and Africa, as well as vast areas of the Pacific, Atlantic and Indian oceans. The risk to public safety was very remote. NASA is working to confirm the re-entry location and time and will provide an update shortly. Update #12 Sat, 24 Sep 2011 02:50:07 GMT As of 10:30 p.m. EDT on Sept. 23, 2011, the orbit of UARS was 85 miles by 90 miles (135 km by 140 km). Re-entry is expected between 11:45 p.m. Friday, Sept. 23, and 12:45 a.m., Sept. 24, Eastern Daylight Time (3:45 a.m. to 4:45 a.m. GMT). During that time period, the satellite will be passing over Canada and Africa, as well as vast areas of the Pacific, Atlantic and Indian oceans. The risk to public safety is very remote. Update #11 Fri, 23 Sep 2011 23:30:18 GMT As of 7 p.m. EDT on Sept. 23, 2011, the orbit of UARS was 90 miles by 95 miles (145 km by 150 km). Re-entry is expected between 11 p.m. Friday, Sept. 23, and 3 a.m., Sept. 24, Eastern Daylight Time (3 a.m. to 7 a.m. GMT). During that time period, the satellite will be passing over Canada, Africa and Australia, as well as vast areas of the Pacific, Atlantic and Indian oceans. The risk to public safety is very remote. Beth Dickey Public Affairs Officer NASA Headquarters Phone: 202-358-2087 Update #10 Fri, 23 Sep 2011 04:45:08 PM GMT+0200 As of 10:30 a.m. EDT on Sept. 23, 2011, the orbit of UARS was 100 miles by 105 miles (160 km by 170 km). Re-entry is expected late Friday, Sept. 23, or early Saturday, Sept. 24, Eastern Daylight Time. Solar activity is no longer the major factor in the satellite’s rate of descent. The satellite’s orientation or configuration apparently has changed, and that is now slowing its descent. There is a low probability any debris that survives re-entry will land in the United States, but the possibility cannot be discounted because of this changing rate of descent. It is still too early to predict the time and location of re-entry with any certainty, but predictions will become more refined in the next 12 to 18 hours. Update #9 from UARS Mission Updates As of 9:30 p.m. EDT Sept. 22, 2011, the orbit of UARS was 110 mi by 115 mi (175 km by 185 km). Re-entry is possible sometime during the afternoon or early evening of Sept. 23, Eastern Daylight Time. The satellite will not be passing over North America during that time period. It is still too early to predict the time and location of re-entry with any more certainty, but predictions will become more refined in the next 24 hours. 19:53 (2 hours ago) Update #8 from UARS Mission Updates As of 7 a.m. EDT Sept. 22, 2011, the orbit of UARS was 115 mi by 120 mi (185 km by 195 km). Re-entry is expected sometime during the afternoon of Sept. 23, Eastern Daylight Time. The satellite will not be passing over North America during that time period. It is still too early to predict the time and location of re-entry with any more certainty, but predictions will become more refined in the next 24 to 36 hours. 12:53 AM Update #7 from UARS Mission Updates As of 1:30 p.m. EDT Sept. 21, 2011, the orbit of UARS was 120 mi by 130 mi (190 km by 205 km). Re-entry is expected sometime during the afternoon of Sept. 23, Eastern Daylight Time. The satellite will not be passing over North America during that time period. It is still too early to predict the time and location of re-entry with any more certainty, but predictions will become more refined in the next 24 to 48 hours. Sep 21, 2011 (yesterday) Update #6 from UARS Mission Updates As of Sept. 21, 2011, the orbit of UARS was 120 mi by 130 mi (195 km by 210 km). Re-entry is expected Sept. 23, United States time. The time reference does not mean that the satellite is expected to re-enter over the United States. It is simply a time reference. Although it is still too early to predict the time and location of re-entry, predictions of the time period are becoming more refined. Sep 21, 2011 (yesterday) Update #6 from UARS Mission Updates 1 person liked this As of Sept. 20, 2011, the orbit of UARS was 120 mi by 130 mi (195 km by 210 km). Re-entry is expected Sept. 23, United States time. The time reference does not mean that the satellite is expected to re-enter over the United States. It is simply a time reference. Although it is still too early to predict the time and location of re-entry, predictions of the time period are becoming more refined. Sep 20, 2011 (2 days ago) Update #6 from UARS Mission Updates As of Sept. 20, 2011, the orbit of UARS was 127 mi by 140 mi (205 km by 225 km). Re-entry is expected Sept. 23, plus or minus a day. It is still too early to predict the time and location of re-entry. Predictions will become more refined over the next two days. Sep 19, 2011 (3 days ago) Update #5 from UARS Mission Updates As of Sept. 19, 2011, the orbit of UARS was 130 mi by 143 mi (210 km by 230 km). Re-entry is expected Sept. 23, plus or minus a day. Sep 18, 2011 (4 days ago) Update #4 from UARS Mission Updates As of Sept. 18, 2011, the orbit of UARS was 133 mi by 149 mi (215 km by 240 km). Re-entry is expected Sept. 23, plus or minus a day. Sep 16, 2011 (6 days ago) Update #3 from UARS Mission Updates As of Sept. 16, 2011, the orbit of UARS was 140 mi by 155 mi (225 km by 250 km). Re-entry is expected Sept. 23, plus or minus a day. The re-entry of UARS is advancing because of a sharp increase in solar activity since the beginning of this week. Sep 15, 2011 3:28 PM Update #2 from UARS Mission Updates As of Sept. 15, 2011, the orbit of UARS was 143 mi by 158 mi (230 km by 255 km). Re-entry is expected Sept. 24, plus or minus a day. Sep 15, 2011 3:20 PM Update #2 from UARS Mission Updates As of Sept. 15, 2011, the orbit of UARS was 143 mi by 158 mi (230 km by 255 km). Re-entry is expected Sept. 23-24, plus or minus a day. Sep 12, 2011 3:18 PM Update #1 from UARS Mission Updates As of Sept. 12, 2011, the orbit of UARS was 145 mi by 165 mi (235 km by 265 km). Re-entry is expected during the last week of September. 关于该卫星的一些信息: http://umpgal.gsfc.nasa.gov/ http://en.wikipedia.org/wiki/Upper_Atmosphere_Research_Satellite 科学网: http://news.sciencenet.cn/htmlnews/2011/9/252488.shtm http://news.sciencenet.cn/htmlnews/2011/9/252938.shtm

美国UARS卫星坠落预测实时更新 #16