跟进：Swift天文台再入时刻提前至11月4日：太空军预测美东凌晨3时30分前后、误差11小时

美国航天局（NASA）11月2日更新说，尼尔·格雷尔斯 Swift 天文台预计于11月4日（周三）再入地球大气层，比此前预估的11月6日前后提前。截至周一，美国太空军预测，这颗重约3,200磅（约1.45吨）的航天器将于美东时间11月4日凌晨3时30分前后（美西时间0时30分前后）再入，不确定范围为正负11小时。

NASA 表示，航天器绝大部分将在穿越大气层时燃烧殆尽，但预计仍有部分部件能够存留。由于 Swift 轨道倾角较低，残存碎片的可能落点被限定在南纬20.6度至北纬20.6度之间，具体位置取决于再入时刻；碎片对地面任何人造成伤害的风险约为2,100分之一，可能性很低。NASA 与太空军将继续监测这次再入并更新预测。

Swift 于2004年发射升空，是首台同类多波段天文台，专为研究宇宙中最强的爆炸——伽马射线暴而设计，能以三台望远镜在伽马射线、X射线、紫外与可见光波段快速指向短暂的爆发现象。它原定主任务只有两年，实际运行了二十多年，观测对象从超大质量黑洞驱动的活动星系、恒星的X射线耀发，到超新星爆发，以及太阳系内的彗星与小行星。

关联：Swift天文台预计11月6日前后再入大气层：22年探测逾2000次伽马暴，残骸料坠大洋

Follow-up: Swift Observatory Reentry Moved Up to Nov. 4: Space Force Predicts About 3:30 a.m. EST, Within 11 Hours

NASA said on Nov. 2 that the Neil Gehrels Swift Observatory is expected to re-enter Earth's atmosphere on Wednesday, Nov. 4, earlier than the previous estimate of around Nov. 6. As of Monday, the U.S. Space Force predicted that the roughly 3,200-pound spacecraft will re-enter at about 3:30 a.m. EST on Nov. 4 (12:30 a.m. PST), with an uncertainty of plus or minus 11 hours.

NASA said most of the spacecraft will burn up as it travels through the atmosphere, but some components are expected to survive. Because of Swift's low orbital inclination, surviving fragments are limited to between 20.6 degrees south latitude and 20.6 degrees north latitude, with the exact location depending on when it re-enters; the risk of harm to anyone on Earth is about 1 in 2,100, which NASA described as unlikely. NASA and the Space Force will continue to monitor the re-entry and update predictions.

Launched in 2004, Swift was a first-of-its-kind multiwavelength observatory designed to study gamma-ray bursts, the most powerful explosions in the cosmos, rapidly pointing its three telescopes at short-lived outbursts across gamma-ray, X-ray, ultraviolet and optical light. Originally designed for a two-year prime mission, it operated for more than two decades, observing everything from active galaxies powered by supermassive black holes and stars undergoing X-ray flares to supernova explosions and comets and asteroids in our own solar system.

Related: Swift Observatory Expected to Re-enter Around Nov. 6 After 22 Years and More Than 2,000 Gamma-Ray Bursts

来源：美国航天局

发布：GSM·美国（发布链接）

图片来源：图片来源：NASA科学可视化工作室（SVS），公共领域（Swift天文台在轨示意图） / Image: NASA Scientific Visualization Studio (public domain)

GSM Global · 本篇英文版 English edition of this story

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