Anna Zappatini, Edwin Gnos, Beda A. Hofmann, Urs Eggenberger, Pascal M. Kruttasch, Frank Gfeller, Mohammad Tauseef, Ingo Leya, Hadrien A. R. Devillepoix, Eleanor K. Sansom, Martin Cupák, Sophie E. Deam, Thomas W. C. Stevenson, Peter Jenniskens, Sebastian Lindemann, Beat Booz, Muati. S. Al-Muati, Abdulmunaim A. Al-Zakwani, Hussain A. Al-Ghafri
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Gamma spectrometry confirmed their young terrestrial age via short-lived cosmogenic radionuclides <sup>54</sup>Mn and <sup>22</sup>Na. Al-Khadhaf is thus the first camera-observed meteorite fall from Oman. Petrography and mineral composition classify it as an ordinary H5–6 S2 W1 chondrite. Its pre-impact orbit (<i>a</i> = 1.72 AU, <i>e</i> = 0.45, <i>i</i> = 4.36°) is consistent with asteroid-belt delivery, with both inner-belt and Koronis-family sources remaining plausible. The cosmic ray exposure age of 8.57 ± 1.2 Ma coincides with an exposure-age peak observed among H chondrites. Al-Khadhaf adds to the record of camera-observed falls, linking meteorite compositions to their solar system context via orbit calculations.</p>","PeriodicalId":18555,"journal":{"name":"Meteoritics & Planetary Science","volume":"61 3","pages":"522-547"},"PeriodicalIF":2.4000,"publicationDate":"2026-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/maps.70110","citationCount":"0","resultStr":"{\"title\":\"Al-Khadhaf: The first camera-observed (H5–6) meteorite fall from Oman\",\"authors\":\"Anna Zappatini, Edwin Gnos, Beda A. Hofmann, Urs Eggenberger, Pascal M. Kruttasch, Frank Gfeller, Mohammad Tauseef, Ingo Leya, Hadrien A. R. Devillepoix, Eleanor K. Sansom, Martin Cupák, Sophie E. Deam, Thomas W. C. Stevenson, Peter Jenniskens, Sebastian Lindemann, Beat Booz, Muati. S. Al-Muati, Abdulmunaim A. Al-Zakwani, Hussain A. 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引用次数: 0
摘要
作为全球火球天文台(GFO)的一部分,阿曼陨石监测项目(OMMP)于2022年安装了一个火球相机系统,该系统于2022年3月8日晚上8点15分记录下了一个3.2秒的火球。一个4±2公斤重的流星体以14.0公里/秒的速度进入大气层。它的轨道斜率为68.4°,起点为67.6公里,终点为30.2公里,流星体以7.36公里/秒的速度运行。大约50克在进入大气层后幸存下来。2023年2月7日,在预测地点发现了两颗分别为13.85 g和8.21 g的陨石。伽马能谱法通过短寿命的宇宙放射性核素54Mn和22Na证实了它们年轻的地球年龄。因此,哈达夫是第一个被相机观测到的来自阿曼的陨石。岩石学和矿物成分分类为普通H5-6 S2 W1球粒陨石。它的撞击前轨道(a = 1.72 AU, e = 0.45, i = 4.36°)与小行星带的发射一致,小行星带内部和koronis家族的来源都是可信的。宇宙射线暴露年龄为8.57±1.2 Ma,与H球粒陨石的暴露年龄峰值相吻合。Al-Khadhaf补充了相机观测到的陨落记录,通过轨道计算将陨石成分与太阳系背景联系起来。
Al-Khadhaf: The first camera-observed (H5–6) meteorite fall from Oman
A fireball camera system installed in 2022 by the Oman Meteorite Monitoring Project (OMMP) as part of the Global Fireball Observatory (GFO) recorded a 3.2 s fireball on March 8, 2022 at 8:15 p.m. UTC. A meteoroid of 4 ± 2 kg entered the atmosphere at 14.0 km/s. Its trajectory, with a slope of 68.4°, started at 67.6 km and ended at 30.2 km where the meteoroid traveled at 7.36 km/s. Approximately 50 g survived atmospheric entry. On February 7, 2023, two meteorites of 13.85 g and 8.21 g were recovered at the predicted site. Gamma spectrometry confirmed their young terrestrial age via short-lived cosmogenic radionuclides 54Mn and 22Na. Al-Khadhaf is thus the first camera-observed meteorite fall from Oman. Petrography and mineral composition classify it as an ordinary H5–6 S2 W1 chondrite. Its pre-impact orbit (a = 1.72 AU, e = 0.45, i = 4.36°) is consistent with asteroid-belt delivery, with both inner-belt and Koronis-family sources remaining plausible. The cosmic ray exposure age of 8.57 ± 1.2 Ma coincides with an exposure-age peak observed among H chondrites. Al-Khadhaf adds to the record of camera-observed falls, linking meteorite compositions to their solar system context via orbit calculations.
期刊介绍:
First issued in 1953, the journal publishes research articles describing the latest results of new studies, invited reviews of major topics in planetary science, editorials on issues of current interest in the field, and book reviews. The publications are original, not considered for publication elsewhere, and undergo peer-review. The topics include the origin and history of the solar system, planets and natural satellites, interplanetary dust and interstellar medium, lunar samples, meteors, and meteorites, asteroids, comets, craters, and tektites. Our authors and editors are professional scientists representing numerous disciplines, including astronomy, astrophysics, physics, geophysics, chemistry, isotope geochemistry, mineralogy, earth science, geology, and biology. MAPS has subscribers in over 40 countries. Fifty percent of MAPS'' readers are based outside the USA. The journal is available in hard copy and online.