Integrating available instrumental records with meteorite analysis could build a link between meteorite chemical groups and their original parent bodies.However,such comprehensive source region-tracing studies have no...Integrating available instrumental records with meteorite analysis could build a link between meteorite chemical groups and their original parent bodies.However,such comprehensive source region-tracing studies have not been conducted for any meteorite fall events in China.On 2022 December 15 at 09:48 UT,meteoroid Tanxi was recorded by numerous cameras in populous northern Zhejiang.This event offers an opportunity to conduct the first systematic origin-tracing study for a meteorite fall event in China.The Tanxi meteorite was classified as an H6chondrite.This meteoroid entered the atmosphere with a velocity of 13.49 km s^(-1)and a slope of 69.52°.It most likely underwent a two-stage fragmentation process,with early fragmentation under a dynamic pressure of0.08 MPa,and main fragmentation under a dynamic pressure of 7.83 MPa.Before colliding with the Earth,the meteoroid’s heliocentric orbit had a semimajor axis of 2.363±0.107 au,an eccentricity of 0.584±0.019 and an inclination of 2.078±0.074°.A backward Dshevolution result of 5000 yr shows Tanxi’s orbit is most similar to a small near-Earth asteroid 2016 WV2.The source region analysis of the Tanxi fall indicates that the H chondrites could originate from two distinct reservoirs:the 3:1J mean motion resonance complex(51.2±3.7%)and the v6secular resonance region(41.6±2.9%).展开更多
基金supported by the National Key Research and Development Program of China(2023YFE0109900)the B-type Strategic Priority Research Program of Chinese Academy of Sciences(grant No.XDB 41000000)+4 种基金the National Natural Science Foundation of China(grant Nos.42273038,62227901,42073060 and 12150009)Space debris and NEO research project(No.KJSP2020020204)Youth Innovation Promotion Association CAS(2023332)the Science and Technology Project of Qinghai Province(2025-ZJ-T0)the Minor Planet Foundation of China.
文摘Integrating available instrumental records with meteorite analysis could build a link between meteorite chemical groups and their original parent bodies.However,such comprehensive source region-tracing studies have not been conducted for any meteorite fall events in China.On 2022 December 15 at 09:48 UT,meteoroid Tanxi was recorded by numerous cameras in populous northern Zhejiang.This event offers an opportunity to conduct the first systematic origin-tracing study for a meteorite fall event in China.The Tanxi meteorite was classified as an H6chondrite.This meteoroid entered the atmosphere with a velocity of 13.49 km s^(-1)and a slope of 69.52°.It most likely underwent a two-stage fragmentation process,with early fragmentation under a dynamic pressure of0.08 MPa,and main fragmentation under a dynamic pressure of 7.83 MPa.Before colliding with the Earth,the meteoroid’s heliocentric orbit had a semimajor axis of 2.363±0.107 au,an eccentricity of 0.584±0.019 and an inclination of 2.078±0.074°.A backward Dshevolution result of 5000 yr shows Tanxi’s orbit is most similar to a small near-Earth asteroid 2016 WV2.The source region analysis of the Tanxi fall indicates that the H chondrites could originate from two distinct reservoirs:the 3:1J mean motion resonance complex(51.2±3.7%)and the v6secular resonance region(41.6±2.9%).
