Theδ-Cancrid meteoroid stream forms four active meteor showers which are observable on the Earth annually during January–February and August–September.The stream's definite parent comet has not been established...Theδ-Cancrid meteoroid stream forms four active meteor showers which are observable on the Earth annually during January–February and August–September.The stream's definite parent comet has not been established.We performed a search for near-Earth asteroids(NEAs)associated with this stream.We have followed the backward evolution of the orbital elements of a sample of NEAs and found their orbits at the Earth-crossing positions.Using these orbits,we calculated the theoretical parameters of meteor showers associated with the considered NEAs.We carried out our search for observable active showers that match theoretically predicted ones with published data,and the result turned out that the predicted meteor showers of 13 NEAs were identified with the active showers produced by theδ-Cancrid meteoroid stream.The comet-like orbits of NEAs and established association with active meteor showers indicate their common cometary origin.The NEAs considered are moving within the stream and likely represent the dormant remnants of a parent comet of theδ-Cancrid asteroid-meteoroid complex that disintegrated more than 12 thousand years ago.展开更多
基金the support from the National Key R&D Intergovernmental Cooperation Program(2023YFE0102300/2022YFE0133700)the Regional Collaborative Innovation Project of Xinjiang(2022E01013)+1 种基金the National Natural Science Foundation of China(12173078)the“Belt and Road”Innovative Talent Exchange Program(DL2023046004)。
文摘Theδ-Cancrid meteoroid stream forms four active meteor showers which are observable on the Earth annually during January–February and August–September.The stream's definite parent comet has not been established.We performed a search for near-Earth asteroids(NEAs)associated with this stream.We have followed the backward evolution of the orbital elements of a sample of NEAs and found their orbits at the Earth-crossing positions.Using these orbits,we calculated the theoretical parameters of meteor showers associated with the considered NEAs.We carried out our search for observable active showers that match theoretically predicted ones with published data,and the result turned out that the predicted meteor showers of 13 NEAs were identified with the active showers produced by theδ-Cancrid meteoroid stream.The comet-like orbits of NEAs and established association with active meteor showers indicate their common cometary origin.The NEAs considered are moving within the stream and likely represent the dormant remnants of a parent comet of theδ-Cancrid asteroid-meteoroid complex that disintegrated more than 12 thousand years ago.
