^1,2Lei Jin,³Tsz Wai Lo,³Ian Tong Fong
Research in Astronom and Astrophysics 25, 075008 Link to Article [DOI 10.1088/1674-4527/add8fa]
¹State Key Laboratory of Lunar and Planetary Sciences, Macau University of Science and Technology, Macau 999078, China
²CNSA Macau Center for Space Exploration and Science, Macau 999078, China
³Premier School Affiliated to Hou Kong Middle School, Macau 999078, China

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¹Pengyue Wang (王鹏越),²Edward Cloutis,¹Ye Su (苏烨),¹Man-To Hui (许文韬)
The Astrophysical Journal Letters 985, L18 Open Access Link to Article [DOI 10.3847/2041-8213/adce6e]
¹State Key Laboratory of Lunar and Planetary Sciences, Macau University of Science and Technology, Macau, People’s Republic of China
²Department of Geography, University of Winnipeg, Winnipeg, Canada

Most near-Earth objects are thought to originate from the collisional fragments of the main asteroid belt. One question that remains to be resolved is the proportion of near-Earth objects sampling the core area material of the parent body to the outer layers. In this study, we developed a method to determine the petrologic type of ordinary chondrite parent bodies based on reflectance spectroscopy. We also calculated the petrologic type of asteroid (25143) Itokawa, which is consistent with the returned samples from the JAXA Hayabusa mission. Finally, we calculate the petrologic type of 28 LL near-Earth asteroids. Our results show that the surface material of most LL chondrite near-Earth asteroids is of petrologic grade higher than 4. The ratio of LL chondrite near-Earth asteroids with high petrologic type (5 and 6) to LL chondrite near-Earth asteroids with low petrologic type is 0.79. This also means that LL chondrite near-Earth asteroids may originate primarily from the core area of the main belt parent body or bodies.