Estimation of the Size and Composition of the Lunar Core Based on the Gravity Field Model GL1500E and LLR Physical Libration Parameters

ZHONG Zhen; ZHANG Teng; DUAN Lian; LI Yi; ZHU Huaqiang

doi:10.13203/j.whugis20190124

Volume 46 Issue 2

Jan. 2021

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Geomatics and Information Science of Wuhan University > 2021 > 46(2): 238-243. > DOI: 10.13203/j.whugis20190124

ZHONG Zhen, ZHANG Teng, DUAN Lian, LI Yi, ZHU Huaqiang. Estimation of the Size and Composition of the Lunar Core Based on the Gravity Field Model GL1500E and LLR Physical Libration Parameters[J]. Geomatics and Information Science of Wuhan University, 2021, 46(2): 238-243. DOI: 10.13203/j.whugis20190124

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Estimation of the Size and Composition of the Lunar Core Based on the Gravity Field Model GL1500E and LLR Physical Libration Parameters

ZHONG Zhen^{1, 2, 3,},
ZHANG Teng¹,
DUAN Lian^{2, 3},
LI Yi¹,
ZHU Huaqiang¹

2.
School of Physics and Electronic Science, Guizhou Normal University, Guiyang 550001, China
2.
School of Natural Resources and Surveying, Nanning Normal University, Nanning 530001, China
3.
Key Laboratory of Environment Change and Resources Use in Beibu Gulf, Ministry of Education, Nanning Normal University, Nanning 530001, China

Funds:

The National Natural Science Foundation of China 41864001

the Open Fund of State Key Laboratory of Information Engineering in Surveying, Mapping and Remote Sensing, Wuhan University 17P03

Guizhou Science and Technology Plan Project Guizhou Science and Technology Platform Talents [2018]5769

the Open Fund of Key Laboratory of Environment Change and Resources Use in Beibu Gulf, Ministry of Education 2015K03

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Author Bio:
ZHONG Zhen, PhD, professor, specializes in application of lunar gravity field model and lunar interior structure. E-mail: zhenzhongmail@163.com
Received Date: November 02, 2019
Published Date: February 04, 2021

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Abstract

The lunar core is stratified into an outer core and an inner core. They can be estimated according to the second degree of gravity field model and selenophysical libration parameters from lunar laser ranging (LLR). We use the high-resolution lunar gravity field model GL1500E to evaluate the size and density of lunar core, which are inversed through a nonlinear particle swarm optimization. A large number of inversion indicates that, the outer diameter of the outer core is about 469 km with a corresponding density of 4 613 kg/m³, the radius of the inner core is around 303 km with a corresponding density of 7 004 kg/m³ and the density of mantle surrounds 3 340 kg/m³, which is quite close to the geological value of 3 360 kg/m³. The radii of inner core and outer core are quite close to other recent studies as well. The size and density of the lunar core found here can be therefore meaningful. If the lunar core is composed of pure iron and ferrous sulfide, our study shows that the inner core is mainly composed of pure iron whereas the outer core is largely composed of ferrous sulfide.

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Estimation of the Size and Composition of the Lunar Core Based on the Gravity Field Model GL1500E and LLR Physical Libration Parameters

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