Gravity Field and Internal Structure of Mercury from MESSENGER

被引：223

作者：

Smith, David E. ^{[1
]}

Zuber, Maria T. ^{[1
]}

Phillips, Roger J. ^{[2
]}

Solomon, Sean C. ^{[3
]}

Hauck, Steven A., II ^{[4
]}

Lemoine, Frank G. ^{[5
]}

Mazarico, Erwan ^{[1
,5
]}

Neumann, Gregory A. ^{[5
]}

Peale, Stanton J. ^{[6
]}

Margot, Jean-Luc ^{[7
]}

Johnson, Catherine L. ^{[8
,9
]}

Torrence, Mark H. ^{[5
,10
]}

Perry, Mark E. ^{[11
]}

Rowlands, David D. ^{[5
]}

Goossens, Sander ^{[12
]}

Head, James W. ^{[13
]}

Taylor, Anthony H. ^{[14
]}

机构：

[1] MIT, Dept Earth Atmospher & Planetary Sci, Cambridge, MA 02139 USA

[2] SW Res Inst, Planetary Sci Directorate, Boulder, CO 80302 USA

[3] Carnegie Inst Washington, Dept Terr Magnetism, Washington, DC 20015 USA

[4] Case Western Reserve Univ, Dept Earth Environm & Planetary Sci, Cleveland, OH 44106 USA

[5] NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA

[6] Univ Calif Santa Barbara, Dept Phys, Santa Barbara, CA 93106 USA

[7] Univ Calif Los Angeles, Dept Earth & Space Sci, Los Angeles, CA 90095 USA

[8] Univ British Columbia, Dept Earth & Ocean Sci, Vancouver, BC V6T 1Z4, Canada

[9] Planetary Sci Inst, Tucson, AZ 85719 USA

[10] Stinger Ghaffarian Technol Inc, Greenbelt, MD 20770 USA

[11] Johns Hopkins Univ, Appl Phys Lab, Laurel, MD 20723 USA

[12] Univ Maryland Baltimore Cty, Baltimore, MD 21250 USA

[13] Brown Univ, Dept Geol Sci, Providence, RI 02912 USA

[14] KinetX Inc, Tempe, AZ 85284 USA

来源：

SCIENCE | 2012年 / 336卷 / 6078期

关键词：

MOLTEN CORE; EVOLUTION; TOPOGRAPHY; MARS;

D O I：

10.1126/science.1218809

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Radio tracking of the MESSENGER spacecraft has provided a model of Mercury's gravity field. In the northern hemisphere, several large gravity anomalies, including candidate mass concentrations (mascons), exceed 100 milli-Galileos (mgal). Mercury's northern hemisphere crust is thicker at low latitudes and thinner in the polar region and shows evidence for thinning beneath some impact basins. The low-degree gravity field, combined with planetary spin parameters, yields the moment of inertia C/MR2 = 0.353 +/- 0.017, where M and R are Mercury's mass and radius, and a ratio of the moment of inertia of Mercury's solid outer shell to that of the planet of C-m/C = 0.452 +/- 0.035. A model for Mercury's radial density distribution consistent with these results includes a solid silicate crust and mantle overlying a solid iron-sulfide layer and an iron-rich liquid outer core and perhaps a solid inner core.

引用

页码：214 / 217

页数：4

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