Elemental composition from gamma-ray spectroscopy of the NEAR-Shoemaker landing site on 433 Eros

被引：55

作者：

Evans, LG ^{[1
]}

Starr, RD

Brückner, J

Reedy, RC

Boynton, WV

Trombka, JI

Goldstein, JO

Masarik, J

Nittler, LR

McCoy, TJ

机构：

[1] Comp Sci Corp, Sci Programs, Lanham, MD 20706 USA

[2] Catholic Univ Amer, Dept Phys, Washington, DC 20064 USA

[3] Max Planck Inst Chem, D-55020 Mainz, Germany

[4] Los Alamos Natl Lab, Los Alamos, NM 87545 USA

[5] Univ Arizona, Lunar & Planetary Lab, Tucson, AZ 85721 USA

[6] NASA, Goddard Space Flight Ctr, Extraterr Phys Lab, Greenbelt, MD 20771 USA

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

[8] Smithsonian Inst, Natl Museum Nat Hist, Dept Mineral Sci, Washington, DC 20560 USA

来源：

METEORITICS & PLANETARY SCIENCE | 2001年 / 36卷 / 12期

关键词：

D O I：

10.1111/j.1945-5100.2001.tb01854.x

中图分类号：

P3 [地球物理学]; P59 [地球化学];

学科分类号：

0708 ; 070902 ;

摘要：

Elemental composition and composition ratios derived from gamma-ray measurements collected by the NEAR-Shoemaker spacecraft while on the surface of 433 Eros are reported. Performance of the gamma-ray spectrometer (GRS) during cruise and orbit is reviewed. The best gamma-ray data were collected on the surface of Eros after the spacecraft's controlled descent on 2001 February 12. Methods used in spectral analysis, to convert peak areas to incident photons, and photons to elemental composition are described in some detail. The elemental abundance of K and the Mg/Si, Fe/Si, Si/O and Fe/O abundance ratios were determined. The Mg/Si and Si/O ratios and the K abundance are roughly chondritic, but the Fe/Si and Fe/O ratios are low compared to expected chondritic values. Three possible explanations for the apparent Fe depletion are considered.

引用

页码：1639 / 1660

页数：22