Elemental compositional from gamma-ray spectroscopy of the NEAR-shoemaker landing site on 433 Eros

Larry G. Evans; Richard D. Starr; Johannes Brückner; Robert C. Reedy; William V. Boynton; Jacob I. Trombka; John O. Goldsten; Jozef Masarik; Larry R. Nittler

doi:10.1111/j.1945-5100.2001.tb01854.x

Elemental compositional from gamma-ray spectroscopy of the NEAR-shoemaker landing site on 433 Eros

Larry G. Evans, Richard D. Starr, Johannes Brückner, Robert C. Reedy, William V. Boynton, Jacob I. Trombka, John O. Goldsten, Jozef Masarik, Larry R. Nittler

Lunar and Planetary Lab

Research output: Contribution to journal › Article › peer-review

58 Scopus citations

Abstract

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.

Original language	English (US)
Pages (from-to)	1639-1660
Number of pages	22
Journal	Meteoritics and Planetary Science
Volume	36
Issue number	12
DOIs	https://doi.org/10.1111/j.1945-5100.2001.tb01854.x
State	Published - 2001

ASJC Scopus subject areas

Geophysics
Space and Planetary Science

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10.1111/j.1945-5100.2001.tb01854.x

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title = "Elemental compositional from gamma-ray spectroscopy of the NEAR-shoemaker landing site on 433 Eros",

abstract = "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.",

author = "Evans, {Larry G.} and Starr, {Richard D.} and Johannes Br{\"u}ckner and Reedy, {Robert C.} and Boynton, {William V.} and Trombka, {Jacob I.} and Goldsten, {John O.} and Jozef Masarik and Nittler, {Larry R.}",

year = "2001",

doi = "10.1111/j.1945-5100.2001.tb01854.x",

language = "English (US)",

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pages = "1639--1660",

journal = "Meteoritics and Planetary Science",

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publisher = "The University of Arkansas Press",

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T1 - Elemental compositional from gamma-ray spectroscopy of the NEAR-shoemaker landing site on 433 Eros

AU - Evans, Larry G.

AU - Starr, Richard D.

AU - Brückner, Johannes

AU - Reedy, Robert C.

AU - Boynton, William V.

AU - Trombka, Jacob I.

AU - Goldsten, John O.

AU - Masarik, Jozef

AU - Nittler, Larry R.

PY - 2001

Y1 - 2001

N2 - 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.

AB - 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.

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IS - 12

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Elemental compositional from gamma-ray spectroscopy of the NEAR-shoemaker landing site on 433 Eros

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