Sign on

SAO/NASA ADS Astronomy Abstract Service

· Find Similar Abstracts (with default settings below)
· Electronic Refereed Journal Article (HTML)
· References in the article
· Citations to the Article (70) (Citation History)
· Refereed Citations to the Article
· Also-Read Articles (Reads History)
·
· Translate This Page
Title:
Iron alteration minerals in the visible and near-infrared spectra of low-albedo asteroids
Authors:
Vilas, Faith; Jarvis, Kandy S.; Gaffey, Michael J.
Affiliation:
AA(NASA. Johnson Space Center, Houston, TX, US), AB(NASA. Johnson Space Center, Houston, TX, US), AC(Rensselaer Polytechnic Inst., Troy, NY, US)
Publication:
Icarus (ISSN 0019-1035), vol. 109, no. 2, p. 274-283 (Icarus Homepage)
Publication Date:
06/1994
Category:
Lunar and Planetary Exploration
Origin:
STI
NASA/STI Keywords:
ASTEROIDS, INFRARED ASTRONOMY, INFRARED SPECTRA, IRON, MINERALS, VISIBLE SPECTRUM, ABSORPTION SPECTRA, ALBEDO, INFRARED ABSORPTION
DOI:
10.1006/icar.1994.1093
Bibliographic Code:
1994Icar..109..274V

Abstract

Absorption features centered near 0.60-0.65 and 0.80-0.90 micrometers have been identified in the spectra of five low-albedo main-belt and outer-belt asteroids. These absorption features are attributed respectively to the (6)A1 goes to (4)T2(G) and (6)A1 goes to (4)T1(G) charge transfer transitions in minerals such as goethite, hematite, and jarosite that are products of the aqueous alteration of anhydrous silicates. A shoulder near 0.63 micrometers has also been identified in the absorption feature centered near 0.7 micrometers attributed to oxidized iron in phyllosilicates found predominantly in C- and G-class asteroids reflectance spectra. The coexistence of iron oxides with phyllosilicates in asteroids believed to have undergone aqueous alteration would be expected based upon analogy with terrestrial aqueous alteration and the observed mineralogy of carbonaceous chondrites. The number of low-albedo asteroids having only iron alteration absorption features compared to the number of low-albedo asteroids having spectral characteristics indicative of phyllosilicates is small. Either the conditions under which these asteroids formed are rare, or the iron alteration minerals could be formed in the interiors of objects where phyllosilicates dominate the surface mineralogy.
Bibtex entry for this abstract   Preferred format for this abstract (see Preferences)
  New!

Find Similar Abstracts:

Use: Authors
Title
Keywords (in text query field)
Abstract Text
Return: Query Results Return    items starting with number
Query Form
Database: Astronomy
Physics
arXiv e-prints