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dark asteroids

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Journal Article
Journal: Elements
Published: 01 February 2011
Elements (2011) 7 (1): 29-34.
... of the dust from comet Wild 2 are very similar to those of carbonaceous chondrites, a class of meteorites allegedly derived from primitive, dark asteroids. Comets no longer represent extremely primitive samples of the early Solar System that are radically different from dark asteroids. We enter a new era...
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Journal Article
Published: 01 August 2004
American Mineralogist (2004) 89 (8-9): 1280-1289.
... and environment (solar nebular or asteroidal) of this alteration are still matters of controversial scientific discussion. Here we present evidence for late-stage, high-temperature processes recorded in Ca,Fe-rich rims around Allende dark inclusions 3529 and IV-1 studied using scanning (SEM) and transmission...
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Series: GSA Field Guide
Published: 01 January 2011
DOI: 10.1130/2011.0024(19)
EISBN: 9780813756240
... and ledges of massive earthy goethite. Local dark brown lustrous goethite occurs as botryoidal masses in vugs. It forms massive to weakly stratified blankets lying unconformably on Ordovician Prairie du Chien Group dolostones. It rests underneath a pre-Wisconsin drift cap and a layer of clay of unknown age...
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Journal Article
Journal: Elements
Published: 01 February 2014
Elements (2014) 10 (1): 19-24.
..., such as the B, C, P, and D types, all of which correspond to dark, reddish asteroids. These asteroids are presumably made of the same materials as the most primitive meteorites, the carbonaceous chondrites, which include complex organic molecules, silicate minerals, and reduced iron and other metals. About 60...
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Journal Article
Published: 01 January 2008
Reviews in Mineralogy and Geochemistry (2008) 68 (1): 429-462.
... that alteration occurred in the presence of aqueous solutions under variable physico-chemical conditions (temperature, water:rock ratio, pH, f O 2 , and fluid compositions) in an asteroidal setting; it started within 1–2 m.y. after formation of the CV CAIs, was multistage, and lasted up to 15 m.y. ( Krot et al...
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Series: Geological Society, London, Special Publications
Published: 01 January 2015
DOI: 10.1144/SP401.18
EISBN: 9781862396777
... of the asteroid ( Veverka et al. 1997 a ). Mathilde was found to be irregularly shaped and heavily cratered, with a dark surface that shows no albedo or colour variations ( Veverka et al. 1997 a ). No strong evidence of a pervasive structural fabric was identified on Mathilde ( Veverka et al. 1999...
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Journal Article
Journal: Elements
Published: 01 February 2014
Elements (2014) 10 (1): 11-17.
... in Göttingen, Germany, discovered a second object, ~545 km in diameter, which he named Pallas. In 1807, he also discovered Vesta, a 525 km diameter differentiated body (see McSween et al. 2014 this issue). Pallas and Vesta are the only asteroids that are visible to the naked eye (Ceres is too dark...
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Series: European Mineralogical Union Notes in Mineralogy
Published: 01 January 2015
DOI: 10.1180/EMU-notes.15.3
EISBN: 9780903056564
... ) Composite RGB ion microprobe image of some rock-forming elements: red = Mg, green = Ca, and blue = Al. Abstract Asteroids and comets comprise a diverse range of undifferentiated bodies that are currently of much interest in terms of space exploration. The meteorites called chondrites provide us...
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Journal Article
Published: 01 January 2008
Reviews in Mineralogy and Geochemistry (2008) 68 (1): 273-343.
... be determined, but the diameter and visual albedo are much more difficult. At the same distance from the Sun, a large, dark body and a small, bright one could have the same magnitude. The magnitude independent of distance, or absolute magnitude ( H ), of an asteroid is defined as the visual magnitude...
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Journal Article
Published: 01 January 2016
Reviews in Mineralogy and Geochemistry (2016) 81 (1): 161-238.
... and some asteroids, and examines the conceptual framework for interpreting these data. The first section outlines the motivation for measuring the HSE in planetary materials. The second section briefly considers methods for measuring and interpreting HSE abundance and Os isotopic data. The third section...
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Series: AAPG Memoir
Published: 01 January 2013
DOI: 10.1306/13361574M1013543
EISBN: 9781629810027
... system), they may be mistaken for asteroids. Dust and carbonaceous material coating a comet’s exterior give them a dark appearance that is similar to asteroids and insulates the interior ices from volatilization. Weissman et al. (1989) examined the evolution of comets as their orbits subject them...
Journal Article
Published: 01 November 2016
American Mineralogist (2016) 101 (11): 2452-2467.
...Rhian H. Jones; Francis M. Mccubbin; Yunbin Guan Abstract Phosphate minerals in ordinary chondrites provide a record of fluids that were present during metamorphic heating of the chondrite parent asteroids. We have carried out a petrographic study of the phosphate minerals, merrillite and apatite...
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Series: AAPG Memoir
Published: 01 January 2013
DOI: 10.1306/13361569M1013548
EISBN: 9781629810027
... that will enable further exploration and will provide new sources for our dwindling resources and offset their increasing prices or scarcity on Earth. Mining is anticipated on the Moon for increasingly valuable commodities, such as thorium (Th) and samarium (Sm), and on selected asteroids or other moons...
Journal Article
Journal: Elements
Published: 01 February 2014
Elements (2014) 10 (1): 25-30.
..., the Tagish Lake meteorite, a rare carbonaceous chondrite, has been associated with D-class asteroids; both Tagish Lake and D-class asteroids have reflectance spectra that are very dark in the visible-light region, becoming brighter toward the near-infrared, and they exhibit no recognizable absorption bands...
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Journal Article
Journal: Elements
Published: 01 February 2014
Elements (2014) 10 (1): 39-44.
...Harry Y. McSween; Maria Cristina De Sanctis; Thomas H. Prettyman; Dawn Science Team Abstract Most asteroids are collisional rubble from eons past, and few of them have survived intact. Vesta, the second most massive asteroid, is the only differentiated, rocky body in this category. This asteroid...
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Image
Figure  5 —Idealized midarm cross-sections of  1,  an <b>asteroid</b> of conventio...
Published: 01 July 2008
Figure 5 —Idealized midarm cross-sections of 1, an asteroid of conventional arrangement, with the ambulacral overlying the adambulacral (light stipple); and 2, Embolaster graffhami n. gen. and sp., with the adambulacral homologue, the first virgal (light stipple) adradial to the adambulacral
Journal Article
Published: 01 January 2008
Reviews in Mineralogy and Geochemistry (2008) 68 (1): 345-397.
... of asteroidal material, as sampled by meteorites, in order to understand some of the processes involved in the formation of these primitive bodies and how such events have affected the oxygen isotopic ratios, ultimately offering a window back to the very origin of Solar System and its primordial oxygen isotopic...
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Series: Geological Society, London, Special Publications
Published: 01 January 2006
DOI: 10.1144/GSL.SP.2006.256.01.17
EISBN: 9781862395046
... ordinary chondrites are the commonest of meteorite classes falling to Earth, this may relate to the fact that we sample in this way only meteorites related to asteroids (Apollos, Amors) with near-Earth passing orbits, and carbonaceous chondrites may be the norm in the main asteroid zone between Mars...
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Journal Article
Published: 01 January 2008
Reviews in Mineralogy and Geochemistry (2008) 68 (1): 571-590.
... to define a group, common practice is that there should be five or more members in a group. A defined meteorite group is thought to be derived from a single asteroid. However, some groups are genetically related and are derived from a common parent asteroid. Chondrites are primitive stony meteorites; rocks...
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Journal Article
Published: 01 January 2014
Reviews in Mineralogy and Geochemistry (2014) 78 (1): 399-446.
... have recently visited Jupiter, comets, asteroids, and one spectrometer-carrying spacecraft is on its way to Pluto. Together these systems are providing a wealth of data that will enable a better understanding of the composition of condensed matter bodies in the solar system. Minerals, ices, liquids...
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