Modeling asteroid surfaces from observations and irradiation experiments: The case of 832 Karin

Brunetto, R.; Vernazza, Pierre; Marchi, S.; Birlan, Mirel; Fulchignoni, M.; Orofino, V.; Strazzulla, G.

doi:10.1016/j.icarus.2006.05.019

Cited by 96 publications

(125 citation statements)

References 33 publications

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“…This link had been suggested for years based on the presence of two deep absorption bands in their spectra, around 1 and 2 microns, similar to that of OCs and characteristic of a mixture of olivines and pyroxenes (see for instance Chapman 1996;Brunetto et al 2006, among many others). The analysis of the sample from the S-type asteroid Itokawa returned by the Hayabusa spacecraft confirmed this link (Yurimoto et al 2011).…”

Section: Linking Small Bodies With Meteoritesmentioning

confidence: 97%

“…Efforts to determine the surface properties must be continued. Irradiation experiments in the laboratory have allowed to understand the space weathering processes on the surfaces of olivines and pyroxenes-rich S-complex asteroids (see Chapman 1996;Strazzulla et al 2005;Vernazza et al 2006Vernazza et al , 2009a, among many others), including the related end-members A and V types (Brunetto et al 2007;Fulvio et al 2012). The influence of the space weathering on the reflectance spectra of most meteorite types is however still unknown, apart from some experiments on enstatite chondrites and mesosiderites (Vernazza et al 2009b).…”

Section: Asteroid-meteorite Linkmentioning

confidence: 99%

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Density of asteroids

Carry

2012

Planetary and Space Science

519

444

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The small bodies of our solar system are the remnants of the early stages of planetary formation. A considerable amount of information regarding the processes that occurred during the accretion of the early planetesimals is still present among this population. A review of our current knowledge of the density of small bodies is presented here. Density is indeed a fundamental property for the understanding of their composition and internal structure. Intrinsic physical properties of small bodies are sought by searching for relationships between the dynamical and taxonomic classes, size, and density. Mass and volume estimates for 287 small bodies (asteroids, comets, and transneptunian objects) are collected from the literature. The accuracy and biases affecting the methods used to estimate these quantities are discussed and best-estimates are strictly selected. Bulk densities are subsequently computed and compared with meteorite density, allowing to estimate the macroporosity (i.e., amount of voids) within these bodies. Dwarf-planets apparently have no macroporosity, while smaller bodies (<400 km) can have large voids. This trend is apparently correlated with size: C and S-complex asteroids tends to have larger density with increasing diameter. The average density of each Bus-DeMeo taxonomic classes is computed (DeMeo et al., 2009, Icarus 202). S-complex asteroids are more dense on average than those in the C-complex that in turn have a larger macroporosity, although both complexes partly overlap. Within the C-complex asteroids, B-types stand out in albedo, reflectance spectra, and density, indicating a unique composition and structure. Asteroids in the Xcomplex span a wide range of densities, suggesting that many compositions are included in the complex. Comets and TNOs have high macroporosity and low density, supporting the current models of internal structures made of icy aggregates. Although the number of density estimates sky-rocketed during last decade from a handful to 287, only a third of the estimates are more precise than 20%. Several lines of investigation to refine this statistic are contemplated, including observations of multiple systems, 3-D shape modeling, and orbital analysis from Gaia astrometry.Keywords: Minor planets, Mass, Volume, Density, Porosity Small bodies as remnants of planetesimalsThe small bodies of our solar System are the left-overs of the building blocks that accreted to form the planets, some 4.6 Gyr ago. They represent the most direct witnesses of the conditions that reigned in the proto-planetary nebula (Bottke et al. 2002a). Indeed, terrestrial planets have thermally evolved and in some cases suffered erosion (e.g., plate tectonic, volcanism) erasing evidence of their primitive composition. For most small bodies, however, their small diameter limited the amount of radiogenic nuclides in their interior, and thus the amount of energy for internal heating. The evolution of small bodies is therefore mainly exogenous, through eons of collisions, external heating, and bombardm...

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Section: Linking Small Bodies With Meteoritesmentioning

confidence: 97%

Section: Asteroid-meteorite Linkmentioning

confidence: 99%

Density of asteroids

Carry

2012

Planetary and Space Science

519

444

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“…Our approach involved applying the model proposed by Brunetto et al (2006) and calculating the C s parameter for each of these objects using the formula:…”

Section: Methods Used To Analyze Datamentioning

confidence: 99%

“…Vernazza et al (2009) demonstrate the necessity to take the composition into account when evaluating weathering effectiveness. The laboratory experiments show that solarwind ion implantation is the most rapid of several competing processes (Brunetto et al 2006;Vernazza et al 2009;Loeffler et al 2009). …”

Section: Introductionmentioning

confidence: 99%

“…On the basis of laboratory experiments, Brunetto et al (2006) describe the spectral effects of solar wind irradiation by an exponential continuum in terms of the ratio of weathered spectra to unweathered spectra. Since ion-induced spectral reddening is related to the formation of displacements, they correlated the model with a damage parameter of the surface given as the number of displacements per cm 2 .…”

Section: Introductionmentioning

confidence: 99%

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Spectral properties of eight near-Earth asteroids

Popescu

Birlan

Binzel

et al. 2011

A&A

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Context. Near-Earth objects are among the most accessible bodies in the solar system in terms of the spacecraft propulsion requirements to reach them. The choice of targets and the planning of space missions are based on high quality ground-based science. Aims. The knowledge of the ensemble of physical parameters for these objects, including their composition, is a critical point in defining any mission scientific objectives. Determining the physical properties of near-Earth asteroids (NEAs) is also possible from the ground by analyzing spectroscopy at both visible and infrared wavelengths. Methods. We present spectra of eight NEAs (1917, 8567, 16960, 164400, 188452, 2001 SG286, and 2010 obtained using the NASA telescope IRTF equipped with the spectro-imager SpeX. The observations were performed in the 0.8-2.5 μm spectral region using the low resolution mode of the spectrograph. We completed the taxonomic classification using the Bus-DeMeo taxonomy. We analyzed the spectra by comparing them to meteorite spectra from the Relab database using a χ 2 approach. For the S-type asteroids of our sample, the band centers and BAR were calculated. We also attempted to interpret our data using a space-weathering model. Results. The taxonomic classification of five objects was reviewed and we assigned a corresponding type to the other three asteroids that were not classified before. We found that (1917) Cuyo, (8567) 1996 HW1, (16960) 1998 QS52, (188452) 2004 HE62, and 2010 are in the S-complex. We achieved a good matching of our S-type asteroids with the spectra of ordinary chondrites meteorites. The asteroid (5620) Jasonwheeler was found to have a NIR spectrum similar to carbonaceous chondrite meteorites. Thus, our results confirm its primitive properties obtained in several other spectral intervals.

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The Physics of Asteroids and Their Junction with Dynamics

Birlan

Nedelcu

2009

Dynamics of Small Solar System Bodies and Exoplanets

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Modeling asteroid surfaces from observations and irradiation experiments: The case of 832 Karin

Cited by 96 publications

References 33 publications

Density of asteroids

Density of asteroids

Spectral properties of eight near-Earth asteroids

The Physics of Asteroids and Their Junction with Dynamics

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