Thermal metamorphism of the C, G, B, and F asteroids seen from the 0.7 μm, 3 μm, and UV absorption strengths in comparison with carbonaceous chondrites

Hiroi, T.; Zolensky, M. E.; Pieters, C. M.; Lipschutz, M. E.

doi:10.1111/j.1945-5100.1996.tb02068.x

Cited by 210 publications

(248 citation statements)

References 23 publications

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“…It is important to remember that CM chondrites have highly variable spectral properties and that comet surfaces undergo significant changes due to Solar heating. The 700 nm features is caused by hydrated minerals which disappear if the material is moderately heated (Hiroi et al 1996). It is therefore possible that the surface spectra of comets and primitive asteroids do not give a true representation of the interior composition, which is the volume sampled when looking at meteorite sample.…”

Section: Results: 2p/encke and CM Chondritesmentioning

confidence: 99%

2P/Encke, the Taurid complex NEOs and the Maribo and Sutter’s Mill meteorites

Tubiana

Snodgrass

Michelsen

et al. 2015

A&A

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Aims. 2P/Encke is a short period comet that was discovered in 1786 and has been extensively observed and studied for more than 200 years. The Taurid meteoroid stream has long been linked with 2P/Encke owing to a good match of their orbital elements, even though the comet's activity is not strong enough to explain the number of observed meteors. Various small near-Earth objects (NEOs) have been discovered with orbits that can be linked to 2P/Encke and the Taurid meteoroid stream. Maribo and Sutter's Mill are CM type carbonaceous chondrite that fell in Denmark on January 17, 2009 and April 22, 2012, respectively. Their pre-atmospheric orbits place them in the middle of the Taurid meteoroid stream, which raises the intriguing possibility that comet 2P/Encke could be the parent body of CM chondrites. Methods. To investigate whether a relationship between comet 2P/Encke, the Taurid complex associated NEOs, and CM chondrites exists, we performed photometric and spectroscopic studies of these objects in the visible wavelength range. We observed 2P/Encke and 10 NEOs on August 2, 2011 with the FORS instrument at the 8.2 m Very Large Telescope on Cerro Paranal (Chile). Results. Images in the R filter, used to investigate the possible presence of cometary activity around the nucleus of 2P/Encke and the NEOs, show that no resolved coma is present. None of the FORS spectra show the 700 nm absorption feature due to hydrated minerals that is seen in the CM chondrite meteorites. All objects show featureless spectra with moderate reddening slopes at λ < 800 nm. Apart for 2003 QC 10 and 1999 VT 25 , which show a flatter spectrum, the spectral slope of the observed NEOs is compatible with that of 2P/Encke. However, most of the NEOs show evidence of a silicate absorption in lower S/N data at λ > 800 nm, which is not seen in 2P/Encke, which suggests that they are not related. Conclusions. Despite similar orbits, we find no spectroscopic evidence for a link between 2P/Encke, the Taurid complex NEOs and the Maribo and Sutter's Mill meteorites. However, we cannot rule out a connection to the meteorites either, as the spectral differences may be caused by secondary alteration of the surfaces of the NEOs.

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Section: Results: 2p/encke and CM Chondritesmentioning

confidence: 99%

2P/Encke, the Taurid complex NEOs and the Maribo and Sutter’s Mill meteorites

Tubiana

Snodgrass

Michelsen

et al. 2015

A&A

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“…This absorption has been detected on most C-type asteroids that are commonly related to the carbonaceous chondrite meteorite family (Hiroi et al 1996). Although referred to systematically as the "3-µm band", both meteorites and asteroids display a diversity of 3-µm band shapes, which is not currently fully understood (Jones et al 1990;Milliken & Rivkin 2009;Hiroi et al 1996;Rivkin & Emery 2010;Beck et al 2010b).…”

Section: Introductionmentioning

confidence: 99%

“…Although referred to systematically as the "3-µm band", both meteorites and asteroids display a diversity of 3-µm band shapes, which is not currently fully understood (Jones et al 1990;Milliken & Rivkin 2009;Hiroi et al 1996;Rivkin & Emery 2010;Beck et al 2010b). Here, we show that, as for asteroids, a diversity exists within near-IR spectral signatures of -OH bearing minerals and that goethite-like minerals have a 3-µm band extremely similar to that of water-ice absorption (i.e.…”

Section: Introductionmentioning

confidence: 99%

Goethite as an alternative origin of the 3.1μm band on dark asteroids

Beck

Quirico

Sevestre

et al. 2010

A&A

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Context. The reflectance spectra of some main-belt asteroids contain a 3-µm band, which is explained by the presence of water or hydroxyl groups in minerals. Recent observations of 24-Themis have been found to display evidence of water ice. Aims. We synthesize iron oxy-hydroxide materials and in the laboratory measure their near-infrared spectra under dry conditions to compare with asteroid observations. Methods. The syntheses are performed using either the well-established titration method or a non-conventional hydrothermal method. Bi-directional near-infrared reflectance spectra are obtained using the spectrogonio radiometer available at LPG/IPAG. Spectra are measured in a vacuum to avoid contamination by adsorbed water. Results. The reflectance spectra that we measure for synthesized goethite are consistent with published transmission spectra. The 3-µm band in goethite has a minimum around 3.10 µm, similar to observations of 24-Themis. Its overall shape matches well Themis's 3-µm band; goethite-like oxy-hydroxydes are a viable alternative way of explaining 24-Themis near-IR spectra

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“…The fits were weighted using the IRAF generated sigma spectrum for each asteroid. Data shorter than 0.49 µm were not included in the fit due to potential contamination from the UV absorption below ∼0.5 µm created by an Fe 2+ intervalence charge transfer attributed to phyllosilicates (Vilas 1994;Hiroi et al 1996). Asteroid slopes and 1-sigma uncertainties are shown in Table 2.…”

Section: Data Reduction and Analysismentioning

confidence: 99%

Space weathering trends among carbonaceous asteroids

Kaluna

Masiero

Meech

2016

Icarus

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We present visible spectroscopic and albedo data of the 2.3 Gyr old Themis family and the <10 Myr old Beagle sub-family. The slope and albedo variations between these two families indicate C-complex asteroids become redder and darker in response to space weathering. Our observations of Themis family members confirm previously observed trends where phyllosilicate absorption features are less common among small diameter objects. Similar trends in the albedos of large (>15 km) and small (≤15 km) Themis members suggest these phyllosilicate feature and albedo trends result from regolith variations as a function of diameter. Observations of the Beagle asteroids show a small, but notable fraction of members with phyllosilicate features. The presence of phyllosilicates and the dynamical association of the main-belt comet 133P/Elst-Pizarro with the Beagle family imply the Beagle parent body was a heterogenous mixture of ice and aqueously altered minerals.Subject headings: main belt asteroids, carbonaceous asteroids, space weathering

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Thermal metamorphism of the C, G, B, and F asteroids seen from the 0.7 μm, 3 μm, and UV absorption strengths in comparison with carbonaceous chondrites

Cited by 210 publications

References 23 publications

2P/Encke, the Taurid complex NEOs and the Maribo and Sutter’s Mill meteorites

2P/Encke, the Taurid complex NEOs and the Maribo and Sutter’s Mill meteorites

Goethite as an alternative origin of the 3.1μm band on dark asteroids

Space weathering trends among carbonaceous asteroids

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