Photometric, spectral phase and temperature effects on 4 Vesta and HED meteorites: Implications for the Dawn mission

Reddy, V.; Sanchez, Juan A.; Nathues, A.; Moskovitz, Nicholas; Li, Jian‐Yang; Cloutis, E. A.; Archer, K.; Tucker, R. A.; Gaffey, M. J.; Mann, J. P.; Sierks, H.; Schade, U.

doi:10.1016/j.icarus.2011.10.010

Cited by 81 publications

(118 citation statements)

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“…Reddy et al (2012b) used a Python code to measure the HED band center data that is very similar to the MATLAB code used by this work, but is more automated than the MATLAB code.…”

Section: Discussionmentioning

confidence: 99%

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Basalt or Not? Near-infrared Spectra, Surface Mineralogical Estimates, and Meteorite Analogs for 33 V_p-type Asteroids

Hardersen

Reddy

Cloutis

et al. 2018

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Investigations of the main asteroid belt and efforts to constrain that population's physical characteristics involve the daunting task of studying hundreds of thousands of small bodies. Taxonomic systems are routinely employed to study the large-scale nature of the asteroid belt because they utilize common observational parameters, but asteroid taxonomies only define broadly observable properties and are not compositionally diagnostic. This work builds upon the results of work by Hardersen et al., which has the goal of constraining the abundance and distribution of basaltic asteroids throughout the main asteroid belt. We report on the near-infrared (NIR: 0.7 to 2.5 μm) reflectance spectra, surface mineralogical characterizations, analysis of spectral band parameters, and meteorite analogs for 33 V p asteroids. NIR reflectance spectroscopy is an effective remote sensing technique to detect most pyroxene group minerals, which are spectrally distinct with two very broad spectral absorptions at ∼0.9 and ∼1.9 μm. Combined with the results from Hardersen et al., we identify basaltic asteroids for ∼95% (39/41) of our inner-belt V p sample, but only ∼25% (2/8) of the outer-belt V p sample. Inner-belt basaltic asteroids are most likely associated with (4) Vesta and represent impact fragments ejected from previous collisions. Outerbelt V p asteroids exhibit disparate spectral, mineralogical, and meteorite analog characteristics and likely originate from diverse parent bodies. The discovery of two additional likely basaltic asteroids provides additional evidence for an outer-belt basaltic asteroid population.

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“…Reddy et al (2012b) used a Python code to measure the HED band center data that is very similar to the MATLAB code used by this work, but is more automated than the MATLAB code.…”

Section: Discussionmentioning

confidence: 99%

“…Temperature corrections from Reddy et al (2012b) are applied to both the Band I and Band II centers, with the largest corrections applied to the latter. MATLAB band centers are averages of ∼40 measurements and SARA results are averages of three runs to ensure repeatability and consistency of the results.…”

Section: Discussionmentioning

confidence: 99%

Basalt or Not? Near-infrared Spectra, Surface Mineralogical Estimates, and Meteorite Analogs for 33 V_p-type Asteroids

Hardersen

Reddy

Cloutis

et al. 2018

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“…As stated earlier, the VIS-NIR spectra of 4055 Magellan and 5407 (1992 AX), and the NIR spectrum of 164121 (2003 YT1) show spectral characteristics of basaltic asteroids. Therefore, to the band parameters, we applied the temperature corrections derived by Reddy et al (2012c). In addition, the pyroxene compositions of these objects were determined using the equations derived by Burbine et al (2007).…”

Section: Mineralogical Analysismentioning

confidence: 99%

“…8, filled circle), we found that this object has a surface assemblage dominated by orthopyroxene. For comparison we also plotted the band centers of asteroid (4) Vesta (star symbol) measured by Reddy et al (2012c). The spectrum of this asteroid shows an inflection at ∼ 1.3 µm, which is visible in Type A clinopyroxene, olivineorthopyroxene mixtures and plagioclase (Burns, 1993 (Mittlefehldt et al, 1998).…”

Section: Mineralogical Analysismentioning

confidence: 99%

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Surface composition and taxonomic classification of a group of near-Earth and Mars-crossing asteroids

Sanchez

Michelsen

Reddy

et al. 2013

Icarus

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In the past, constraining the surface composition of near-Earth asteroids (NEAs) has been difficult due to the lack of high quality near-IR spectral data (0.7-2.5 µm) that contain mineralogically diagnostic absorption bands. Here we present visible (∼ 0.43-0.95 µm) and nearinfrared (∼ 0.7-2.5 µm) spectra of nine NEAs and five Mars-crossing asteroids (MCs). The YT1) as a V-type was made on the basis of its near-infrared spectrum since no visible spectrum is available for this asteroid. A mineralogical analysis was performed on six of the asteroids (those for which near-IR spectra were obtained or previously available). We found that three asteroids (241662 (2000 KO44), 19764 (2000 NF5), 138404 (2000) have mafic silicate compositions consistent with ordinary chondrites, while three others (4055 Magellan, 164121 (2003 YT1), 5407 (1992 AX)) are pyroxene-dominated basaltic achondrite assemblages. In the case of 5407 (1992 AX) we found that its basaltic surface composition contrasts its taxonomic classification as a S-type.

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Small fresh impact craters on asteroid 4 Vesta: A compositional and geological fingerprint

et al. 2014

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Small morphologically fresh impact craters (<10 km in diameter) on Vesta's surface with a photometrically distinct ejecta blanket are expected to represent fresh surface material and thus provide the opportunity to study the composition of the unweathered surface. Dawn-Framing Camera and Visual and Infrared Spectrometer (VIR) data reveal impact craters with bright, dark, and mixed, i.e., partly bright and dark, ejecta existing on Vesta's surface, which not only differ in the visible albedo from their surroundings but also in their composition. Differences in the composition are related to the visible albedo and/or the geographic location of the impact craters. Bright ejecta, only seen in the southern Vestan hemisphere, are dominated by howardite/eucrite-like material as expected for Vesta's upper crust. Dark ejecta associated with dark impact craters are dominated by a strongly absorbing, spectrally neutral compound, supporting an origin from carbon-rich impactors. Few impact craters of intermediate albedo in Vesta's southern hemisphere contain material resembling diogenites, which are expected to exist in the deeper parts of Vesta's interior. The geological settings suggest that the diogenite-like material represents a part of a layer of diogenitic material surrounding the Rheasilvia basin or local concentrations of diogenitic material as part of the ejecta excavated during the latter stage of the Rheasilvia impact event. The spectral differences between eucrite-and diogenite-dominated materials also could be verified due to spin-forbidden absorptions in the visible spectral range, which are known from laboratory spectra of pyroxenes, but, which have been identified in the VIR spectra of Vesta for the first time.

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Photometric, spectral phase and temperature effects on 4 Vesta and HED meteorites: Implications for the Dawn mission

Cited by 81 publications

References 50 publications

Basalt or Not? Near-infrared Spectra, Surface Mineralogical Estimates, and Meteorite Analogs for 33 V_p-type Asteroids

Basalt or Not? Near-infrared Spectra, Surface Mineralogical Estimates, and Meteorite Analogs for 33 V_p-type Asteroids

Surface composition and taxonomic classification of a group of near-Earth and Mars-crossing asteroids

Small fresh impact craters on asteroid 4 Vesta: A compositional and geological fingerprint

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Photometric, spectral phase and temperature effects on 4 Vesta and HED meteorites: Implications for the Dawn mission

Cited by 81 publications

References 50 publications

Basalt or Not? Near-infrared Spectra, Surface Mineralogical Estimates, and Meteorite Analogs for 33 Vp-type Asteroids

Basalt or Not? Near-infrared Spectra, Surface Mineralogical Estimates, and Meteorite Analogs for 33 Vp-type Asteroids

Surface composition and taxonomic classification of a group of near-Earth and Mars-crossing asteroids

Small fresh impact craters on asteroid 4 Vesta: A compositional and geological fingerprint

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Product

Resources

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Basalt or Not? Near-infrared Spectra, Surface Mineralogical Estimates, and Meteorite Analogs for 33 V_p-type Asteroids

Basalt or Not? Near-infrared Spectra, Surface Mineralogical Estimates, and Meteorite Analogs for 33 V_p-type Asteroids