Calibration, Projection, and Final Image Products of MESSENGER’s Mercury Dual Imaging System

Denevi, B. W.; Chabot, N. L.; Murchie, S. L.; Becker, K. J.; Blewett, D. T.; Domingue, D. L.; Ernst, C. M.; Hash, C.; Hawkins, S. E.; Keller, M. R.; Laslo, N. R.; Nair, Hari; Robinson, M. S.; Seelos, Frank P.; Stephens, G. K.; Turner, F. S.; Solomon, Sean C.

doi:10.1007/s11214-017-0440-y

Cited by 58 publications

(70 citation statements)

References 30 publications

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“…By comparing our spectra with the end members reported in Figure 8, we suggest that the composition of hollows is due to the presence of a mixture of different minerals (sulfides and silicates with different relative abundances) that may contribute to the absorption found in our spectra. These findings must consider the limitation of the MDIS WAC calibration reported in Denevi et al (2018), suggesting caution in interpreting features in MDIS spectra found in individual WAC data sets. Indeed, temporal variations observed in MDIS responsivity result in the presence of spurious spectral features in WAC color sets.…”

Section: Spectral Matching and Mineralogical Implicationsmentioning

confidence: 94%

“…All such evidences suggest that the spectral artifacts are constant within a given multispectral image set. Hence, as reported by Denevi et al (2018), future refinement and improvements to the calibration of the WAC data set must be performed for spectral studies that make use of the individual WAC color sets.…”

Section: Spectral Matching and Mineralogical Implicationsmentioning

confidence: 99%

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Mercury Hollows as Remnants of Original Bedrock Materials and Devolatilization Processes: A Spectral Clustering and Geomorphological Analysis

et al. 2018

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We perform a detailed geomorphological and compositional analysis on three craters hosting hollows located in the Victoria and Kuiper Quadrangles of Mercury. Based on Mercury Dual Imaging System data, high‐resolution detailed geomorphological mapping is provided in order to fully characterize the geological framework where hollows formed. In addition, we apply an unsupervised spectral clustering, based on a K‐mean algorithm, to separate in clusters our data sets. The comparison between the spectral and the well‐defined geomorphological units reveals a spatially coherent distribution. In particular, all hollows are uniquely identified by a well‐defined spectrum showing a wide absorption band between 0.558 and 0.828, with a possible hint of absorption toward 1 μm. Our analysis suggests that the composition of hollows may be characterized by a mixture of different minerals contributing to the absorptions found in our spectra. Indeed, sulfides alone (CaS, MnS, and MgS) cannot explain the spectrum behavior of hollows, even if the mechanism forming hollows likely involves the loss of volatiles from the surface. Hence, we have to consider bedrock‐forming material as partial responsible of the absorptions. For the studied hollows we suggest that the bedrock‐forming minerals are pyroxenes presenting transitional elements, like Cr, Ti, and Ni in substitution of Mg and/or Fe. Therefore, we suggest that the spectral characteristics of hollows are related to both remnant material produced by devolatilization process and to bedrock in which the hollows formed.

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Section: Spectral Matching and Mineralogical Implicationsmentioning

confidence: 94%

Section: Spectral Matching and Mineralogical Implicationsmentioning

confidence: 99%

Mercury Hollows as Remnants of Original Bedrock Materials and Devolatilization Processes: A Spectral Clustering and Geomorphological Analysis

et al. 2018

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“…In this work, we use the final calibration of the Mercury Dual Imaging System 665 m/pixel, eight-color, global image mosaic, described by Denevi et al (2018) and available in the Planetary Data System (PDS) and at http://messenger.jhuapl.edu/Explore/Images.html#global-mosaics. Responsivity of the Mercury Dual Imaging System filters was found to vary in an unpredictable manner over time, possibly due to radiation or outgassing events, resulting in artifacts in previous global mosaic products that led to some regions being omitted from analyses of relative spectral reflectance properties (Murchie et al, 2015) and hampered quantitative comparisons of albedo and reflectance trends on a global scale.…”

Section: Approachmentioning

confidence: 99%

Global Distribution and Spectral Properties of Low‐Reflectance Material on Mercury

Klima

Denevi

Ernst

et al. 2018

Geophysical Research Letters

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We examine the global distribution and spectral properties of low‐reflectance material (LRM) across Mercury to estimate the relative carbon abundance of prominent exposures and to test hypotheses for the origin of carbon in LRM. Our mapping demonstrates that LRM is consistently excavated from depth and that the spectral curvature attributed to carbon becomes more subdued as these surface deposits age. We find that the 600‐nm band depth in LRM deposits is related to carbon content and can be used to estimate carbon enrichment. LRM deposits excavated by basins and large craters may be enriched with as much as 4 wt% carbon over the local mean. Regional deposits, associated with the most heavily cratered terrains, are enriched by an average of ~2.5 wt% carbon. The association of LRM with excavation from depth shows that the carbon in LRM is native to the planet, rather than deposited over time by impacts.

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“…The final image mosaic product has been obtained in June 2018 with the version 3.5.2.0 (6 April 2018) of the Integrated Software for Imagers and Spectrometers developed and provided by the U.S. Geological Survey (Anderson et al, ; Gaddis et al, ; Torson & Becker, ). Our method is mainly based on the method described in Denevi et al (, section 8) to obtain the final products of the MESSENGER team. Below are reminded the main steps of the two methods, and their differences are addressed.…”

Section: Data Set and Data Processingmentioning

confidence: 99%

Global Spectral Properties and Lithology of Mercury: The Example of the Shakespeare (H‐03) Quadrangle

et al. 2019

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The MErcury Surface, Space ENvironment, GEochemistry and Ranging mission showed the surface of Mercury with an accuracy never reached before. The morphological and spectral analyses performed thanks to the data collected between 2008 and 2015 revealed that the Mercurian surface differs from the surface of the Moon, although they look visually very similar. The surface of Mercury is characterized by a high morphological and spectral variability, suggesting that its stratigraphy is also heterogeneous. Here, we focused on the Shakespeare (H‐03) quadrangle, which is located in the northern hemisphere of Mercury. We produced an 8‐color cube of this quadrangle at 450‐m per pixel spatial resolution and with a complete coverage. Various selected color maps based on this eight‐color cube were used to analyze the spectral properties of this region to define its compositional variability and identify some clear units constrained by relevant spectral parameters: for example, we identified a higher concentration of low reflectance material around three main craters of Shakespeare (Degas, Akutagawa, and Sholem Aleichem) and in the area to the south of Sobkou Planitia delimited by 24.4°N to 28.4°N and −140°W to −125°W. Moreover, we selected some regions of interest, which can be proposed as particularly interesting targets for the Visual and Infrared Hyper‐spectral Imager and Mercury Radiometer and Thermal Imaging Spectrometer instruments onboard the BepiColombo spacecraft. This work can help for the geological analysis of this quadrangle, by integrating information that are usually not derived with a single morphostratigraphic analysis.

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Calibration, Projection, and Final Image Products of MESSENGER’s Mercury Dual Imaging System

Cited by 58 publications

References 30 publications

Mercury Hollows as Remnants of Original Bedrock Materials and Devolatilization Processes: A Spectral Clustering and Geomorphological Analysis

Mercury Hollows as Remnants of Original Bedrock Materials and Devolatilization Processes: A Spectral Clustering and Geomorphological Analysis

Global Distribution and Spectral Properties of Low‐Reflectance Material on Mercury

Global Spectral Properties and Lithology of Mercury: The Example of the Shakespeare (H‐03) Quadrangle

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