A5016931971- Planetary Science and Exploration
- Astro and Planetary Science
- Space Exploration and Technology
- Geology and Paleoclimatology Research
- Space Science and Extraterrestrial Life
- Isotope Analysis in Ecology
- Space exploration and regulation
- Geological and Geochemical Analysis
- Laser-induced spectroscopy and plasma
- Geomagnetism and Paleomagnetism Studies
- Geochemistry and Geologic Mapping
- Marine and environmental studies
- Historical Astronomy and Related Studies
- Spaceflight effects on biology
- Solar and Space Plasma Dynamics
- Stellar, planetary, and galactic studies
- Spacecraft and Cryogenic Technologies
- Archaeology and ancient environmental studies
- Scientific Research and Discoveries
- Calibration and Measurement Techniques
- Geological Studies and Exploration
- Mercury impact and mitigation studies
- Nuclear Physics and Applications
- Space Satellite Systems and Control
- Hydrocarbon exploration and reservoir analysis
Johns Hopkins University Applied Physics Laboratory
2016-2025
Institut de physique du globe de Paris
2025
Kyoto University
2023
University of Iowa
2023
Nagoya University
2023
Los Alamos National Laboratory
2023
Memorial University of Newfoundland
2023
Planetary Science Institute
1991-2023
Marshall Space Flight Center
2023
Goddard Space Flight Center
2023
The Clementine mission to the Moon returned global imaging data collected by ultraviolet visible (UVVIS) camera. This set is now in a final state of calibration, and five‐band multispectral digital image model (DIM) lunar surface will soon be available science community. We have used observations sample‐return sites stations extracted from DIM conjunction with compositional information for soils revise our previously published algorithms spectral determination FeO TiO 2 content surface....
A New Dawn Since 17 July 2011, NASA's spacecraft has been orbiting the asteroid Vesta—the second most massive and third largest in solar system (see cover). Russell et al. (p. 684 ) use Dawn's observations to confirm that Vesta is a small differentiated planetary body with an inner core, represents surviving proto-planet from earliest epoch of formation; also confirmed as source howardite-eucrite-diogenite (HED) meteorites. Jaumann 687 report on asteroid's overall geometry topography, based...
MESSENGER observations of Mercury’s high northern latitudes reveal a contiguous area volcanic smooth plains covering more than ~6% the surface that were emplaced in flood lava mode, consistent with average crustal compositions broadly similar to terrestrial komatiites.
Abstract Hollows are geologically young depressions on Mercury, most likely associated with the loss of volatile species. The distribution and morphometric properties hollows provide information about overall budget Mercury's (shallow) subsurface, significant implications for our understanding evolution Mercury airless planetary bodies in general. Here, we use a convolutional neural network to map global geographic MESSENGER orbital images assess their geostatistical relationships...
The derivation of quantitative elemental concentrations from multispectral imaging the Moon has long been a goal lunar remote sensing. Concentration maps at spatial resolutions available recent Clementine mission would provide revolutionary new tool for understanding origin and evolution crust. Lucey et al. [1995] presented method extracting concentration Fe Moon. This paper examines quantifies important aspects ofthat technique left unexamined by which had potential to severely limit its...
The physical evolution of the lunar surface with exposure to space environment is termed maturation, and maturity degree which a particular soil possesses quantitative characteristics consistent that exposure. Several measures or indices have been proposed employed, including abundance solar wind gas, various types agglutinates, grain size, I s /FeO. Among changes attendant are striking in optical soils. Mature soils dark red exhibit reduced spectral contrast relative immature This paper...
MESSENGER from Mercury The spacecraft passed by in October 2008, what was the second of three fly-bys before it settles into planet's orbit 2011. Another visited mid-1970s, which mapped 45% surface. Now, after MESSENGER, only 10% Mercury's surface remains to be imaged up close. Denevi et al. (p. 613 ) use this near-global data look at mechanisms that shaped crust, likely formed eruption magmas different compositions over a long period time. Like Moon, is dotted with impact craters. Watters...
Clementine UVVIS images of the lunar sample‐return sites have been processed and used to produce refined calibrations for iron titanium determination algorithms Lucey et al. [1995, 1996]. The high spatial resolution data permits individual sampling stations be resolved at Apollo 15, 16, 17 landing sites. We find an excellent, linear correlation between spectral Fe Ti parameters average FeO TiO 2 contents soils sampled each site or station. This demonstrates that these techniques can...
The origin of plains on Mercury, whether by volcanic flooding or impact ejecta ponding, has been controversial since the Mariner 10 flybys (1974–75). High-resolution images (down to 150 meters per pixel) obtained during first MESSENGER flyby show evidence for vents around Caloris basin inner margin and demonstrate that were emplaced sequentially inside adjacent numerous large craters, thicknesses in excess several kilometers. Radial graben a floor-fractured crater may indicate intrusive...
A New Dawn Since 17 July 2011, NASA's spacecraft has been orbiting the asteroid Vesta—the second most massive and third largest in solar system (see cover). Russell et al. (p. 684 ) use Dawn's observations to confirm that Vesta is a small differentiated planetary body with an inner core, represents surviving proto-planet from earliest epoch of formation; also confirmed as source howardite-eucrite-diogenite (HED) meteorites. Jaumann 687 report on asteroid's overall geometry topography, based...
Multispectral images of Mercury obtained by the MESSENGER spacecraft reveal that its surface has an overall relatively low reflectance with three large-scale units identified on basis and slope (0.4 to 1.0 micrometer). A higher-reflectance, red material occurs as a distinct class smooth plains were likely emplaced volcanically; lower-reflectance lesser spectral may represent crustal component enriched in opaque minerals, possibly more common at depth. spectrally intermediate terrain probably...
High-resolution images of Mercury's surface from orbit reveal that many bright deposits within impact craters exhibit fresh-appearing, irregular, shallow, rimless depressions. The depressions, or hollows, range tens meters to a few kilometers across, and have high-reflectance interiors halos. host rocks, which are associated with crater central peaks, peak rings, floors, walls, interpreted been excavated depth by the crater-forming process. most likely formation mechanisms for hollows...
The Caloris basin, the youngest known large impact basin on Mercury, is revealed in MESSENGER images to be modified by volcanism and deformation a manner distinct from that of lunar basins. morphology spatial distribution materials themselves closely match counterparts. Evidence for volcanic origin basin's interior plains includes embayed craters floor diffuse deposits surrounding rimless depressions interpreted pyroclastic origin. Unlike maria, are higher albedo than lack spectral evidence...
Mercury's regolith, derived from the crustal bedrock, has been altered by a set of space weathering processes. Before we can interpret composition, it is necessary to understand nature these surface alterations. The processes that weather are same as those form exosphere (micrometeoroid flux and solar wind interactions) moderated local environment presence global magnetic field. To comprehend how acts on an understanding needed contributing act interactive system. As no direct information...
Abstract Landforms unique to Mercury, hollows are shallow, flat‐floored irregular depressions notable for their relatively high reflectance and characteristic color. Here we document the range of geological settings in which occur. Most associated with impact structures (simple bowl‐shaped craters multiring basins, ranging from Kuiperian Calorian age). Hollows found low‐reflectance material global color unit blue plains, but they appear be absent high‐reflectance red plains. may occur...
Abstract Hollows are small, shallow, irregularly shaped landforms, widespread across Mercury, interpreted to have formed via loss of volatiles. Here, we present the first global analysis hollow degradation states using a new machine learning‐derived catalog. We define three classes, grading from younger/potentially active “Stage 1” (sharp morphology, high visible reflectance) older/potentially expired 3” (softened reflectance similar that surroundings). Most analyzed hollows Stage 1 ( N =...
[1] We have used multispectral images from Clementine and data Lunar Prospector's magnetometer to conduct a survey of lunar crustal magnetic anomalies, prominent swirls, lesser known swirl markings provide new information on the nature swirls their association with anomalies. find that all swirl-like albedo patterns are associated areas magnetized crust, but not crust colocated All observed exhibit spectral characteristics similar immature material generally slightly lower FeO values...