B. R. Hawke
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Characterization of space weathering from Lunar Reconnaissance Orbiter Camera ultraviolet observations of the Moon Open
We investigate the effects of space weathering at ultraviolet wavelengths using a near-global seven-band (321–689 nm) mosaic from the Lunar Reconnaissance Orbiter Camera (LROC) Wide Angle Camera (WAC). We confirm that for moderate- to high…
LRO observations of morphology and surface roughness of volcanic cones and lobate lava flows in the Marius Hills Open
The volcanic domes, cones, sinuous rilles, and pyroclastic deposits of the Marius Hills region of the Moon (~13.4°N, 304.6°E) represent a significant episode of magmatic activity at or near the lunar surface that is still poorly understood…
The origin of Ina: Evidence for inflated lava flows on the Moon Open
Ina is an enigmatic volcanic feature on the Moon known for its irregularly shaped mounds, the origin of which has been debated since the Apollo Missions. Three main units are observed on the floor of the depression (2.9 km across, ≤64 m de…
Geology of the King crater region: New insights into impact melt dynamics on the Moon Open
New geologic sketch maps and digital elevation models for King crater and the surrounding lunar farside highlands were created from Lunar Reconnaissance Orbiter Camera (LROC) Wide‐angle Camera (WAC) and Narrow Angle Camera (NAC) images. NA…
Characterization of previously unidentified lunar pyroclastic deposits using Lunar Reconnaissance Orbiter Camera data Open
We used a Lunar Reconnaissance Orbiter Camera (LROC) global monochrome Wide‐angle Camera (WAC) mosaic to conduct a survey of the Moon to search for previously unidentified pyroclastic deposits. Promising locations were examined in detail u…
The Mairan domes: Silicic volcanic constructs on the Moon Open
[1] The Mairan domes are four features located in northern Oceanus Procellarum at ∼312.3E, 41.4N on the Moon. High resolution visible imagery, visible-to-mid-IR spectra, and Lunar Prospector Th abundance data all indicate that these four d…
Compton-Belkovich: Nonmare, Silicic Volcanism on the Moon’s Far Side Open
LRO NAC and WAC images reveal nonmare volcanic features on a 26 x 32 km, high-reflectance terrain feature at the center of the Compton-Belkovich Th Anomaly. Dome shapes, high reflectance, and Diviner Christiansen Feature data indicate sili…
Lunar swirls: Examining crustal magnetic anomalies and space weathering trends Open
[1] We have used multispectral images from Clementine and data from Lunar Prospector's magnetometer to conduct a survey of lunar crustal magnetic anomalies, prominent lunar swirls, and lesser known swirl markings to provide new information…
Radiative transfer modeling of near‐infrared reflectance of lunar highland and mare soils Open
With near‐infrared hyperspectral data sets returned from KAGUYA/SELENE and Chandrayaan‐1's Moon Mineralogic Mapper (M 3 ), accurate evaluation and interpretation of lunar data sets with higher spectral resolution has never been more critic…
New insight into lunar impact melt mobility from the LRO camera Open
The Lunar Reconnaissance Orbiter Camera (LROC) is systematically imaging impact melt deposits in and around lunar craters at meter and sub‐meter scales. These images reveal that lunar impact melts, although morphologically similar to terre…
Surface morphology of domes in the Marius Hills and Mons Rümker regions of the Moon from Earth‐based radar data Open
Clusters and coalesced complexes of domes represent a relatively rare landform within the extensive, low‐relief, lunar maria. While they are typically spectroscopically similar to mare basalts emplaced by high‐volume, low‐viscosity eruptio…
Antarctic Lunar Meteorites from Cryptomaria of the Moon Open
Mineralogical, geochemical, isotopic compositions and cosmic-ray exposure history, combined with the orbital data revealed that Antarctic lunar meteorites, Yamato-793169, Asuka-881757, Meteorites Hills 01210, and Miller Range 05035 represe…
Composition and origin of the Dewar geochemical anomaly Open
Dewar crater is a 50‐km diameter impact structure located in the highlands northwest of the South Pole–Aitken basin on the lunar farside. A low‐albedo area with enhanced Th and Sm values is centered east‐northeast of Dewar crater. This are…
A Mariner 10 color study of Mercurian craters Open
We have used recalibrated Mariner 10 color image data (UV and orange) to examine spectral trends associated with crater features on the “incoming” hemisphere of Mercury. Spacecraft images of the Moon (Galileo and Clementine) and lunar samp…
Radiative transfer modeling of compositions of lunar pyroclastic deposits Open
While over 100 lunar pyroclastic deposits have been identified remotely, their compositions remain poorly constrained. In this work, we determine the compositions of three lunar regional pyroclastic deposits which are likely to contain lar…
Refined thorium abundances for lunar red spots: Implications for evolved, nonmare volcanism on the Moon Open
We have used improved knowledge of the spatial distribution of thorium (Th) on the lunar surface, in conjunction with a forward modeling analysis of Lunar Prospector gamma ray data, to estimate the thorium abundances of lunar red spots. Th…
Remote sensing studies of the Dionysius region of the Moon Open
The Dionysius region is located near the western edge of Mare Tranquillitatis and is centered on Dionysius crater, which exhibits a well‐developed dark ray system. Proposed origins for these dark rays included impact melt deposits and dark…
Radar mapping of lunar cryptomaria east of Orientale basin Open
Lunar cryptomare deposits represent early basaltic volcanic material that has been mantled by or incorporated into highland‐rich ejecta from basin‐ or crater‐forming impacts. Mapping these buried basalts is important for understanding regi…
Constraints on the depth and variability of the lunar regolith Open
Knowledge of regolith depth structure is important for a variety of studies of the Moon and other bodies such as Mercury and asteroids. Lunar regolith depths have been estimated using morphological techniques (i.e., Quaide and Oberbeck 196…
Evidence for a high‐Th, evolved lithology on the Moon at Hansteen Alpha Open
We have revisited a previous interpretation of lunar Th abundances at Hansteen Alpha, which is thought to be a nonmare volcanic construct. Previous studies concluded that while Th abundances were higher than the surrounding mare basalts, T…
Remote sensing studies of the Lomonosov‐Fleming region of the Moon Open
Lomonosov‐Fleming is a 620 km, pre‐Nectarian impact basin centered at 19°N, 105°E. Clementine multispectral images and a variety of spacecraft photographs were used to investigate the composition and origin of geologic units in the region.…
Hansteen Alpha: A volcanic construct in the lunar highlands Open
We have used data from the Clementine and Lunar Prospector spacecraft in conjunction with near‐IR reflectance spectra collected with Earth‐based telescopes to study the composition and origin of Hansteen Alpha, an arrowhead‐shaped highland…
Distribution and modes of occurrence of lunar anorthosite Open
We have utilized telescopic near‐infrared spectra and multispectral images of the Moon provided by the Galileo and Clementine missions to determine the distribution and modes of occurrence of pure anorthosite. Anorthosites have now been id…
Igneous activity in the southern highlands of the Moon Open
Detailed investigations of both endogenic and exogenic dark‐haloed craters can provide critical information concerning the geology, composition, and evolution of portions of the lunar surface. Several dark‐haloed and dark‐rayed craters hav…
Calculating iron contents of lunar highland materials surrounding Tycho crater from integrated Clementine UV‐visible and near‐infrared data Open
Optical properties of lunar surface materials are modified by exposure to the space environment, including bombardment by solar wind particles and micrometeorites. One of the main problems in the interpretation of lunar spectral observatio…
Lunar pure anorthosite as a spectral analog for Mercury Open
— Plans are underway for spacecraft missions to the planet Mercury beginning in the latter part of this decade (NASA's MESSENGER (MErcury, Surface, Space ENvironment, GEochemistry, Ranging) and ESA's BepiColombo). Mercury is an airless bod…
Remote sensing and geological studies of the Hadley‐Apennine region of the Moon Open
— We have used data from the Clementine and Lunar Prospector spacecraft in conjunction with reflectance spectra collected with Earth‐based telescopes to study the geology of the Hadley‐Apennine portion of the lunar Imbrium basin. The Apenn…
Imaging of lunar surface maturity Open
The physical evolution of the lunar surface with exposure to the space environment is termed maturation, and maturity is the degree to which a particular lunar soil possesses quantitative characteristics consistent with that exposure. Seve…