C. W. V. Wolner
A5046481001- Astro and Planetary Science
- Planetary Science and Exploration
- Isotope Analysis in Ecology
- Gamma-ray bursts and supernovae
- Geology and Paleoclimatology Research
- High-pressure geophysics and materials
- Genital Health and Disease
- Radioactivity and Radon Measurements
- Geological and Geochemical Analysis
- Oral Health Pathology and Treatment
- Marine and environmental studies
- Environmental and Sediment Control
- Astrophysics and Star Formation Studies
- Nuclear Physics and Applications
- earthquake and tectonic studies
- Fluid Dynamics Simulations and Interactions
- Radioactive contamination and transfer
- Scientific Computing and Data Management
- Earthquake Detection and Analysis
- Congenital limb and hand anomalies
University of Arizona
2019-2025
Planetary Science Institute
2019-2023
Active asteroids are those that show evidence of ongoing mass loss. We report repeated instances particle ejection from the surface (101955) Bennu, demonstrating it is an active asteroid. The events were imaged by OSIRIS-REx (Origins, Spectral Interpretation, Resource Identification, and Security-Regolith Explorer) spacecraft. For three largest observed events, we estimated ejected velocities sizes, event times, source regions, energies. also determined trajectories photometric properties...
Abstract On September 24, 2023, NASA's OSIRIS‐REx mission dropped a capsule to Earth containing ~120 g of pristine carbonaceous regolith from Bennu. We describe the delivery and initial allocation this asteroid sample introduce its bulk physical, chemical, mineralogical properties early analyses. The is very dark overall, with higher‐reflectance inclusions particles interspersed. Particle sizes range submicron dust stone ~3.5 cm long. Millimeter‐scale larger stones typically have hummocky or...
Visible-wavelength color and reflectance provide information about the geologic history of planetary surfaces. Here we present multispectral images (0.44 to 0.89 micrometers) near-Earth asteroid (101955) Bennu. The surface has variable colors overlain on a moderately blue global terrain. Two primary boulder types are distinguishable by their texture. Space weathering Bennu materials does not simply progress from red (or vice versa). Instead, freshly exposed, redder surfaces initially...
Carbonaceous asteroids, such as (101955) Bennu, preserve material from the early Solar System, including volatile compounds and organic molecules. We report spacecraft imaging spectral data collected during after retrieval of a sample Bennu’s surface. The sampling event mobilized rocks dust into debris plume, excavating 9-meter-long elliptical crater. This exposed is darker, spectrally redder, more abundant in fine particulates than original bulk density displaced subsurface was 500 to 700...
Abstract The OSIRIS‐REx mission returned a sample of regolith from the carbonaceous asteroid Bennu in September 2023. We present preliminary situ investigations petrology and petrography selected particles ranging size 0.5 to 3 mm. Using combination optical electron beam techniques, we investigate whole specimens polished sections belonging morphologically visually distinct categories particles. find that morphological differences are reflective petrographic petrologic differences, leading...
Abstract We analyze the trajectories of 313 particles seen in near‐Bennu environment between December 2018 and September 2019. Of these, 65% follow suborbital trajectories, 20% undergo more than one orbital revolution around asteroid, 15% directly escape on hyperbolic trajectories. The median lifetime these is ∼6 hr. are sensitive to Bennu's gravitational field, which allows us reliably estimate spherical harmonic coefficients through degree 8 resolve nonuniform mass distribution 3....
Abstract The surface of the rubble‐pile asteroid (101955) Bennu has been characterized in detail by OSIRIS‐REx (Origins, Spectral Interpretation, Resource Identification, and Security–Regolith Explorer) mission. By examining global local digital terrain models, we observed that possesses terraces, is, a series roughly latitude‐parallel, step‐like slope breaks. These partially circumscribe poles extend east‐west over several longitudinal quadrants at mid‐ to high (≥30°) latitudes. terraces...
On 24 September 2023, the NASA OSIRIS-REx mission dropped a capsule to Earth containing approximately 120 g of pristine carbonaceous regolith from Bennu. We describe delivery and initial allocation this asteroid sample introduce its bulk physical, chemical, mineralogical properties early analyses. The is very dark overall, with higher-reflectance inclusions particles interspersed. Particle sizes range sub-micron dust stone about 3.5 cm long. Millimeter-scale larger stones typically have...
Abstract The Origins, Spectral Interpretation, Resource Identification, and Security–Regolith Explorer (OSIRIS-REx) spacecraft mission characterized collected a sample from asteroid (101955) Bennu. After the OSIRIS-REx Sample Return Capsule released to Earth’s surface in 2023 September, diverted into new orbit that encounters (99942) Apophis 2029, enabling second with same unique capabilities: OSIRIS–Apophis (APEX). On 2029 April 13, 340 m diameter will draw within ∼32,000 km of surface,...
Abstract The OSIRIS-REx spacecraft collected a surface sample from Hokioi crater (55.8° N, 42.3° E; diameter ∼20 m) on the asteroid Bennu in 2020 October. We explore geology of collection site, known as Nightingale, by using digital terrain models, relative albedo maps, and images spacecraft. sits at northwest edge an older, larger (120 m diameter) between two north–south ridges respectively located roughly 0° 90° longitude, which unconsolidated material generally migrates geopotential high...
Large-scale collaborative scientific endeavors, such as space missions and Earth observatories, typically have a press office that strategizes coordinates communication with the public. The same kind of internal coordination is not necessarily applied to community—that is, via scholarly publications—although peer review journal production provide external quality control. Issues sometimes plague publications from large, complex team efforts—such error propagation, duplication, unaddressed...