C. Drouet d’Aubigny
A5002788775- Astro and Planetary Science
- Planetary Science and Exploration
- Isotope Analysis in Ecology
- Superconducting and THz Device Technology
- Photonic and Optical Devices
- Gamma-ray bursts and supernovae
- Semiconductor Lasers and Optical Devices
- Terahertz technology and applications
- Adaptive optics and wavefront sensing
- Gyrotron and Vacuum Electronics Research
- Calibration and Measurement Techniques
- Astronomical Observations and Instrumentation
- Spectroscopy and Laser Applications
- Astronomy and Astrophysical Research
- Nuclear Physics and Applications
- Spacecraft and Cryogenic Technologies
- Microwave Engineering and Waveguides
- Acoustic Wave Resonator Technologies
- Photoreceptor and optogenetics research
- earthquake and tectonic studies
- Advanced MEMS and NEMS Technologies
- Stellar, planetary, and galactic studies
- Laser Design and Applications
- Astrophysical Phenomena and Observations
- Atmospheric Ozone and Climate
Planetary Science Institute
2014-2023
University of Arizona
2013-2023
Lunar and Planetary Institute
2022
RTX (United States)
2022
Smithsonian Institution
2020
National Museum of Natural History
2020
Optical Sciences (United States)
2001-2003
European Southern Observatory
1997
Abstract During its approach to asteroid (101955) Bennu, NASA’s Origins, Spectral Interpretation, Resource Identification, and Security-Regolith Explorer (OSIRIS-REx) spacecraft surveyed Bennu’s immediate environment, photometric properties, rotation state. Discovery of a dusty natural satellite, or unexpected characteristics would have had consequences for the mission’s safety observation strategy. Here we show that observations during this period were highly sensitive satellites (sub-meter...
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...
The OSIRIS-REx Camera Suite (OCAMS) will acquire images essential to collecting a sample from the surface of Bennu. During proximity operations, these document presence satellites and plumes, record spin state, enable an accurate model asteroid's shape, identify any hazards. They confirm sampleable regolith on surface, observe sampling event itself, image head in order verify its readiness be stowed. Bennu's history as example early solar system material, microgravity body with planetesimal...
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...
Abstract Rock breakdown due to diurnal thermal cycling has been hypothesized drive boulder degradation and regolith production on airless bodies. Numerous studies have invoked its importance in driving landscape evolution, yet morphological features produced by fracture processes never definitively observed an body, or any surface where other weathering mechanisms may be ruled out. The Origins, Spectral Interpretation, Resource Identification, Security–Regolith Explorer (OSIRIS-REx) mission...
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 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...
OSIRIS-REx (Origins, Spectral Interpretation, Resource Identification, and Security–Regolith Explorer) is a NASA mission to return sample of asteroid (101955) Bennu. Photometric modeling Bennu's surface key element both site characterization our broader scientific understanding the asteroid. heterogeneous presents substantial variation in reflectance produces scattered dataset that poses challenge photometric modeling. We show resolution shape model with which we calculate angles strongly...
Abstract Near‐Earth asteroid (101955) Bennu is an active experiencing mass loss in the form of ejection events emitting up to hundreds millimeter‐ centimeter‐scale particles. The close proximity Origins, Spectral Interpretations, Resource Identification, and Security–Regolith Explorer spacecraft enabled monitoring particles for a 10‐month period encompassing Bennu's perihelion aphelion. We found 18 multiparticle events, with masses ranging from near zero grams (or thousands uncertainties)...
Abstract The OSIRIS‐REx Asteroid Sample Return Mission is the third mission in National Aeronautics and Space Administration (NASA)'s New Frontiers Program first U.S. to return samples from an asteroid Earth. most important decision ahead of team selection a prime sample‐site on surface (101955) Bennu. success hinges identifying site that safe has regolith can readily be ingested by spacecraft's sampling mechanism. To inform this mission‐critical decision, Bennu mapped using Camera Suite...
We use observations of Bennu's impact craters, and measurements particle sizes seen in images from the OSIRIS-REx (the Origins, Spectral Interpretation, Resource Identification Regolith Explorer sample-return mission) sampling event, to conclude there is a ~ global sub-surface layer finer-grained material on Bennu. The evident areas inside around roughness assessments crater interiors vs. surrounding terrain, colors, depth-to-diameter (d/D) ratios, size-frequency distribution. All data sets...
We present a near-global normal albedo map of asteroid (101955) Bennu, created using images from the PolyCam imager onboard Origins, Spectral Interpretation, Resource Identification, and Security–Regolith Explorer (OSIRIS-REx) spacecraft. acquired high-resolution (nadir pixel scale ~6.25 cm/pixel) surface equator to mid-latitudes (~ ± 50°) at low phase angle (~8°). applied specialized charge smear radiometric correction data compensate for image artifacts stemming very short exposure times....
Supercam is a 345 GHz, 64-pixel heterodyne imaging array for the Heinrich Hertz Submillimeter Telescope (HHSMT). By integrating SIS mixer devices with Low Noise Ampliers (LNAs) in 8 - 1x8 pixel modules, size needed cryostat and complexity of internal wiring signicantly reduced. All subsystems including optics, cryostat, bias system, IF boxes, spectrometer have been integrated all 64 pixels. In spring 2012, SuperCam was installed on HHSMT an engineering run where it underwent system level...
We present first results of Hertz/VPM, the submillimeter polarimeter employing dual Variable-delay Polarization Modulator (dual-VPM). This device differs from previously used polarization modulators in that it operates translation, rather than mechanical rotation. discuss basic theory behind this and its potential advantages over commonly half-wave plate. The dual-VPM was tested both at Submillimeter Telescope Observatory laboratory. In each case we a detailed description setup. discovered...
Abstract The Origins, Spectral Interpretation, Resource Identification, and Security‐Regolith Explorer (OSIRIS‐REx) mission observed the Moon during spacecraft's Earth gravity assist in 2017. From spacecraft view, lunar phase was 42°, in‐view hemisphere dominated by anorthositic highlands terrain. Lunar spectra obtained OSIRIS‐REx Visible InfraRed Spectrometer show evidence of several candidate absorption features. We observe 2.8‐μm hydration band, confirming spectral results from other...