Brent J. Bos
A5066334089- Planetary Science and Exploration
- Astro and Planetary Science
- Adaptive optics and wavefront sensing
- Astronomy and Astrophysical Research
- Isotope Analysis in Ecology
- Spacecraft and Cryogenic Technologies
- Atmospheric aerosols and clouds
- Space Satellite Systems and Control
- Advanced optical system design
- Spacecraft Design and Technology
- Calibration and Measurement Techniques
- Space Exploration and Technology
- Aeolian processes and effects
- Space exploration and regulation
- Solar and Space Plasma Dynamics
- Stellar, planetary, and galactic studies
- Infrared Target Detection Methodologies
- Gamma-ray bursts and supernovae
- Space Science and Extraterrestrial Life
- Satellite Image Processing and Photogrammetry
- Optical measurement and interference techniques
- Optical Systems and Laser Technology
- Nuclear Physics and Applications
- Experimental and Theoretical Physics Studies
- High-pressure geophysics and materials
Goddard Space Flight Center
2013-2024
University of Arizona
1999-2001
University of Michigan
1993
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 Deep Atmosphere Venus Investigation of Noble gases, Chemistry, and Imaging (DAVINCI) mission described herein has been selected for flight to as part the NASA Discovery Program. DAVINCI will be first incorporate science-driven flybys an instrumented descent sphere into a unified architecture. anticipated scientific outcome new understanding atmosphere, surface, evolutionary path possibly once-habitable planet analog hot terrestrial exoplanets. primary design features preferred launch in...
The objective of the Phoenix mission is to determine if Mars' polar region can support life. Since liquid water a basic ingredient for life, as we know it, an important goal exists at landing site. It believed that layer Martian soil preserves ice by forming barrier against high temperatures and sublimation, but exposed sublimates without formation phase. Here show possible independent physical thermodynamical evidence besides ice, saline in areas disturbed Lander. Moreover, thermodynamics...
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...
When the OSIRIS-REx spacecraft pressed its sample collection mechanism into surface of Bennu, it provided a direct test poorly understood near-subsurface physical properties rubble-pile asteroids, which consist rock fragments at rest in microgravity. Here, we find that forces measured by are best modeled as granular bed with near-zero cohesion is half dense bulk asteroid. The low gravity small asteroid such Bennu effectively weakens near subsurface not compressing upper layers, thereby...
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....
The OSIRIS-REx Visible and Infrared Spectrometer (OVIRS) is a point spectrometer covering the spectral range of 0.4 to 4.3 microns (25,000–2300 cm−1). Its primary purpose map surface composition asteroid Bennu, target sample return mission. information it returns will help guide selection site. It also provide global context for high spatial resolution spectra that can be related spatially unresolved terrestrial observations asteroids. compact, low-mass (17.8 kg), power efficient (8.8 W...
The optical microscope onboard the Phoenix spacecraft has returned color images (4 μ m pixel −1 ) of soils that were delivered to and held on various substrates. A preliminary taxonomy soil particles, based color, size, shape, identifies following particle types [generic names in brackets]: (1) reddish fines, mostly unresolved, are spectrally similar (though slightly darker than) global airborne dust [ red fines ], (2) silt‐ sand‐sized brownish grains brown sand (3) black (4) small amounts...
We propose the construction of LEGEND-1000, ton-scale Large Enriched Germanium Experiment for Neutrinoless $\beta \beta$ Decay. This international experiment is designed to answer one highest priority questions in fundamental physics. It consists 1000 kg Ge detectors enriched more than 90% $^{76}$Ge isotope operated a liquid argon active shield at deep underground laboratory. By combining lowest background levels with best energy resolution field, LEGEND-1000 will perform...
Abstract When the Origins, Spectral Interpretation, Resource Identification, and Security–Regolith Explorer (OSIRIS-REx) spacecraft collected a sample of surface material from asteroid Bennu in 2020 October, it was first time that an autonomous optical navigation system relying on natural terrain features had been used to guide planetary surface. This system, called Natural Feature Tracking (NFT), works by rendering digital models then correlating them with real-time images estimate...
The Imager for Mars Pathfinder returned over 16,000 high‐quality images from the surface of Mars. camera was well‐calibrated in laboratory, with <5% radiometric uncertainty. photometric properties two targets were also measured 3% Several data sets acquired during cruise and on confirm that system operated nominally throughout course mission. Image calibration algorithms developed landed operations to correct instrumental sources noise calibrate relative observations targets....
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 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 Origins, Spectral Interpretation, Resource Identification, and Security–Regolith Explorer (OSIRIS-REx) mission rendezvoused with asteroid (101955) Bennu in 2018 the primary objective of collecting a sample regolith from surface. As first NASA return mission, OSIRIS-REx deployed several new technologies to achieve program objectives. Here we present an overview Natural Feature Tracking (NFT), system developed autonomously guide spacecraft desired sampling site using optical...
Abstract The Terminal Tracking Camera system (TTCam) on the NASA Lucy Trojan asteroid Discovery mission consists of a pair block redundant cameras and their associated electronics that are mounted spacecraft’s Instrument Pointing Platform co-boresighted with rest mission’s science payload instruments. primary function TTCams is as navigation designed to provide an autonomous onboard late pre-encounter update location each flyby target relative spacecraft. However, once terminal tracking...
The Phoenix Robotic Arm Camera (RAC) is a variable‐focus color camera mounted to the (RA) of Mars Lander. It designed acquire both close‐up images Martian surface and microscopic (down scale 23 μ m/pixel) material collected in RA scoop. mounting position at end allows RAC be actively positioned for imaging targets not easily seen by Stereo Surface Imager (SSI), such as excavated trench walls under Lander structure. Color information acquired illuminating target with red, green, blue...
Abstract OSIRIS‐REx began observing particle ejection events shortly after entering orbit around near‐Earth asteroid (101955) Bennu in January 2019. For some of these events, the only observations ejected particles come from first two images taken immediately event by OSIRIS‐REx's NavCam 1 imager. Without three or more each particle, traditional determination is not possible. However, assuming that all at same time and location for a given event, approximating their velocities remained...
view Abstract Citations (32) References (41) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS The OH Distribution in Cometary Atmospheres: A Collisional Monte Carlo Model for Heavy Species Combi, M. R. ; Bos, B. J. Smyth, W. H. study presents an extension of the cometary atmosphere particle trajectory model formalism which makes it both physically correct heavy species and yet computationally reasonable. derivation accounts collision path scattering...
[1] In the paper “Microscopy analysis of soils at Phoenix landing site, Mars: Classification soil particles and description their optical magnetic properties” by Goetz et al. (Journal Geophysical Research, 115, E00E22, doi:10.1029/2009JE003437, 2010) an error appears in first sentence paragraph 55. The value 330°E should be 30°E.