A5090602508- Astro and Planetary Science
- Planetary Science and Exploration
- Isotope Analysis in Ecology
- Space Satellite Systems and Control
- Spacecraft Dynamics and Control
- High-pressure geophysics and materials
- Spacecraft Design and Technology
- Gamma-ray bursts and supernovae
- Inertial Sensor and Navigation
- Earthquake Detection and Analysis
- Space Exploration and Technology
- Geology and Paleoclimatology Research
- Maritime Navigation and Safety
- Surface Roughness and Optical Measurements
- Nuclear Physics and Applications
- Astrophysics and Star Formation Studies
- Distributed systems and fault tolerance
- earthquake and tectonic studies
- Computational Physics and Python Applications
- Solar and Space Plasma Dynamics
University of Arizona
2021
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...
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 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...
The Origins, Spectral Interpretation, Resource Identification, and Security–Regolith Explorer (OSIRIS-REx) mission conducted nearly two years of proximity operations around asteroid (101955) Bennu. Optical navigation (OpNav)was critical to the success OSIRIS-REx's collect a sample from Landmark-based OpNav was particularly important for achieving highest precision requirements. This paper assesses performance landmark after transition centroid-based at end Orbital A phase. An overall...
View Video Presentation: https://doi.org/10.2514/6.2022-2470.vid The NASA Origins, Spectral Interpretation, Resource Identification, and Security–Regolith Explorer (OSIRIS-REx) spacecraft began close proximity operations at the small (500-m diameter) B-type asteroid (101955) Bennu in December 2018 concluded May 2021. Hundreds of grams pristine surface regolith were collected on October 20, 2020, when OSIRIS-REx successfully executed Touch Go (TAG) sample collection sequence. touched down...
Abstract The Origins, Spectral Interpretation, Resource Identification, and Security–Regolith Explorer (OSIRIS-REx) spacecraft spent more than 2 yr characterizing near-Earth asteroid (101955) Bennu. OSIRIS-REx Laser Altimeter (OLA) was responsible for producing the most accurate reconstruction of asteroid’s surface—down to a global resolution around 5 cm with data precision ±1.25 cm. However, best-quality OLA digital terrain model (DTM), version 21 (v21), not available navigation during...
Abstract We summarize a decade of effort by the Origins, Spectral Interpretation, Resource Identification, and Security–Regolith Explorer (OSIRIS-REx) mission team to build up unique capabilities, processes, procedures required accomplish unprecedented navigation performance during proximity operations at asteroid (101955) Bennu. Stereophotoclinometry was key technology used for digital terrain model (DTM) generation landmark navigation, enabling estimation spacecraft trajectories Bennu’s...
Navigation for spacecraft missions around small bodies requires Optical (OpNav) to achieve the Orbit Determination (OD) performance necessary maintain safety and mission science objectives. Precise accurate inertial pointing knowledge in space of OpNav imager is required meet this performance. This paper presents results OSIRIS-REx team’s routine trending NavCam1 with respect attitude, including analysis thermal deviations NavCam boresight correlated sun-on-deck geometry as well operation...
View Video Presentation: https://doi.org/10.2514/6.2022-1226.vid The Lucy Jupiter-Trojan asteroid mission launched on October 16th, 2021, setting out for the first-ever exploration of Trojan clusters at Jupiter-Sun L4 and L5 points. Between June 2027 November 2028, will conduct five consecutive close flybys in cluster. In 2033, it return to Jupiter Trojans one final flyby Patroclus/Meonetius binary system 2025, while enroute Trojans, perform a main belt (52246) Donaldjohanson. Robust optical...
On January 6, 2019, OSIRIS-REx first observed particles ejecting from the surface of near-Earth asteroid (101955) Bennu. This ejection event was unexpected and only captured by chance in a pair optical navigation images taken NavCam 1 imager. With this limited dataset two observations per ejected particle, traditional orbit determination to reconstruct particles’ trajectories not possible. Therefore, new technique developed for reconstruction based on some simplifying assumptions that all...
On October 20, 2020, NASA’s OSIRIS-REx spacecraft performed its Touch-and-Go (TAG) activity, in which it briefly contacted the surface of asteroid Bennu and successfully collected a sample regolith. Subsequent images sampling mechanism showed that thousands small regolith particles were escaping from it, apparently conjunction with movements mechanical arm wrist joint by is attached to spacecraft. The could be tracked one image another, across multiple images, allowed optical navigation team...
The Origins, Spectral Interpretation, Resource Identification, and Security-Regolith Explorer (OSIRIS-REx) spacecraft was launched in September 2016 arrived at its target, near-Earth asteroid (101955) Bennu late 2018. After executing nearly two years of multi-phase proximity operations navigation mapping campaigns, on October 20, 2020 OSIRIS-REx successfully performed the Touch-And-Go (TAG) maneuver to become first American mission collect a sample from an asteroid. As is one smallest...