R. W. Gaskell

The morphometry of impact craters on Bennu

E. B. Bierhaus, O. Barnouin, Michael G. Daly, J. A. Seabrook et autres

Bennu is a ~500-m-diameter rubble-pile asteroid that is the target of detailed study by the Origins, Spectral Interpretation, Resource Identification, and Security–Regolith Explorer (OSIRIS-REx) mission. Here we use data from the OSIRIS-REx Laser Altimeter to assess depth-to-diameter ratios (d/D) of 108 impact …

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New gravity field of comet 67P/C-G based on Rosetta’s Doppler and optical data

Julien Laurent-Varin, Théo James, Jean‐Charles Marty, L. Jordá et autres

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Photometric Properties within the Reiner Gamma Swirl: Constraining Formation Mechanisms

D. L. Domingue, J. R. Weirich, F. C. Chuang, Samuel W. Courville et autres

Abstract The area in the Reiner Gamma swirl studied by Weirich et al. for topographic correlations also displays correlations with the Hapke-model-derived single-scattering albedo, surface roughness, and particle scattering properties with swirl unit. The correlations with single-scattering albedo associate compositional variations in …

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History of Ceres’s Cold Traps Based on Refined Shape Models

Norbert Schörghofer, R. W. Gaskell, E. Mazarico, J. R. Weirich

Abstract Permanently shadowed regions (PSRs) in the north polar region of Ceres have been previously mapped by the Dawn spacecraft. Putative ice deposits are found in some of these PSRs, whereas most PSRs host no bright deposits, which is thought to be …

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Sensitivity Testing of Stereophotoclinometry for the OSIRIS-REx Mission. II. Effective Observation Geometry for Digital Terrain Modeling

E. E. Palmer, J. R. Weirich, R. W. Gaskell, Diane Lambert et autres

Abstract The OSIRIS-REx mission used stereophotoclinometry (SPC) to generate digital terrain models (DTMs) of its target asteroid, Bennu. Here we present a suite of preflight tests conducted to identify the observing geometry and number of images needed to create DTMs that would …

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Sensitivity Testing of Stereophotoclinometry for the OSIRIS-REx Mission. I. The Accuracy and Errors of Digital Terrain Modeling

E. E. Palmer, J. R. Weirich, R. W. Gaskell, Diane Lambert et autres

Abstract Stereophotoclinometry (SPC) was the prime method of shape modeling for NASA’s OSIRIS-REx mission to asteroid Bennu. Here we describe the extensive testing conducted before launch to certify SPC as NASA Class B flight software, which not only validated SPC for operational …

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An Updated Shape Model of Dimorphos from DART Data

R. T. Daly, C. M. Ernst, O. S. Barnouin, R. W. Gaskell et autres

Abstract Dimorphos was the target of the Double Asteroid Redirection Test (DART) mission. This paper summarizes the properties of an updated shape model of Dimorphos, describes the differences between the updated shape model and an earlier version published by Daly, Ernst, Barnouin …

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Spectrophotometric and Topographic Correlations within the Mare Ingenii Swirl Region: Evidence for a Highly Mobile Lunar Regolith

D. L. Domingue, J. R. Weirich, F. C. Chuang, Amanda A. Sickafoose et autres

Abstract The spectrophotometric properties of two study areas in the Ingenii swirl region show that the combined effects of multiple processes are required to explain the regolith’s mineralogical and physical properties. Production of the swirl regions requires mobilization of the regolith in …

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The Search for Topographic Correlations within the Reiner Gamma Swirl

J. R. Weirich, D. L. Domingue, F. C. Chuang, Amanda A. Sickafoose et autres

Abstract Lunar swirls have been traditionally considered to be unaffected by topographic changes. Yet, correlations between areas of high albedo and lower elevations are observed in regions of the Mare Ingenii swirl. Here, we apply similar techniques used at Mare Ingenii to …

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Replication Data for: History of Ceres's Cold Traps Based on Refined Shape Models

Norbert Schörghofer, R. W. Gaskell, E. Mazarico, J. R. Weirich

Model results for nine perennially shadowed craters on asteroid (1) Ceres. Files contain topography, modeled direct solar irradiance, and modeled equilibrium surface temperatures for the study sites.

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Stereophotoclinometry for OSIRIS-REx Spacecraft Navigation

Coralie D. Adam, Leilah K. McCarthy, Jason M. Leonard, R. W. Gaskell et autres

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 the unique capabilities, processes, and procedures required to accomplish the unprecedented navigation performance required during proximity operations at asteroid …

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High-resolution shape models of Phobos and Deimos from stereophotoclinometry

C. M. Ernst, R. T. Daly, R. W. Gaskell, O. S. Barnouin et autres

We created high-resolution shape models of Phobos and Deimos using stereophotoclinometry and united images from Viking Orbiter, Phobos 2, Mars Global Surveyor, Mars Express, and Mars Reconnaissance Orbiter into a single coregistered collection. The best-fit ellipsoid to the Phobos model has radii …

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