Matthew D. Richardson

Evolution of Mercury’s Volatile-bearing Crust within Raditladi Basin

Deborah L. Domingue, J. R. Weirich, J. A. P. Rodriguez, Samuel Weston Courville et autres

Abstract Mercury’s surface presents significant challenges for understanding planetary volatile distribution. Previous studies have identified features including hollows, flows, and chaotic terrains as associated with the presence of volatiles. Their formation and connection to Mercury’s volatile inventory remain incompletely characterized. Using Hapke’s …

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Application of Machine Learning Techniques to Distinguish between Mare, Cryptomare, and Light Plains in Central Lunar South Pole−Aitken Basin

F. C. Chuang, Matthew D. Richardson, J. L. Whitten, D. P. Moriarty et autres

Abstract We apply machine learning techniques to identify and map resurfacing units in the central South Pole−Aitken (SPA) basin using three Lunar Reconnaissance Orbiter (LRO) mission data sets: 321/415 nm and 566/689 nm band reflectance ratios from Hapke photometrically standardized albedo maps …

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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Mapping Lunar Swirls with Machine Learning: The Application of Unsupervised and Supervised Image Classification Algorithms in Reiner Gamma and Mare Ingenii

F. C. Chuang, Matthew D. Richardson, J. R. Weirich, Amanda A. Sickafoose et autres

Abstract Lunar swirls are recognized as broad, bright albedo features in various regions of the Moon. These features are often separated by dark off-swirl lanes or terminate against the dark background, such as lunar maria. Prior mapping of swirls has been done …

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The Nature of Low-albedo Small Bodies from 3 μm Spectroscopy: One Group that Formed within the Ammonia Snow Line and One that Formed beyond It

Andrew S. Rivkin, Joshua P. Emery, E. S. Howell, Theodore Kareta et autres

Abstract We present evidence, via a large survey of 191 new spectra along with previously published spectra, of a divide in the 3 μm spectral properties of the low-albedo asteroid population. One group (“sharp types,” or STs, with band centers <3 μm) …

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Intra-articular Osteoid Osteoma in the Femoral Neck of an 18-year-old Man: A Case Report

Matthew D. Richardson, John A.M. Taylor

OBJECTIVE: This case study presents the delayed diagnosis, surgical management, and postsurgical follow-up of an intra-articular osteoid osteoma of the left femoral neck in an 18-year-old male patient with special emphasis on discussing the confusing clinical and imaging characteristics of the lesion …

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