@article{kinczyk_prockter_byrne_susorney_chapman_2020, title={A morphological evaluation of crater degradation on Mercury: Revisiting crater classification with MESSENGER data}, volume={341}, ISSN={["1090-2643"]}, DOI={10.1016/j.icarus.2020.113637}, abstractNote={Observations of impact crater morphology can be used to gain insight into the geological history and evolution of a planet's surface. Image data from the Mariner 10 mission revealed the diversity of impact crater morphologies and degradational states on Mercury, leading to early studies that sought to establish a stratigraphic column for the planet, despite only acquiring image data for ~45% of the surface. In 2011, the MErcury Surface, Space ENvironment, GEochemistry, and Ranging (MESSENGER) spacecraft entered orbit around Mercury, returning a high-resolution global image dataset that enables a robust analysis of crater morphology and degradation to be completed for the entirety of Mercury's surface. In this study, we conducted a visual classification of crater degradation according to initial crater morphology, and assigned a degradation state to all craters on Mercury ≥40 km in diameter. In our scheme, Class 1 craters are those that are heavily degraded, and Class 5 craters are very fresh with bright ray systems. We discuss the processes involved in crater degradation and erasure, and the challenges associated with applying crater degradation to derive the timing of geological events. We found that, based on the global spatial density of craters in each class, there appears to be a dearth of Class 1 craters within the intercrater plains, likely due to several ancient basin-sized impacts effectively obliterating a considerable portion of craters ≥40 km in diameter in this region. The crater degradation database we present here will serve as a useful tool for future analyses of Mercury's geological evolution.}, journal={ICARUS}, author={Kinczyk, Mallory J. and Prockter, Louise M. and Byrne, Paul K. and Susorney, Hannah C. M. and Chapman, Clark R.}, year={2020}, month={May} }
 @article{spencer_stern_moore_weaver_singer_olkin_verbiscer_mckinnon_parker_beyer_et al._2020, title={The geology and geophysics of Kuiper Belt object (486958) Arrokoth}, volume={367}, ISSN={["1095-9203"]}, DOI={10.1126/science.aay3999}, abstractNote={Examining Arrokoth}, number={6481}, journal={SCIENCE}, author={Spencer, J. R. and Stern, S. A. and Moore, J. M. and Weaver, H. A. and Singer, K. N. and Olkin, C. B. and Verbiscer, A. J. and McKinnon, W. B. and Parker, J. Wm. and Beyer, R. A. and et al.}, year={2020}, month={Feb}, pages={998-+} }
 @article{stern_weaver_spencer_olkin_gladstone_grundy_moore_cruikshank_elliott_mckinnon_et al._2019, title={Initial results from the New Horizons exploration of 2014 MU69, a small Kuiper Belt object}, volume={364}, ISSN={["1095-9203"]}, DOI={10.1126/science.aaw9771}, abstractNote={
            New Horizons flies past MU
            69
          }, number={6441}, journal={SCIENCE}, author={Stern, S. A. and Weaver, H. A. and Spencer, J. R. and Olkin, C. B. and Gladstone, G. R. and Grundy, W. M. and Moore, J. M. and Cruikshank, D. P. and Elliott, H. A. and McKinnon, W. B. and et al.}, year={2019}, month={May}, pages={649-+} }
 @article{susorney_james_johnson_chabot_ernst_mazarico_neumann_kinczyk_2019, title={The thickness of radar-bright deposits in Mercury's northern hemisphere from individual Mercury Laser Altimeter tracks}, volume={323}, ISSN={["1090-2643"]}, DOI={10.1016/j.icarus.2019.01.016}, abstractNote={The discovery of Mercury's radar-bright deposits has expanded our understanding of volatiles in the solar system. Key to deciphering the history and origin of the radar-bright deposits is an estimate of the volume of radar-bright material that in turn requires a measure of the average thickness of the deposits. In this study we investigate changes in topography across radar-bright deposits hosted in flat-floored, complex craters using individual edited Mercury Laser Altimeter (MLA) tracks. We compare the difference in heights of radar-bright regions and non-radar-bright regions of the crater floor and the difference of similarly sized and located regions in non-radar-bright craters and show that the two populations cannot be distinguished. The similarity of topography in these two sets of craters allows an upper limit of 15 m to be placed on the thickness of the radar-bright deposits.}, journal={ICARUS}, author={Susorney, Hannah C. M. and James, Peter B. and Johnson, Catherine L. and Chabot, Nancy L. and Ernst, Carolyn M. and Mazarico, Erwan M. and Neumann, Gregory A. and Kinczyk, Mallory J.}, year={2019}, month={May}, pages={40–45} }