Showing papers by "Carly Howett published in 2017"
••
University of Maryland, College Park1, Lowell Observatory2, Goddard Space Flight Center3, Search for extraterrestrial intelligence4, Southwest Research Institute5, Ames Research Center6, Centre national de la recherche scientifique7, Massachusetts Institute of Technology8, University of Virginia9, Johns Hopkins University Applied Physics Laboratory10
TL;DR: In this paper, a pixel-by-pixel Hapke radiative transfer model was applied to the LEISA scans of Pluto to define the spatial distribution of the abundance and textural properties of the volatiles methane and nitrogen ices and non-volatiles water ice and tholin.
123 citations
••
University of Grenoble1, Lowell Observatory2, Goddard Space Flight Center3, University of Maryland, College Park4, Southwest Research Institute5, Massachusetts Institute of Technology6, Ames Research Center7, Stanford University8, Space Telescope Science Institute9, University of Virginia10, Johns Hopkins University Applied Physics Laboratory11
TL;DR: In this article, the authors report a study of the distribution and physical state of the ices and non-ice materials on Pluto's illuminated surface and their mode and degree of mixing.
103 citations
••
TL;DR: In this article, the authors report on the first and only opportunity that Cassini's RADAR instrument had to observe Enceladus's south polar terrain closely, targeting an area a few tens of kilometres north of the active sulci.
Abstract: Saturn’s moon Enceladus is an active world. In 2005, the Cassini spacecraft witnessed for the first time water-rich jets venting from four anomalously warm fractures (called sulci) near its south pole (1,2). Since then, several observations have provided evidence that the source of the material ejected from Enceladus is a large underground ocean, the depth of which is still debated (3,4,5,6). Here, we report on the first and only opportunity that Cassini’s RADAR instrument (7,8) had to observe Enceladus’s south polar terrain closely, targeting an area a few tens of kilometres north of the active sulci. Detailed analysis of the microwave radiometry observations highlights the ongoing activity of the moon. The instrument recorded the microwave thermal emission, revealing a warm subsurface region with prominent thermal anomalies that had not been identified before. These anomalies coincide with large fractures, similar or structurally related to the sulci. The observations imply the presence of a broadly distributed heat production and transport system below the south polar terrain with ‘plate-like’ features and suggest that a liquid reservoir could exist at a depth of only a few kilometres under the ice shell at the south pole. The detection of a possible dormant sulcus further suggests episodic geological activity.
50 citations
••
Southwest Research Institute1, Lowell Observatory2, Search for extraterrestrial intelligence3, Ames Research Center4, Lunar and Planetary Institute5, Goddard Space Flight Center6, Johns Hopkins University Applied Physics Laboratory7, Massachusetts Institute of Technology8, Stanford University9, University of Maryland, College Park10, University of Grenoble11
27 citations
••
TL;DR: In this paper, the effect of energetic electron bombardment on the surface of the moon Mimas was modeled using a combination of a guiding center, bounce-averaged charged particle tracing approach and a particle physics code.
21 citations
••
Southwest Research Institute1, Goddard Space Flight Center2, Ames Research Center3, Lowell Observatory4, University of Latvia5, Planetary Science Institute6, Breakthrough Institute7, Johns Hopkins University Applied Physics Laboratory8, Massachusetts Institute of Technology9, Jet Propulsion Laboratory10, Stanford University11, University of Grenoble12, University of Maryland, College Park13, Lunar and Planetary Institute14, Space Telescope Science Institute15, University of Virginia16
TL;DR: In this paper, two semi-independent calibration techniques used to determine the inflight radiometric calibration for the New Horizons’ Multi-spectral Visible Imaging Camera (MVIC) are discussed.
19 citations
••
TL;DR: In this article, the authors analyzed light curves produced from color observations taken during New Horizons' approach to the Pluto-system by its Multi-spectral Visible Imaging Camera (MVIC, part of the Ralph instrument) are analyzed.
4 citations
01 Mar 2017
2 citations