Eris, the second largest trans-Neptunian object (136199), melted early and maintains a warm ice conductive ice shell unlike Pluto.
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| http://dx.doi.org/10.1126/sciadv.adl2949 | DOI Listing |
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Pluto's surface is dominated by the huge, pear-shaped basin Sputnik Planitia. It appears to be of impact origin, but modelling has not yet explained its peculiar geometry. We propose an impact mechanism that reproduces its topographic shape while also explaining its alignment near the Pluto-Charon axis.
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Trans-Neptunian objects: More than meets the ice.
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Lowell Observatory, Flagstaff, AZ, USA. Email:
Eris, the second largest trans-Neptunian object (136199), melted early and maintains a warm ice conductive ice shell unlike Pluto.
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Nature
February 2023
Department of Earth, Atmospheric and Planetary Sciences, MIT, Cambridge, MA, USA.
Planetary rings are observed not only around giant planets, but also around small bodies such as the Centaur Chariklo and the dwarf planet Haumea. Up to now, all known dense rings were located close enough to their parent bodies, being inside the Roche limit, where tidal forces prevent material with reasonable densities from aggregating into a satellite. Here we report observations of an inhomogeneous ring around the trans-Neptunian body (50000) Quaoar.
View Article and Find Full Text PDFThe Formation of Bilobate Comet Shapes through Sublimative Torques.
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Purdue University, West Lafayette, IN.
Recent spacecraft and radar observations have found that ~70 percent of short-period comet nuclei, mostly Jupiter-family comets (JFCs), have bilobate shapes (two masses connected by a narrow neck). This is in stark contrast to the shapes of asteroids of similar sizes, of which ~14% are bilobate. This suggests that a process or mechanism unique to comets is producing these shapes.
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