Therefore, understanding cometary evolution and the associated physical/chemical processes affecting cometary materials is essential to their utility as a window into the formation of the Solar system. Modern observations, however, only give us access to the current-day surfaces of comets, which have been altered to unknown and varying degrees throughout the age of the Solar system (Basilevsky & Keller 2006). Analysing cometary materials in situ can reveal some of these events by constraining the origin of the solid protoplanetary materials and the processes by which all larger bodies grew. These correlations suggest a strong seasonal forcing on the surface evolution of 67P/C-G, where materials are transported from the Southern hemisphere to Northern hemisphere basins over multiple orbital time-scales.Ĭomets: general, comets: individual: 67P/Churyumov–Gerasimenko 1 INTRODUCTIONĬomets are among the oldest objects in our Solar system, and represent the remnant materials from which all the outer planets and moons were constructed. We observe no obvious differences between the comet’s two lobes, with the only longitudinal variations being the Imhotep and Hatmehit basins. Equatorial latitudes are dominated by smooth terrain units that show evidence for flow structures. Layered bedrock units that represent the exposed nucleus of 67P/C-G are dominant at southern latitudes, while topographically smooth, dust covered regions dominate the Northern hemisphere. Our mapping reveals strong latitudinal dependences for emplaced units and a highly heterogeneous surface. Our mapping describes the landscapes of 67P/C-G when they were first observed by Rosetta, and our map can be used to detect changes in surface morphologies after its perihelion passage.
Relative to other nuclei, 67P/C-G appears most similar to 81P/Wild 2, with a topographically heterogeneous surface dominated by smooth-floored pits. Our work also puts into greater context the morphologies studied in previous works, and also the morphologies observed on previously visited cometary nuclei. Imagery of the Southern hemisphere was included in our study, allowing us to compare the contrasting hemispheres of 67P/C-G in a single study.
The images used in our study were acquired between 2014 August and 2015 May, before 67P/C-G passed through perihelion. Continued abuse of our services will cause your IP address to be blocked indefinitely.We present a global geomorphological map of comet 67P/Churyumov–Gerasimenko (67P/C-G) using data acquired by the Rosetta Orbiter’s OSIRIS Narrow Angle Camera. Please fill out the CAPTCHA below and then click the button to indicate that you agree to these terms. If you wish to be unblocked, you must agree that you will take immediate steps to rectify this issue. If you do not understand what is causing this behavior, please contact us here. If you promise to stop (by clicking the Agree button below), we'll unblock your connection for now, but we will immediately re-block it if we detect additional bad behavior. Overusing our search engine with a very large number of searches in a very short amount of time.Using a badly configured (or badly written) browser add-on for blocking content.
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