题  目： Dawn at Vesta: A Whole New World

报告人：李荐扬  博士

(Department of Astronomy University of Maryland at College Park)

摘  要：Asteroids, as both the building blocks of and leftovers from the formation of our planetary system, retain important information about the processes of planet formation. Vesta is one of the largest asteroids, representing the early stage of terrestrial planet formation and the transition from planetesimals to a full-sized planet. Dawn spacecraft currently in orbit around Vesta returned a huge amount of multispectral imaging and spectroscopic data in the visible and near-infrared wavelengths at a scale as high as 20 m/pix, converting Vesta from an astronomical object to a whole new world of geology and mineralogy. Dawn data provide high-precision measurement of the basic properties of Vesta including its shape and gravity, and constrain its internal structure. Vesta displays a very heterogeneous surface in its albedos, colors, and spectra, suggesting an extremely diverse mineralogy that is probably related to its complicated impact history.  Vesta, as seen by Dawn, is a unique world full of surprises in many aspects.

时  间：2012年5月10日（星期四）下午15:00

地  点：（北京西路2号）紫台大楼517会议室

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