Planetary and exoplanetary Astronomy Lunch Seminar (PALS) for 2022-11-28

Series: Planetary and exoplanetary Astronomy Lunch Seminar (PALS)
Date: Monday 28-November-2022
Time: 11:15-12:15
Location: Zoom (contact for link)
Speaker: Xian Shi
Title: Boulder ejection and mobilisation on comet 67P observed by Rosetta/OSIRIS

Abstract: With an unprecedented resolution, OSIRIS cameras on board ESA’s Rosetta mission witnessed a diversity of dust activity during over two years’ rendezvous with comet 67P/Churyumov-Gerasimenko. These observations show, besides nominal ‘jets’ and spontaneous outbursts, also ejections of boulders that are aggregates decimetres to metres in size. In this talk, I will introduce observations of various forms of boulder activity on 67P, and our investigation to explain possible underlying mechanisms. We found that such activity could be a significant part of the resurfacing process of the nucleus and contributes to the redistribution of icy materials.

For further information contact PALS coordinator Quanzhi Ye at


Special accommodations for individuals with disabilities can be made by calling (301) 405-3001. It would be appreciated if we are notified at least one week in advance.


Directions and information about parking can be found here.

This page was automatically generated on: 20-Nov-2022.