Friday, 29 March 2024

Astronomy Colloquium (3.8/2021): Sublimation induced shape and morphology evolution of small icy bodies

Calendar
研讨会日历
Date
03.08.2021 2:00 pm - 3:00 pm

Description

Title:  Sublimation induced shape and morphology evolution of small icy bodies

Speaker:  Yuhui Zhao(赵玉晖)

 

Abstract: Images of the solar system's small icy bodies show great varieties of nuclei shapes and morphologies on their surface. The formation and evolution mechanism of these shapes and surface features such as sinks, pits, cliffs, fractures and pinnacles may indicate a distinct thermal, dynamic and chemical history of the body. The unprecedented amount high resolution data obtained by the Rosetta mission to 67P/Churyumov-Gerasimenko (67P/CG) provided us an opportunity to better understand and further investigate properties of its shape and local surface morphologies and study in better details the process of sublimation in its role in shape evolution. Furthermore, recent results from NASA mission New Horizons revealed the unexpected flattened shape of the Kuiper Belt Object (486958) Arroktoh . How significant issublimation activities on small icy bodies at such large solar distance? Is it responsible for their peculiar shape formation. Combined with the MONET (mass-loss-driven shape evolution) model, we are able to qualitatively learn the sublimation induced shape and morphology evolution of small icy bodies.

 

Bio: Yuhui Zhao works in Purple Mountain Observatory as an associate professor. She got her PHD degree in Nanjing University in 2012 in astrometry and celestial mechanism. She is the PI of 4 NSFC projects and has published 25 papers in the field of celestial mechanism and planetary science, including publications in Nature Astronomy, MNRAS and A&A. She is interested in the study of cometary science, the dynamics of smallbodies, and the orbital mechanics of deep space missions. She has participated in the pre-study of orbital design of several Chinese space missions, including the sample return lunar missions and the Mars missionsand was involved in the implementation and data analysis of the CE-2’s Toutatis flyby mission. In recent years, she has participated in study of solar system small bodies combined with observational data obtained by space missions, mainly focusing on the dynamic history, rotational dynamics, shape formation and cometary activities. She is also in the scientific team of the SWI instrument on the JUICE mission currently in plan to lift off to the Jovian system in 2022 by ESA. 

 

Time:14:00-15:00, 8/March, Monday

Meeting ID: 831 4360 9634

Passcode: 436377

Joining Link: https://us02web.zoom.us/j/83143609634?pwd=K0tQcERUTzBldHp0emE0bEt3azNsQ