报告题目：Astronomical Observations Using SARA telescopes
报 告 人：Xianming L. Han 教授（Butler University）
摘 要：During the 2014-2015 observation season, we carried out extensive observational studies of asteroids, Jovian satellites, and binary star systems.
Studying spin and shapes of asteroids provides us important information for understanding asteroid structures and their physical processes. Sending spaceships to a large number of asteroids is financially unpractical. However, we can obtained asteroid spin and shape information using ground based telescope via long term observations. Combining our new data with previous observations, we have obtained spin and shapes for asteroids 346 Hermentaria and 168 Sibylla.
Observing Jovian satellite mutual occultation and eclipses can provide highly accurate astrometric data for these satellites, which in turn will allow us to refine their orbits. These mutual events only occur when the Earth and the Sun happen to be located very close to the Jovian satellite orbital planes, which happen twice during each of Jupiter’s orbital motion around the sun. Since Jupiter’s orbital period is twelve years, these observation opportunities occur once every six years, and the most recent opportunity is from fall 2014 to summer 2015. We took advantage of this opportunity, and will talk about our observation details and astrometric results, and will compare them with the current ephemerides.
Observing eclipsing binary star systems allows us to obtain important information for stellar evolution, such as a star’s mass, size, temperature, orbital parameters around each other, and magnetic activities. We will present our preliminary results for revised orbital parameters, starspot parameters and stellar flare events for binary star systems DV Psc and BX Tri.
If telescope is available and weather is favorable, we will also demonstrate remote observations via the Internet.
时 间：2015年7月29日 星期三 下午15:00
地 点：（北京西路2号）紫台大楼517会议室
联系人：董瑶（83332059）
欢迎大家积极参加！
紫金山天文台学术委员会
