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協辦單位
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名稱Title
2018天文年會
國立金門大學
5月18日至20日

論文摘要

A Joint Study of the Spin Rate Distribution of the Main-Belt Asteroids Using the CNEOST at Xu-Yi Observatory

[ Poster PS12 ]

Ting-Shuo Yeh (葉庭碩), Bin Li (李彬), Chan-Kao Chang (章展誥), Hai-Bin Zhao (趙海斌), Jian-Hui Ji (季江徽), Zhong-Yi Lin (林忠義) and Wing-Huen Ip(葉永烜)

Several important physical properties of asteroids can be derived from light curves, such as rotation periods, spin pole orientations, axial ratios estimated form the light curve amplitudes and shape models from light curve inversion. The interior structures (i.e., the 2.2 hr spin-rate limit of rubble-pile asteroids) and taxonomic type identification from the phase-curve relation can be derived. Moreover, the statistics on asteroid spin rates and pole orientations are also important to understand how asteroid rotation would be affected by various mechanisms (e.g., mutual collision, and the YORP effect). To have a comprehensive study on the aforementioned questions, it relies on a large sample of high-quality asteroidal light curves. Therefore, we initiated our cross-strait bilateral cooperation with the Purple Mountain Observatory (PMO) to collect asteroid light curves using the CNEOST (Chinese Near-Earth Object Survey Telescope) of the Purple Mountain Observatory (PMO) at Xu-Yi station. From a pilot survey of ~40 square degrees using 8-min cadence, we have 1650 light curves collected during February 27 -- March 2 2017, from which 82 highly reliable rotation periods were derived. During March 9 – March 12 2018, 2856 light curves were collected in a field of ~50 square degrees with a 10.6-min cadence, and 77 highly reliable rotation periods were derived. In this work, the preliminary results from this joint effort between NCU and PMO will be reported.