Observational Characterization of Main-Belt Comet and Candidate Main-Belt Comet Nuclei

分类： 天文学 >> 天文学 提交时间： 2023-02-19

Henry H. Hsieh Marco Micheli Michael S. P. Kelley Matthew M. Knight Nicholas A. Moskovitz Jana Pittichova Scott S. Sheppard Audrey Thirouin Chadwick A. Trujillo Richard J. Wainscoat Robert J. Weryk Quanzhi Ye

摘要： We report observations of nine MBCs or candidate MBCs, most of which were obtained when the targets were apparently inactive. We find effective nucleus radii (assuming albedos of p_V=0.05+/-0.02) of r_n=(0.24+/-0.05) km for 238P/Read, r_n=(0.9+/-0.2) km for 313P/Gibbs, r_n=(0.6+/-0.1) km for 324P/La Sagra, r_n=(1.0+/-0.2) km for 426P/PANSTARRS, r_n=(0.5+/-0.1) km for 427P/ATLAS, r_n80% have r_n<1.0 km, pointing to an apparent physical preference toward small MBCs, where we suggest that YORP spin-up may play a significant role in triggering and/or facilitating MBC activity.

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