@inproceedings{oai:jaxa.repo.nii.ac.jp:00020440,
 author = {北里, 宏平 and 安部, 正真 and 石黒, 正晃 and Kitazato, Kohei and Abe, Masanao and Ishiguro, Masateru},
 book = {第40回月・惑星シンポジウム, Proceedings of the 40th ISAS Lunar and Planetary Symposium},
 month = {Jul},
 note = {The Hayabusa (MUSES-C: Asteroid Sample-return Spacecraft) mission revealed fundamental physical properties of the small near-Earth asteroid 25143 Itokawa, such as shape and mass, during its rendezvous with the asteroid in 2005. Resulting from this the YORP (Yarkovsky-O'Keefe-Radziervskii-Paddack)-induced change in asteroid's spin state has been predicted theoretically. The purpose of this study is to investigate the YORP effect for Itokawa directly from an observational perspective. A long-term campaign of ground-based photometric observations of Itokawa were performed from March 2001 to December 2006. The observed asteroid lightcurves were compared with numerical modeling using the detailed shape model and global surface photometric properties derived from the Hayabusa mission. As a non-linear time evolution of rotational phase lag is shown, we found that Itokawa has been decreasing its spin rate by omega dot = -1.2 (+/- 0.2) x 10(exp -17) rad s(exp -2). The detected deceleration rate is almost consistent with, but slightly smaller than, the theoretically predicted value due to YORP effect., 資料番号: AA0063723020},
 pages = {82--85},
 publisher = {宇宙航空研究開発機構宇宙科学研究本部, Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (JAXA/ISAS)},
 title = {Direct detection of YORP effect on asteroid Itokawa},
 year = {2007}
}