Watanabe S, Hirabayashi M, Hirata N, Hirata Na, Noguchi R, Shimaki Y, Ikeda H, Tatsumi E, Yoshikawa M, Kikuchi S, Yabuta H, Nakamura T, Tachibana S, Ishihara Y, Morota T, Kitazato K, Sakatani N, Matsumoto K, Wada K, Senshu H, Honda C, Michikami T, Takeuchi H, Kouyama T, Honda R, Kameda S, Fuse T, Miyamoto H, Komatsu G, Sugita S, Okada T, Namiki N, Arakawa M, Ishiguro M, Abe M, Gaskell R, Palmer E, Barnouin O S, Michel P, French A S, McMahon J W, Scheeres D J, Abell P A, Yamamoto Y, Tanaka S, Shirai K, Matsuoka M, Yamada M, Yokota Y, Suzuki H, Yoshioka K, Cho Y, Tanaka S, Nishikawa N, Sugiyama T, Kikuchi H, Hemmi R, Yamaguchi T, Ogawa N, Ono G, Mimasu Y, Yoshikawa K, Takahashi T, Takei Y, Fujii A, Hirose C, Iwata T, Hayakawa M, Hosoda S, Mori O, Sawada H, Shimada T, Soldini S, Yano H, Tsukizaki R, Ozaki M, Iijima Y, Ogawa K, Fujimoto M, Ho T-M, Moussi A, Jaumann R, Bibring J-P, Krause C, Terui F, Saiki T, Nakazawa S, Tsuda Y
Nagoya University, Nagoya 464-8601, Japan.
Institute of Space and Astronautical Science (ISAS), Japan Aerospace Exploration Agency (JAXA), Sagamihara 252-5210, Japan.
Science. 2019 Apr 19;364(6437):268-272. doi: 10.1126/science.aav8032. Epub 2019 Mar 19.
The Hayabusa2 spacecraft arrived at the near-Earth carbonaceous asteroid 162173 Ryugu in 2018. We present Hayabusa2 observations of Ryugu's shape, mass, and geomorphology. Ryugu has an oblate "spinning top" shape, with a prominent circular equatorial ridge. Its bulk density, 1.19 ± 0.02 grams per cubic centimeter, indicates a high-porosity (>50%) interior. Large surface boulders suggest a rubble-pile structure. Surface slope analysis shows Ryugu's shape may have been produced from having once spun at twice the current rate. Coupled with the observed global material homogeneity, this suggests that Ryugu was reshaped by centrifugally induced deformation during a period of rapid rotation. From these remote-sensing investigations, we identified a suitable sample collection site on the equatorial ridge.
隼鸟2号宇宙飞船于2018年抵达近地碳质小行星162173龙宫。我们展示了隼鸟2号对龙宫的形状、质量和地貌的观测结果。龙宫呈扁球形的“陀螺”形状，有一条明显的圆形赤道脊。其堆积密度为每立方厘米1.19±0.02克，表明其内部孔隙率很高（>50%）。表面的大型巨石表明其为碎石堆结构。表面坡度分析显示，龙宫的形状可能是由于其曾经以当前速度两倍的速度旋转而形成的。再加上观测到的全球物质均匀性，这表明龙宫在快速旋转期间因离心诱导变形而重塑。通过这些遥感调查，我们在赤道脊上确定了一个合适的样本采集点。
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