论文标题

Hayabusa2对吉祥物着陆区的表征

Characterization of the MASCOT landing area by Hayabusa2

论文作者

Schröder, Stefan, Sakatani, Naoya, Honda, Rie, Tatsumi, Eri, Yokota, Yasuhiro, Domingue, Deborah, Cho, Yuichiro, Kameda, Shingo, Kitazato, Kohei, Kouyama, Toru, Matsuoka, Moe, Miura, Akira, Morota, Tomokatsu, Okada, Tatsuaki, Sawada, Hirotaka, Senshu, Hiroki, Shimaki, Yuri, Sugita, Seiji, Tanaka, Satoshi, Yabuta, Hikaru, Yamada, Manabu, Grott, Matthias, Hamm, Maximilian, Ho, Tra-Mi, Jaumann, Ralf, Mottola, Stefano, Otto, Katharina, Schmitz, Nicole, Scholten, Frank

论文摘要

语境。在C-Type小行星Ryugu上降落后,吉祥物在一块小岩石中成像了鲜艳的,亚毫米大小的夹杂物。 Hayabusa2成功地从Ryugu表面返回了一个小颗粒样品,但这些似乎都没有带有这样的夹杂物。样品被认为是Ryugu的代表。目标。为了了解吉祥物观察和Ryugu样品之间明显的差异,我们评估吉祥物着陆点和岩石是否暗示,对于Ryugu来说可能是非典型的。方法。我们分析了船上三种仪器Hayabusa2:摄像头(ONC),近红外光谱仪(NIRS3)和一个热红外成像仪(TIR)获得的吉祥物着陆区的观察结果。我们将其检索到的着陆面积特性与平均Ryugu表面的降落区域进行了比较。结果。我们在着陆区选择了几个区域和地形进行分析:一个小火山口,一堆光滑的岩石和着陆点本身。火山口相对蓝,岩石相对红。着陆位点的光谱和热物理特性非常接近平均Ryugu表面。吉祥物岩石的光谱特性可能接近平均水平,但其热惯性可能更高。结论。吉祥物岩石也可以被认为是Ryugu的代表。由于它们的非典型光谱特性,返回样品中的一些亚毫米大小的颗粒脱颖而出。这样的颗粒可能是吉祥物岩石中的夹杂物。

Context. After landing on C-type asteroid Ryugu, MASCOT imaged brightly colored, submillimeter-sized inclusions in a small rock. Hayabusa2 successfully returned a sample of small particles from the surface of Ryugu, but none of these appear to harbor such inclusions. The samples are considered representative of Ryugu. Aims. To understand the apparent discrepancy between MASCOT observations and Ryugu samples, we assess whether the MASCOT landing site, and the rock by implication, is perhaps atypical for Ryugu. Methods. We analyzed observations of the MASCOT landing area acquired by three instruments on board Hayabusa2: a camera (ONC), a near-infrared spectrometer (NIRS3), and a thermal infrared imager (TIR). We compared the landing area properties thus retrieved with those of the average Ryugu surface. Results. We selected several areas and landforms in the landing area for analysis: a small crater, a collection of smooth rocks, and the landing site itself. The crater is relatively blue and the rocks are relatively red. The spectral and thermophysical properties of the landing site are very close to those of the average Ryugu surface. The spectral properties of the MASCOT rock are probably close to average, but its thermal inertia may be somewhat higher. Conclusions. The MASCOT rock can also be considered representative of Ryugu. Some of the submillimeter-sized particles in the returned samples stand out because of their atypical spectral properties. Such particles may be present as inclusions in the MASCOT rock.

扫码加入交流群

加入微信交流群

微信交流群二维码

扫码加入学术交流群,获取更多资源