| Autor: |
Yamada, Ryuhei, Yamamoto, Keiko, Oshigami, Shoko, Araki, Hiroshi, Senshu, Hiroki, Noda, Hirotomo, Namiki, Noriyuki, Matsumoto, Koji, Yoshida, Fumi, Abe, Shinsuke, Hirata, Naru, Sasaki, Sho, Mizuno, Takahide |
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| Zdroj: |
Earth, Planets & Space; 11/8/2022, Vol. 74 Issue 1, p1-18, 18p |
| Abstrakt: |
Japanese asteroid explorer Hayabusa2 arrived at C-type asteroid 162,173 Ryugu in June 2018. The laser altimeter (LIDAR) onboard Hayabusa2 measured its own transmitted laser and returned pulse intensities from a Ryugu surface until November 2019. Because the Ryugu surface is extremely rough, topography dominates over the material properties in the conventional derivation of normal albedo. Thus, we developed a method to retrieve the normal albedo from the rough surface of a C-type asteroid at a LIDAR laser wavelength of 1.064 μm. The albedo map covering an equatorial band between – 40° and + 20° in latitude was created with 3˚-by-3˚ resolution using the intensity data obtained before the conjunction of the spacecraft with the Sun. The average of the normal albedo is 0.0405 ± 0.0027, whereas approximately half of the 3°-by-3° grids are between 0.04 and 0.045. The low and uniform normal albedo feature is common to other remote-sensing observations of Ryugu by visible and near-infrared cameras onboard Hayabusa2. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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