Format

Send to

Choose Destination
Science. 2019 Apr 19;364(6437):252. doi: 10.1126/science.aaw0422. Epub 2019 Mar 19.

The geomorphology, color, and thermal properties of Ryugu: Implications for parent-body processes.

Author information

1
The University of Tokyo, Tokyo 113-0033, Japan. sugita@eps.s.u-tokyo.ac.jp.
2
Planetary Exploration Research Center, Chiba Institute of Technology, Narashino 275-0016, Japan.
3
Kochi University, Kochi 780-8520, Japan.
4
Nagoya University, Nagoya 464-8601, Japan.
5
Rikkyo University, Tokyo 171-8501, Japan.
6
Institute of Space and Astronautical Science (ISAS), Japan Aerospace Exploration Agency (JAXA), Sagamihara 252-5210, Japan.
7
The University of Tokyo, Tokyo 113-0033, Japan.
8
University of Aizu, Aizu-Wakamatsu 965-8580, Japan.
9
National Institute of Advanced Industrial Science and Technology, Tokyo 135-0064 Japan.
10
Kobe University, Kobe 657-8501, Japan.
11
Meiji University, Kawasaki 214-8571, Japan.
12
National Astronomical Observatory of Japan, Mitaka 181-8588, Japan.
13
SOKENDAI (The Graduate University for Advanced Studies), Hayama 240-0193, Japan.
14
Planetary Science Institute, Tucson, AZ 85719, USA.
15
Auburn University, Auburn, AL 36849, USA.
16
Tohoku University, Sendai 980-8578, Japan.
17
Brown University, Providence, RI 02912, USA.
18
Kindai University, Higashi-Hiroshima 739-2116, Japan.
19
Université Côte d'Azur, Observatoire de la Côte d'Azur, Centre National de le Recherche Scientifique (CNRS), Laboratoire Lagrange, 06304 Nice, France.
20
University of Arizona, Tucson, AZ 85705, USA.
21
Johns Hopkins University Applied Physics Laboratory, Laurel, MD 20723, USA.
22
German Aerospace Center (DLR), Institute of Planetary Research, 12489 Berlin, Germany.
23
International Research School of Planetary Sciences, Università d'Annunzio, 65127 Pescara, Italy.
24
Ashikaga University, Ashikaga 326-8558, Japan.
25
Hokkaido University of Education, Asahikawa 070-8621, Japan.
26
Max-Planck-Institut für Extraterrestrische Physik, 85748 Garching, Germany.
27
University of Stirling, FK9 4LA, Scotland, UK.
28
Research and Development Directorate, JAXA, Sagamihara 252-5210, Japan.
29
Nihon University, Funabashi 274-8501, Japan.
30
Osaka University, Toyonaka 560-0043, Japan.
31
Hitotsubashi University, Tokyo 186-8601, Japan.
32
Hiroshima University, Higashi-Hiroshima 739-8526, Japan.
33
Seoul National University, Seoul 08826, Korea.
34
NASA Johnson Space Center, Houston, TX 77058, USA.
35
Laboratoire d'Etudes Spatiales et d'Instrumentation en Astrophysique (LESIA)-Observatoire de Paris, Paris Sciences et Lettres (PSL), Centre National de le Recherche Scientifique (CNRS), Sorbonne Université, Université Paris-Diderot, 92195 Meudon Principal Cedex, France.

Abstract

The near-Earth carbonaceous asteroid 162173 Ryugu is thought to have been produced from a parent body that contained water ice and organic molecules. The Hayabusa2 spacecraft has obtained global multicolor images of Ryugu. Geomorphological features present include a circum-equatorial ridge, east-west dichotomy, high boulder abundances across the entire surface, and impact craters. Age estimates from the craters indicate a resurfacing age of [Formula: see text] years for the top 1-meter layer. Ryugu is among the darkest known bodies in the Solar System. The high abundance and spectral properties of boulders are consistent with moderately dehydrated materials, analogous to thermally metamorphosed meteorites found on Earth. The general uniformity in color across Ryugu's surface supports partial dehydration due to internal heating of the asteroid's parent body.

PMID:
30890587
DOI:
10.1126/science.aaw0422

Supplemental Content

Full text links

Icon for HighWire
Loading ...
Support Center