Authors:
F. Preusker1*, F. Scholten1, S. Elgner1, K.-D. Matz1, S. Kameda2, T. Roatsch1, R. Jaumann1, S. Sugita3,4, R. Honda5, T. Morota3, E. Tatsumi3,6, Y. Cho3, K. Yoshioka7, H. Sawada8, Y. Yokota8, N. Sakatani8, M. Hayakawa8, M. Matsuoka8, M. Yamada4, T. Kouyama9, H. Suzuki10, C. Honda11, K. Ogawa12
Affiliations:
1 German Aerospace Center (DLR), Inst. of Planetary Research, D-12489 Berlin, Germany
2 Dept. of Physics, Rikkyo University, 3-34-1 Nishi-Ikebukuro, Toshima, Tokyo, Japan
3 University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo, Japan
4 Planetary Exploration Research Center, Chiba Institute of Technology, 2-17-1 Tsudanuma, Narashino, Chiba, Japan
5 Department of Information Science, Kochi University, 2-5-1 Akebono, Kochi, Japan
6 Instituto de Astrofisica de Canrias, University of La Laguna, Santa Cruz de Tenerife, Spain
7 Department of Complexity Science and Engineering, University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba, Japan
8 ISAS, JAXA, 3-3-1 Yoshinodai, Chuo, Sagamihara, Kanagawa, Japan
9 National Institute of Advanced Industrial Science and Technology, 2-3-26 Aomi, Koto, Tokyo, Japan
10 Department of Physics, Meiji University, 1-1-1 Higashimita, Tama, Kawasaki, Kanagawa, Japan
11 CAIST/ARC-Space, University of Aizu, Aizu-Wakamatsu, Fukushima, Japan
12 Department of Planetology, Kobe University, 1-1 Rokkodaicho, Nada, Kobe, Hyogo, Japan
*Correspondence to: Frank Preusker
Astronomy & Astrophysics, 634, L4 (2019) DOI: 10.1051/0004-6361/201936759
Abstract:
A high-resolution 3D surface model, map-projected to a digital terrain model (DTM), and precisely ortho-rectified context images (orthoimages) of MASCOT's landing site area are important data sets for the scientific analysis of relevant data sets that have been acquired from MASCOT's image camera system MASCam and from other instruments (e.g., the radiometer MARA and the magnetometer MASMag). We performed a stereo-photogrammetric (SPG) analysis of 1050 Hayabusa2 ONC-T/W images acquired during the asteroid characterization phase and the MASCOT release phase in early October 2018 to construct a photogrammetric control point network of asteroid (162173) Ryugu. We validated existing rotational parameters for Ryugu and improved the camera orientation (position and pointing) of the ONC images to decimeter accuracy using stereo-photogrammetric bundle block adjustment. We produced a high-resolution DTM of the entire MASCOT landing site area. Finally, based on this DTM, a set of orthoimages from the highest resolution ONC images around MASCOT's final rest position complements the results of this analysis.