Ryugu's surface seen from Hayabusa2's remote-sensing observations

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Presentation transcript:

Ryugu's surface seen from Hayabusa2's remote-sensing observations E. Tatsumi (Univ. of Tokyo), L. Le Corre (PSI), D. Domingue (PSI), ONC team and TIR team

Optical Navigation Camera (ONC) ONC-T (Telescopic Optical Navigation Camera) Band-pass filter ul b v Na w x p Wavelength (µm) 0.40 0.48 0.55 0.59 0.70 0.86 0.95 Kameda et al. (2017), Suzuki et al. (2018), Tatsumi et al. (submitted)

Remote-sensing observations Alt. June July August September October November December 2019 Approach Conjunction TDs Box-A 20km Box-B (South pole) 5-7km Box-C Mid-alt Box-C 1km Gravity measurement TD-RH1 50-60m MINERVA MASCOT TD-RH1A 20m TD-RH3 Image credit : JAXA/UTokyo/Kochi U/Rikkyo U/Nagoya U/Chiba Inst Tech/Meiji U/U Aizu/AIST

Touch Down Rehearsal (ONC-W1) on 14-15 October Sequence of Touch Down Rehearsal (ONC-W1) on 14-15 October ここにW1動画を貼る Descent start alt.: 234m Minimum alt.: 23m Ascent end alt.: 367m

An Image from Touch Down Rehearsal on 14-15 October The highest resolution (5 mm/pix) of asteroid surface! Credit : JAXA/UTokyo/Kochi U/Rikkyo U/Nagoya U/Chiba Inst Tech/Meiji U/U Aizu/AIST

Similarity between Ryugu and Bennu ~ 1 km 162173 Ryugu ~550 m 101955 Bennu (Nolan et al., 2013) Both are the Apollo group near Earth asteroids. Both probably came from the inner asteroid main belt. Both are top-shaped. Credit : JAXA/UTokyo/Kochi U/Rikkyo U/Nagoya U/Chiba Inst Tech/Meiji U/U Aizu/AIST Albedo 0.047 +/- 0.003 (Ishiguro et al., 2014) 0.046 +/- 0.005 (Hergenrother et al., 2013) Spectral Type (Tholen taxonomy) C B

False Color Image of Ryugu and Bennu North pole Otohime 162173 Ryugu False Color Image of Ryugu and Bennu False color images based on spectrophotometry. (R:p/v, G:w/v, B:b/v) Otohime is the largest boulder on Ryugu. A face of Otohime has blue color similar to Bennu. 101955 Bennu (Nolan et al., 2013) Ryugu is generally homogeneous in color and spectra. When we looked at local surface features in detail, we found a great variety of heterogeneity. For example, the reflectance spectrum of one side on the Otohime boulder is very similar to that of Bennu.