1. 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

2. 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)

3. 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

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

5. 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

6. Similarity between Ryugu and Bennu
~ 1 km
Ryugu
~550 m
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 /
(Ishiguro et al., 2014) /
(Hergenrother et al., 2013)
Spectral Type
(Tholen taxonomy) C B

7. False Color Image of Ryugu and Bennu
North pole
Otohime
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.
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.