TY - JOUR
T1 - Albedo, size, and surface characteristics of Hayabusa-2 sample-return target 162173 1999 JU3 from AKARI and Subaru observations
AU - Hasegawa, Sunao
AU - Müller, Thomas G.
AU - Kawakami, Kyoko
AU - Kasuga, Toshihiro
AU - Wada, Takehiko
AU - Ita, Yoshifusa
AU - Takato, Naruhisa
AU - Terada, Hiroshi
AU - Fujiyoshi, Takuya
AU - Abe, Masanao
PY - 2008
Y1 - 2008
N2 - Mid-infrared observations of the Apollo-type asteroid 162173 1999 JU3 were performed in 2007 May during its close Earth approach with the AKARI space telescope and in 2007 August with the Subaru telescope. A thermophys-ical model analysis of the obtained data resulted in a radiometric diameter of 0.92 ± 0.12 km and a visual geometric albedo of 0.063-0.015 +0.020 The geometric albedo is typical for C-type asteroids. The solutions for the thermal inertia of 1999 JU3's surface material were not as clear as for the asteroid 25143 Itokawa due to less-favorable observing conditions. But the most likely solutions are connected to high thermal inertia values, indicating that the surface is predominantly covered bv boulders and bare rocks, while areas with thick dust reeolith are less common.
AB - Mid-infrared observations of the Apollo-type asteroid 162173 1999 JU3 were performed in 2007 May during its close Earth approach with the AKARI space telescope and in 2007 August with the Subaru telescope. A thermophys-ical model analysis of the obtained data resulted in a radiometric diameter of 0.92 ± 0.12 km and a visual geometric albedo of 0.063-0.015 +0.020 The geometric albedo is typical for C-type asteroids. The solutions for the thermal inertia of 1999 JU3's surface material were not as clear as for the asteroid 25143 Itokawa due to less-favorable observing conditions. But the most likely solutions are connected to high thermal inertia values, indicating that the surface is predominantly covered bv boulders and bare rocks, while areas with thick dust reeolith are less common.
KW - Infrared: Solar system
KW - Minor planets, asteroids
KW - Radiation mechanisms: Thermal
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U2 - 10.1093/pasj/60.sp2.s399
DO - 10.1093/pasj/60.sp2.s399
M3 - Article
AN - SCOPUS:59949106198
SN - 0004-6264
VL - 60
SP - S399-S405
JO - Publications of the Astronomical Society of Japan
JF - Publications of the Astronomical Society of Japan
IS - SPECIAL ISUE
ER -