Thermo-physical properties of 162173 (1999 JU3), a potential flyby and rendezvous target for interplanetary missions

被引：63

作者：

Mueller, T. G. ^{[1
]}

Durech, J. ^{[2
]}

Hasegawa, S. ^{[3
]}

Abe, M. ^{[3
]}

Kawakami, K. ^{[3
]}

Kasuga, T. ^{[4
]}

Kinoshita, D. ^{[5
]}

Kuroda, D. ^{[6
]}

Urakawa, S. ^{[7
]}

Okumura, S. ^{[7
]}

Sarugaku, Y. ^{[8
]}

Miyasaka, S. ^{[9
]}

Takagi, Y. ^{[10
]}

Weissman, P. R. ^{[11
]}

Choi, Y-J ^{[12
]}

Larson, S. ^{[13
]}

Yanagisawa, K. ^{[6
]}

Nagayama, S. ^{[14
]}

机构：

[1] Max Planck Inst Extraterr Phys, D-85748 Garching, Germany

[2] Charles Univ Prague, Fac Math & Phys, Astron Inst, CR-18000 Prague 8, Czech Republic

[3] Japan Aerosp Explorat Agcy, Inst Space & Astronaut Sci, Sagamihara, Kanagawa 2298510, Japan

[4] Univ Western Ontario, Dept Phys & Astron, London, ON N6A 3K7, Canada

[5] Natl Cent Univ, Inst Astron, Tao Yuan 32001, Taiwan

[6] Natl Astron Observ Japan, Okayama Astrophys Observ, Okayama 7190232, Japan

[7] Japan Spaceguard Assoc, Bisei Spaceguard Ctr, Okayama 7141411, Japan

[8] Univ Tokyo, Inst Astron, Kiso Observ, Nagano 3970101, Japan

[9] Tokyo Metropolitan Govt, Shinjuku Ku, Tokyo 1638001, Japan

[10] Aichi Toho Univ, Aichi 4688515, Japan

[11] CALTECH, Jet Prop Lab, Pasadena, CA 91109 USA

[12] Korea Astron & Space Sci Inst, Taejon 305348, South Korea

[13] Univ Arizona, Lunar & Planetary Lab, Tucson, AZ 85721 USA

[14] Natl Astron Observ Japan, Mitaka, Tokyo 1818588, Japan

来源：

ASTRONOMY & ASTROPHYSICS | 2011年 / 525卷

关键词：

minor planets; asteroids:; individual:; 162173; (1999; JU3); radiation mechanisms: thermal; techniques: photometric; infrared: planetary systems; INFRARED OBSERVATIONS; ASTEROIDS; STANDARDS; HAYABUSA; ITOKAWA; SHAPE;

D O I：

10.1051/0004-6361/201015599

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Context. Near-Earth asteroid 162173 (1999 JU3) is a potential flyby and rendezvous target for interplanetary missions because of its easy-to-reach orbit. The physical and thermal properties of the asteroid are relevant for establishing the scientific mission goals and also important in the context of near-Earth object studies in general. Aims. Our goal was to derive key physical parameters such as shape, spin-vector, size, geometric albedo, and surface properties of 162173 (1999 JU3). Methods. With three sets of published thermal observations (ground-based N-band, Akari IRC, Spitzer IRS), we applied a thermophysical model to derive the radiometric properties of the asteroid. The calculations were performed for the full range of possible shape and spin-vector solutions derived from the available sample of visual lightcurve observations. Results. The near-Earth asteroid 162173 (1999 JU3) has an effective diameter of 0.87 +/- 0.03 km and a geometric albedo of 0.070 +/- 0.006. The chi(2)-test reveals a strong preference for a retrograde sense of rotation with a spin-axis orientation of lambda(ecl) = 73 degrees, beta(ecl) = -62 degrees and P-sid = 7.63 +/- 0.01 h. The most likely thermal inertia ranges between 200 and 600 Jm(-2) s(-0.5) K-1, about a factor of 2 lower than the value for 25143 Itokawa. This indicates that the surface lies somewhere between a thick-dust regolith and a rock/boulder/cm-sized, gravel-dominated surface like that of 25143 Itokawa. Our analysis represents the first time that shape and spin-vector information has been derived from a combined data set of visual lightcurves (reflected light) and mid-infrared photometry and spectroscopy (thermal emission).

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