INTERPRETATION OF (596) SCHEILA'S TRIPLE DUST TAILS

被引：41

作者：

Ishiguro, Masateru ^{[1
]}

Hanayama, Hidekazu ^{[2
]}

Hasegawa, Sunao ^{[3
]}

Sarugaku, Yuki ^{[3
]}

Watanabe, Jun-ichi ^{[2
,4
]}

Fujiwara, Hideaki ^{[5
]}

Terada, Hiroshi ^{[5
]}

Hsieh, Henry H. ^{[6
]}

Vaubaillon, Jeremie J. ^{[7
]}

Kawai, Nobuyuki ^{[8
]}

Yanagisawa, Kenshi ^{[9
]}

Kuroda, Daisuke ^{[9
]}

Miyaji, Takeshi ^{[2
,4
]}

Fukushima, Hideo ^{[2
,4
]}

Ohta, Kouji ^{[10
]}

Hamanowa, Hiromi ^{[11
]}

Kim, Junhan

Pyo, Jeonghyun ^{[12
]}

Nakamura, Akiko M. ^{[13
]}

机构：

[1] Seoul Natl Univ, Dept Phys & Astron, Seoul 151742, South Korea

[2] Natl Astron Observ Japan, Ishigakijima Astron Observ, Ishigaki, Okinawa 9070024, Japan

[3] JAXA, ISAS, Sagamihara, Kanagawa 2525210, Japan

[4] Natl Astron Observ Japan, Tokyo 1818588, Japan

[5] Natl Astron Observ Japan, Subaru Telescope, Hilo, HI 96720 USA

[6] Univ Hawaii, Inst Astron, Honolulu, HI 96822 USA

[7] IMCCE, Observ Paris, FR-75014 Paris, France

[8] Tokyo Inst Technol, Dept Phys, Meguro Ku, Tokyo 1528551, Japan

[9] Natl Astron Observ Japan, Okayama Astrophys Observ, Asaguchi, Okayama 7190232, Japan

[10] Kyoto Univ, Dept Astron, Sakyo Ku, Kyoto 6068502, Japan

[11] Hamanowa Astron Observ, Fukushima 9691204, Japan

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

[13] Kobe Univ, Dept Earth & Planetary Sci, Nada Ku, Kobe, Hyogo 6578501, Japan

来源：

ASTROPHYSICAL JOURNAL LETTERS | 2011年 / 741卷 / 01期

基金：

新加坡国家研究基金会;

关键词：

comets: general; comets: individual ((596) Scheila); minor planets; asteroids:; general; PHYSICAL-PROPERTIES; TRAIL; DEBRIS;

D O I：

10.1088/2041-8205/741/1/L24

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Strange-looking dust cloud around asteroid (596) Scheila was discovered on 2010 December 11.44-11.47. Unlike normal cometary tails, it consisted of three tails and faded within two months. We constructed a model to reproduce the morphology of the dust cloud based on the laboratory measurement of high-velocity impacts and the dust dynamics. As a result, we succeeded in reproducing the peculiar dust cloud by an impact-driven ejecta plume consisting of an impact cone and downrange plume. Assuming an impact angle of 45 degrees, our model suggests that a decameter-sized asteroid collided with (596) Scheila from the direction of (alpha(im), delta(im)) = (60 degrees, -40 degrees) in J2000 coordinates on 2010 December 3. The maximum ejection velocity of the dust particles exceeded 100 m s(-1). Our results suggest that the surface of (596) Scheila consists of materials with low tensile strength.

引用

页数：5

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