FOSSIL. II. The Rotation Periods of Small-sized Hilda Asteroids

被引：6

作者：

Chang, Chan-Kao ^{[1
]}

Chen, Ying-Tung ^{[1
]}

Fraser, Wesley C. ^{[1
,2
,8
]}

Lehner, Matthew J. ^{[1
,3
,4
]}

Wang, Shiang-Yu ^{[1
]}

Alexandersen, Mike ^{[4
]}

Choi, Young-Jun ^{[5
]}

Contreras, A. Paula Granados ^{[1
]}

Ito, Takashi ^{[6
]}

JeongAhn, Youngmin ^{[5
]}

Ji, Jianghui ^{[7
]}

Kavelaars, J. J. ^{[2
,8
]}

Kim, Myung-Jin ^{[5
]}

Lawler, Samantha M. ^{[9
,10
]}

Li, Jian ^{[11
,12
]}

Lin, Zhong-Yi ^{[13
]}

Lykawka, Patryk Sofia ^{[14
]}

Moon, Hong-Kyu ^{[5
]}

More, Surhud ^{[15
,16
]}

Munoz-Gutierrez, Marco ^{[1
]}

Ohtsuki, Keiji ^{[17
]}

Pike, Rosemary E. ^{[4
]}

Terai, Tsuyoshi ^{[18
]}

Urakawa, Seitaro ^{[19
]}

Yoshida, Fumi ^{[20
,21
]}

Zhang, Hui ^{[22
]}

Zhao, Haibin ^{[7
,23
]}

Zhou, Ji-Lin ^{[11
]}

机构：

[1] Acad Sinica, Inst Astron & Astrophys, 1,Sec 4,Roosevelt Rd, Taipei 10617, Taiwan

[2] Natl Res Council Canada, Herzberg Astron & Astrophys Res Ctr, 5071 West Saanich Rd, Victoria, BC V9E 2E7, Canada

[3] Univ Penn, Dept Phys & Astron, 209 South 33rd St, Philadelphia, PA 19125 USA

[4] Harvard & Smithsonian, Ctr Astrophys, 60 Garden St, Cambridge, MA 02138 USA

[5] Korea Astron & Space Sci Inst, 776 Daedeok Daero, Daejeon 34055, South Korea

[6] Natl Astron Observ Japan, Ctr Computat Astrophys, Osawa 2-21-1, Mitaka, Tokyo 1818588, Japan

[7] Chinese Acad Sci, Purple Mt Observ, CAS Key Lab Planetary Sci, Nanjing 210023, Peoples R China

[8] Univ Victoria, Dept Phys & Astron, Victoria, BC V8W 2Y2, Canada

[9] Univ Regina, Camp Coll, 3737 Wascana Pkwy, Regina, SK S4S 0A2, Canada

[10] Univ Regina, Dept Phys, 3737 Wascana Pkwy, Regina, SK S4S 0A2, Canada

[11] Nanjing Univ, Sch Astron & Space Sci, 163 Xianlin Ave, Nanjing 210023, Peoples R China

[12] Nanjing Univ, Key Lab Modern Astron & Astrophys, Minist Educ, Nanjing 210023, Peoples R China

[13] Natl Cent Univ, Inst Astron, 300 Zhongda Rd, Taoyuan 32001, Taiwan

[14] Kindai Univ, Sch Interdisciplinary Social & Human Sci, Shinkamikosaka 228-3, Higashiosaka, Osaka 5770813, Japan

[15] Interuniv Ctr Astron & Astrophys, Pune 411007, Maharashtra, India

[16] Kavli Inst Phys & Math Universe WPI, 5-1-5 Kashiwanoha, Kashiwa, Chiba 2778583, Japan

[17] Kobe Univ, Dept Planetol, Kobe, Hyogo 6578501, Japan

[18] Natl Astron Observ Japan, Subaru Telescope, 650 North Aohoku Pl, Hilo, HI 96720 USA

[19] Japan Spaceguard Assoc, Bisei Spaceguard Ctr, 1716-3 Okura, Okayama 7141411, Japan

[20] Univ Occupat & Environm Hlth, 1-1 Iseigaoka, Yahata, Kitakyusyu 8078555, Japan

[21] Chiba Inst Technol, Planetary Explorat Res Ctr, 2-17-1 Tsudanuma, Narashino, Chiba 2750016, Japan

[22] Chinese Acad Sci, Shanghai Astron Observ, 80 Nandan Rd, Shanghai 200030, Peoples R China

[23] Chinese Acad Sci, CAS Ctr Excellence Comparat Planetol, Hefei 230026, Peoples R China

来源：

ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES | 2022年 / 259卷 / 01期

基金：

中国国家自然科学基金; 新加坡国家研究基金会;

关键词：

TROJAN ASTEROIDS; JUPITER TROJANS; FAST-ROTATORS; SOLAR-SYSTEM; CAPTURE; PATROCLUS;

D O I：

10.3847/1538-4365/ac50ac

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Using the high-cadence lightcurves collected from the FOSSIL survey, rotation periods of 17 small (diameter 1 km < D < 3 km) Hilda asteroids (hereinafter Hildas) were obtained. Combined with the previously measured rotation periods of Hildas, a spin-rate limit appears at around 3 hr. Assuming rubble-pile structures for the Hildas, a bulk density of similar to 1.5 g cm(-3) is required to withstand this spin-rate limit. This value is similar to that of the C-type asteroids (1.33 g cm(-3)) and higher than the similar to 1 g cm(-3) bulk density of the Jupiter Trojans. This suggests that the Hildas population may contain more C-type asteroids than expected, and the limit at 3 hr simply reflects the spin-rate limit for C-type asteroids. In addition, a Hilda superfast rotator was found, which has a rotation period of 1.633 hr and an estimated diameter of 0.7 km. This object is unlikely to be explained by a rubble-pile or monolithic structure.

引用

页数：8

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