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Confirmation of Large Super-fast Rotator (144977) 2005 EC_(127)

Chang, Chan-Kao and Lin, Hsing-Wen and Ip, Wing-Huen and Lin, Zhong-Yi and Kupfer, Thomas and Prince, Thomas A. and Ye, Quan-Zhi and Laher, Russ R. and Lee, Hee-Jae and Moon, Hong-Kyu (2017) Confirmation of Large Super-fast Rotator (144977) 2005 EC_(127). Astrophysical Journal Letters, 840 (2). Art. No. L22. ISSN 2041-8213.

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(144977) 2005 EC_(127) is a V-/A-type inner-main-belt asteroid with a diameter of 0.6 ± 0.1 km. Asteroids of this size are believed to have rubble-pile structure, and therefore cannot have a rotation period shorter than 2.2 hr. However, our measurements show that asteroid 2005 EC_(127) completes one rotation in 1.65 ± 0.01 hr with a peak-to-peak light-curve variation of ~0.5 mag. Therefore, this asteroid is identified as a large super-fast rotator. Either a rubble-pile asteroid with a bulk density of ρ ~ 6 g cm^(−3) or an asteroid with an internal cohesion of 47 ± 30 Pa can explain 2005 EC_(127). However, the scenario of high bulk density is very unlikely for asteroids. To date, only six large super-fast rotators, including 2005 EC_(127), have been reported, and this number is very small when compared with the much more numerous fast rotators. We also note that none of the six reporting large SFRs are classified as C-type asteroids.

Item Type:Article
Related URLs:
URLURL TypeDescription
Chang, Chan-Kao0000-0003-1656-4540
Lin, Hsing-Wen0000-0001-7737-6784
Ip, Wing-Huen0000-0002-3140-5014
Lin, Zhong-Yi0000-0003-3827-8991
Kupfer, Thomas0000-0002-6540-1484
Prince, Thomas A.0000-0002-8850-3627
Ye, Quan-Zhi0000-0002-4838-7676
Laher, Russ R.0000-0003-2451-5482
Additional Information:© 2017 The American Astronomical Society. Received 2017 April 2; revised 2017 April 24; accepted 2017 April 27; published 2017 May 10. This work is supported in part by the Ministry of Science and Technology of Taiwan under grants MOST 104-2112-M-008-014-MY3, MOST 104-2119-M-008-024, and MOST 105-2112-M-008-002-MY3, and also by Macau Science and Technology Fund No. 017/2014/A1 of MSAR. We are thankful for the indispensable support provided by the staff of the Lulin Observatory and the staff of the Palomar Observatory. We thank the anonymous referee for useful suggestions and comments.
Group:Infrared Processing and Analysis Center (IPAC), Palomar Transient Factory, Astronomy Department
Funding AgencyGrant Number
Ministry of Science and Technology (Taipei)MOST 104-2112-M-008-014-MY3
Ministry of Science and Technology (Taipei)MOST 104-2119-M-008-024
Ministry of Science and Technology (Taipei)MOST 105-2112-M-008-002-MY3
Macau Science and Technology017/2014/A1
Subject Keywords:minor planets, asteroids: individual (144977) 2005 EC127
Issue or Number:2
Record Number:CaltechAUTHORS:20170512-104233877
Persistent URL:
Official Citation:Chan-Kao Chang et al 2017 ApJL 840 L22
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:77407
Deposited By: Tony Diaz
Deposited On:12 May 2017 19:56
Last Modified:09 Mar 2020 13:19

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