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Large Super-Fast Rotator Hunting Using the Intermediate Palomar Transient Factory

Chang, Chan-Kao and Lin, Hsing-Wen and Ip, Wing-Huen and Prince, Thomas A. and Kulkarni, Shrinivas R. and Levitan, David and Laher, Russ and Surace, Jason (2016) Large Super-Fast Rotator Hunting Using the Intermediate Palomar Transient Factory. Astrophysical Journal Supplement Series, 227 (2). Art. No. 20. ISSN 0067-0049.

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In order to look for large super-fast rotators, in late 2014 and early 2015, five dedicated surveys covering ~188 deg2 in the ecliptic plane have been carried out in the R-band, with ~10 minute cadence using the intermediate Palomar Transient Factory. Among 1029 reliable rotation periods obtained from the surveys, we discovered 1 new large super-fast rotator, (40511) 1999 RE88, and 18 other candidates. (40511) 1999 RE88 is an S-type inner main-belt asteroid with a diameter of D = 1.9 ± 0.3 km, a rotation period of P = 1.96 ± 0.01 hr, and a light curve amplitude of Δm ~ 1.0 mag. To maintain such fast rotation, an internal cohesive strength of ~780 Pa is required. Combining all known large super-fast rotators, their cohesive strengths all fall in the range of 100–1000 Pa of lunar regolith. However, the number of large super-fast rotators seems to be far less than the whole asteroid population. This might indicate a peculiar asteroid group for them. Although the detection efficiency for a long rotation period is greatly reduced due to our two-day observation time span, the spin-rate distributions of this work show consistent results with Chang et al. (2015), after considering the possible observational bias in our surveys. It shows a number decrease with an increase of spin rate for asteroids with a diameter of 3 ≤ D ≤ 15 km, and a number drop at a spin rate of f = 5 rev day^(−1) for asteroids with D ≤ 3 km.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Chang, Chan-Kao0000-0003-1656-4540
Lin, Hsing-Wen0000-0001-7737-6784
Ip, Wing-Huen0000-0002-3140-5014
Prince, Thomas A.0000-0002-8850-3627
Kulkarni, Shrinivas R.0000-0001-5390-8563
Laher, Russ0000-0003-2451-5482
Surace, Jason0000-0001-7291-0087
Additional Information:© 2016 American Astronomical Society. Received 2016 June 26. Accepted 2016 August 25. Published 2016 December 2. We would like to thank the anonymous referee for useful suggestions and comments. This work is supported in part by the National Science Council of Taiwan under the grants MOST 104-2112-M-008-014-MY3 and MOST 104-2119-M-008-024, and also by the Macau Science and Technology Fund No. 017/2014/A1 of MSAR. This publication makes use of data products from WISE, which is a joint project of the University of California, Los Angeles, and the Jet Propulsion Laboratory/California Institute of Technology, funded by the National Aeronautics and Space Administration. This publication also makes use of data products from NEOWISE, which is a project of the Jet Propulsion Laboratory/California Institute of Technology, funded by the Planetary Science Division of the National Aeronautics and Space Administration. We gratefully acknowledge the extraordinary services that are specific to NEOWISE that are contributed by the International Astronomical Union's Minor Planet Center, operated by the Harvard-Smithsonian Center for Astrophysics, and the Central Bureau for Astronomical Telegrams, operated by Harvard University.
Group:Infrared Processing and Analysis Center (IPAC), Palomar Transient Factory
Funding AgencyGrant Number
National Science Council (Taipei)MOST 104-2112-M-008-014-MY3MOST 104-2112-M-008-014-MY3
National Science Council (Taipei)MOST 104-2119-M-008-024
Macau Science and Technology Fund017/2014/A1
Subject Keywords:minor planets, asteroids: general; surveys
Issue or Number:2
Record Number:CaltechAUTHORS:20161207-120923097
Persistent URL:
Official Citation:Chan-Kao Chang et al 2016 ApJS 227 20
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:72631
Deposited By: Ruth Sustaita
Deposited On:07 Dec 2016 22:50
Last Modified:09 Mar 2020 13:19

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