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A Quick Test on Rotation Period Clustering for the Small Members of the Koronis Family
Chan-Kao Chang, Hsing-Wen Lin, Wing-Huen Ip
Rotation period clustering in prograde/retrograde rotators might indicate the preliminary indication of the Slivan state in the Koronis family as a result of the YORP effect. We fo…
Boulders on asteroid Toutatis as observed by Chang'e-2
Yun Jiang, Jianghui Ji, Jiangchuan Huang +3
Boulders are ubiquitously found on the surfaces of small rocky bodies in the inner solar system and their spatial and size distributions give insight into the geological evolution…
Asteroid Spin-Rate Study using the Intermediate Palomar Transient Factory
Chan-Kao Chang, Wing-Huen Ip, Hsing-Wen Lin +10
Two dedicated asteroid rotation-period surveys have been carried out using data taken on January 6-9 and February 20-23 of 2014 by the Intermediate Palomar Transient Factory (iPTF)…
Asteroid lightcurves from the Palomar Transient Factory survey: Rotation periods and phase functions from sparse photometry
Adam Waszczak, Chan-Kao Chang, Eran O. Ofek +10
We fit 54,296 sparsely-sampled asteroid lightcurves in the Palomar Transient Factory to a combined rotation plus phase-function model. Each lightcurve consists of 20+ observations…
Orientation and Rotational Parameters of Asteroid 4179 Toutatis: New Insights from Chang'e-2's Close Flyby
Yuhui Zhao, Jianghui Ji, Jiangchuan Huang +4
In this work, we investigate the rotational dynamics of the ginger-shaped near-Earth asteroid 4179 Toutatis, which was closely observed by Chang'e-2 at a distance of m…
VI-Band Follow-Up Observations of Ultra-Long-Period Cepheid Candidates in M31
Chow-Choong Ngeow, Chien-Hsiu Lee, Michael Ting-Chang Yang +7
The ultra-long period Cepheids (ULPCs) are classical Cepheids with pulsation periods exceeding days. The intrinsic brightness of ULPCs are ~1 to ~3 mag brighter than t…