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Lightcurve survey of V-type asteroids in the inner asteroid belt

2014; Oxford University Press; Volume: 66; Issue: 3 Linguagem: Inglês

10.1093/pasj/psu040

2053-051X

Sunao Hasegawa, Seidai Miyasaka, Hiroyuki Mito, Yuki Sarugaku, Tomohiko Ozawa, D. Kuroda, S. Nishihara, Akari Harada, M. Yoshida, K. Yanagisawa, Yasuhiro Shimizu, S. Nagayama, Hiroyuki Toda, Kichi Okita, N. Kawai, Machiko Mori, Tomohiko Sekiguchi, Masateru Ishiguro, Takumi Abe, Masanao Abe,

High-pressure geophysics and materials

Abstract We observed the lightcurves of 13 V-type asteroids [(1933) Tinchen, (2011) Veteraniya, (2508) Alupka, (3657) Ermolova, (3900) Knezevic, (4005) Dyagilev, (4383) Suruga, (4434) Nikulin, (4796) Lewis, (6331) 1992 FZ1, (8645) 1998 TN, (10285) Renemichelsen, and (10320) Reiland]. Using these observations we determined the rotational rates of the asteroids, with the exception of Nikulin and Renemichelsen. The distribution of rotational rates of 59 V-type asteroids in the inner main belt, including 29 members of the Vesta family, which are regarded as being ejecta from the asteroid (4) Vesta, is inconsistent with the best-fit Maxwellian distribution. This inconsistency may be due to the effect of thermal radiation Yarkovsky–O’Keefe–Radzievskii–Paddack (YORP) torques, which implies that the collision event that formed V-type asteroids is sub-billion to several billion years in age.