We have 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 that are regarded as 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, and implies that the collision event that formed V-type asteroids is sub-billion to several billion years in age.
@article{arxiv.1311.4653,
title = {Lightcurve Survey of V-type Asteroids in the Inner Asteroid Belt},
author = {Sunao Hasegawa and Seidai Miyasaka and Hiroyuki Mito and Yuki Sarugaku and Tomohiko Ozawa and Daisuke Kuroda and Setsuko Nishihara and Akari Harada and Michitoshi Yoshida and Kenshi Yanagisawa and Yasuhiro Shimizu and Shogo Nagayama and Hiroyuki Toda and Kouji Okita and Nobuyuki Kawai and Machiko Mori and Tomohiko Sekiguchi and Masateru Ishiguro and Takumi Abe and Masanao Abe},
journal= {arXiv preprint arXiv:1311.4653},
year = {2015}
}
Comments
16 pages, 25 figures, and 2 tables, accepted for publication in PASJ