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arXiv · 1311.4653

Lightcurve Survey of V-type Asteroids in the Inner Asteroid Belt

Sunao Hasegawa·Seidai Miyasaka·Hiroyuki Mito·Yuki Sarugaku·Tomohiko Ozawa·Daisuke Kuroda·Setsuko Nishihara·Akari Harada·Michitoshi Yoshida·Kenshi Yanagisawa·Yasuhiro Shimizu·Shogo Nagayama·Hiroyuki Toda·Kouji Okita·Nobuyuki Kawai·Machiko Mori·Tomohiko Sekiguchi·Masateru Ishiguro·Takumi Abe·Masanao Abe
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Abstract

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 $\mathrm{FZ_{1}}$, (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.

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Sunao Hasegawa, Seidai Miyasaka, Hiroyuki Mito, Yuki Sarugaku, Tomohiko Ozawa, Daisuke Kuroda, Setsuko Nishihara, Akari Harada, Michitoshi Yoshida, Kenshi Yanagisawa, Yasuhiro Shimizu, Shogo Nagayama, Hiroyuki Toda, Kouji Okita, Nobuyuki Kawai, Machiko Mori, Tomohiko Sekiguchi, Masateru Ishiguro, Takumi Abe, Masanao Abe. 2013-11-19. Lightcurve Survey of V-type Asteroids in the Inner Asteroid Belt. https://doi.org/10.1093/pasj%2Fpsu040

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