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A comparative study of size frequency distributions of Jupiter Trojans, Hildas and main belt asteroids: A clue to planet migration history

Terai, Tsuyoshi; Takato, Naruhisa; Ohtsuki, Keiji +4 more

Since 2002, we have obtained size frequency distributions (SFDs) of main belt asteroids (MBAs), Hildas, and Jupiter Trojans (JTs) by using the 8.2-m Subaru Telescope equipped with the wide-field CCD cameras: Suprime-Cam (SC) or Hyper Suprime-Cam (HSC). After combining these SFDs with SFDs obtained from other surveys, we performed a comparative stu…

On the age of the Beagle secondary asteroid family

Carruba, V.

The Beagle family is a C-type subgroup of the Themis family, in the outer main belt. Previous works suggested that it could be younger than 20 Myr and a possible source for the dust in the i ≃1.4^∘ α zodiacal dust band. Here we took advantage of a much larger database for Beagle family members to revisit previous age estimates of this gr…

The influence of Ceres on the dynamical evolution of the Zdenekhorsky/Nemesis asteroid family

Carruba, V.; Barletta, W.

The Nemesis family, also identified as the Zdenekhorsky family by some authors, is an "incomplete" asteroid family in the central main belt, characterized by an asymmetric distribution between its left and right side, with most of its members located in the left part of the family. It has been suggested that this asymmetry, as well as the shape of…

2012 TC4 - An unusual fast-rotating PHA with C-type taxonomy

Ip, Wing-Huen; Lin, Zhong-Yi; Ngeow, Chow-Choong

The potentially hazardous asteroid 2012 TC4 made an Earth close approach at a distance of 0.11 lunar distance on 12 October 2017. Photometric observations were carried out between October 11 and October 12 at the Lulin Observatory at short cadence. Data analysis of the light curves shows that this PHA has a fast rotation period of 12.25 min, a lig…