Please use this identifier to cite or link to this item: https://research.matf.bg.ac.rs/handle/123456789/1199
Title: A Dark Asteroid Family in the Phocaea Region
Authors: Novaković, Bojan 
Tsirvoulis, Georgios
Granvik, Mikael
Todović, Ana
Affiliations: Astronomy 
Keywords: celestial mechanics;minor planets, asteroids: general
Issue Date: 1-Jun-2017
Journal: Astronomical Journal
Abstract: 
We report the discovery of a new asteroid family among the dark asteroids residing in the Phocaea region the Tamara family. We make use of available physical data to separate asteroids in the region according to their surface reflectance properties, and establish the membership of the family. We determine the slope of the cumulative magnitude distribution of the family, and find it to be significantly steeper than the corresponding slope of all the asteroids in the Phocaea region. This implies that subkilometer dark Phocaeas are comparable in number to bright S-type objects, shedding light on an entirely new aspect of the composition of small Phocaea asteroids. We then use the Yarkovsky V-shape based method and estimate the age of the family to be 264 ± 43 Myr. Finally, we carry out numerical simulations of the dynamical evolution of the Tamara family. The results suggest that up to 50 Tamara members with absolute magnitude may currently be found in the near-Earth region. Despite their relatively small number in the near-Earth space, the rate of Earth impacts by small, dark Phocaeas is non-negligible.
URI: https://research.matf.bg.ac.rs/handle/123456789/1199
ISSN: 00046256
DOI: 10.3847/1538-3881/aa6ea8
Appears in Collections:Research outputs

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