A Dark Asteroid Family in the Phocaea Region

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http://hdl.handle.net/10138/195068

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Novakovic , B , Tsirvoulis , G , Granvik , M & Todovic , A 2017 , ' A Dark Asteroid Family in the Phocaea Region ' Astronomical Journal , vol. 153 , no. 6 , 266 . DOI: 10.3847/1538-3881/aa6ea8

Title: A Dark Asteroid Family in the Phocaea Region
Author: Novakovic, Bojan; Tsirvoulis, Georgios; Granvik, Mikael; Todovic, Ana
Contributor: University of Helsinki, Particle Physics and Astrophysics
Date: 2017-06
Number of pages: 8
Belongs to series: Astronomical Journal
ISSN: 0004-6256
URI: http://hdl.handle.net/10138/195068
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 +/- 43Myr. 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 H <19.4 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.
Subject: celestial mechanics
minor planets, asteroids: general
MAIN BELT ASTEROIDS
SKY SURVEY
IDENTIFICATION
SIZE
CLASSIFICATION
EVOLUTION
DENSITY
OBJECTS
AGES
115 Astronomy, Space science
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