The Hungaria population: A comparison between sub-groups

CAÑADA-ASSANDRI, M., GIL-HUTTON, R. Y RIVEIRO, A. O.

PLANETARY AND SPACE SCIENCE

PERGAMON-ELSEVIER SCIENCE LTD

Lugar: Amsterdam; Año: 2015 vol. 105 p. 60 - 64

0032-0633

To investigate if the two sub-groups in proper inclination found in the Hungaria region by Milani et al.(2010) could be characterized by physical parameters of the objects, we analyze two surfaces propertiesof the asteroids in the zone: the taxonomical distribution, obtained from the SDSS-MOC4, and the albedodistribution, taken from the WISE data. Our analysis suggests that both sub-groups are different.The asteroids with sin ip o 0:4 exhibit a majority of X-types objects and an excess of high albedo objects.In contrast, the objects with sin ip 4 0:4 show a taxonomical distribution dominated by S-types asteroidsand an albedo distribution without high albedo excess. Based on these results we propose that the sub-group in high proper inclination and dominated by S-types could be the primordial population while thehigh albedo excess observed in the other sub-group could be the consequence of a contamination in thisregion with a medium-belt object(s) that filled the Hungaria region with fresh X-types after suffering a catastrophic collision.