Rotational Properties of Hilda Asteroids Observed by the K2 Mission

Gyula M. Szabó, Gyula M. Szabó, C. Kiss, C. Kiss, Róbert Szakáts, András Pál, András Pál, László Molnár, László Molnár, Krisztián Sárneczky, J. Vinkó, Róbert Szabó, Róbert Szabó, Gábor Marton, László L. Kiss, László L. Kiss

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Hilda asteroids orbit at the outer edge, or just outside of the Main Belt, occupying the 2:3 mean motion resonance with Jupiter. It is known that the group shows a mixed taxonomy that suggests the mixed origin of Hilda members, having migrated to the current orbit both from the outer Main Belt and from the Trojans swarms. But there are still few observations for comparative studies to help us understand the Hilda group in deeper detail. We identified 125 individual light curves of Hilda asteroids observed by the K2 mission. We found that despite of the mixed taxonomies, the Hilda group highly resembles the Trojans in the distribution of rotation periods and amplitudes, and even the LR group (mostly C- and X-type) Hildas follow this rule. Contrary to the Main Belt, the Hilda group lacks the very fast rotators. The ratio of extremely slow rotators (P > 100 hr) is a surprising 18%, which is unique in the solar system. The occurrence rate of asteroids with multiple periods (4%) and asteroids with three maxima in the light curves (5%) can be signs of a high rate of binarity, which we can estimate as 25% within the Hilda group.

Original languageEnglish
Article number34
JournalAstrophysical Journal, Supplement Series
Issue number1
Publication statusPublished - Mar 2020

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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    Szabó, G. M., Szabó, G. M., Kiss, C., Kiss, C., Szakáts, R., Pál, A., Pál, A., Molnár, L., Molnár, L., Sárneczky, K., Vinkó, J., Szabó, R., Szabó, R., Marton, G., Kiss, L. L., & Kiss, L. L. (2020). Rotational Properties of Hilda Asteroids Observed by the K2 Mission. Astrophysical Journal, Supplement Series, 247(1), [34].