Rotational properties of Hilda asteroids observed by the K2 mission. (arXiv:2001.06656v1 [astro-ph.EP])
<a href="http://arxiv.org/find/astro-ph/1/au:+Szabo_G/0/1/0/all/0/1">Gyula M. Szabó</a> (1,2), <a href="http://arxiv.org/find/astro-ph/1/au:+Kiss_C/0/1/0/all/0/1">Csaba Kiss</a> (3), <a href="http://arxiv.org/find/astro-ph/1/au:+Szakats_R/0/1/0/all/0/1">Róbert Szakáts</a> (3), <a href="http://arxiv.org/find/astro-ph/1/au:+Pal_A/0/1/0/all/0/1">András Pál</a> (3,4), <a href="http://arxiv.org/find/astro-ph/1/au:+Molnar_L/0/1/0/all/0/1">László Molnár</a> (3,5), <a href="http://arxiv.org/find/astro-ph/1/au:+Sarneczky_K/0/1/0/all/0/1">Krisztián Sárneczky</a> (3), <a href="http://arxiv.org/find/astro-ph/1/au:+Vinko_J/0/1/0/all/0/1">József Vinkó</a> (3), <a href="http://arxiv.org/find/astro-ph/1/au:+Szabo_R/0/1/0/all/0/1">Róbert Szabó</a> (3,5), <a href="http://arxiv.org/find/astro-ph/1/au:+Marton_G/0/1/0/all/0/1">Gábor Marton</a> (3), <a href="http://arxiv.org/find/astro-ph/1/au:+Kiss_L/0/1/0/all/0/1">László L. Kiss</a> (3,6) ((1) ELTE Eötvös Loránd University, Gothard Astrophysical Observatory, Szombathely, Hungary, (2) MTA-ELTE Exoplanet Research Group, Szombathely, Hungary, (3) Konkoly Observatory, Research Centre for Astronomy and Earth Sciences, Budapest, Hungary, (4) Eötvös Loránd University, Budapest, Hungary, (5) MTA CSFK Lendület Near-Field Cosmology Research Group, (6) Sydney Institute for Astronomy, School of Physics A29, University of Sydney, NSW, Australia)
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
that help in understanding the Hilda group in deeper details. 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 to 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,
Hilda group lacks the very fast rotators. The ratio of extremely slow rotators
(P>100 h) 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 high rate of binarity,
which we can estimate as 25% within the Hilda group.
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
that help in understanding the Hilda group in deeper details. 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 to 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,
Hilda group lacks the very fast rotators. The ratio of extremely slow rotators
(P>100 h) 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 high rate of binarity,
which we can estimate as 25% within the Hilda group.
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