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FOSSIL. II. The rotation periods of small-sized Hilda asteroids

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DOIResolve DOI: https://doi.org/10.3847/1538-4365/ac50ac
AuthorSearch for: ORCID identifier: https://orcid.org/0000-0003-1656-4540; Search for: ORCID identifier: https://orcid.org/0000-0001-7244-6069; Search for: 1ORCID identifier: https://orcid.org/0000-0001-6680-6558; Search for: ORCID identifier: https://orcid.org/0000-0003-4077-0985; Search for: ORCID identifier: https://orcid.org/0000-0001-6491-1901; Search for: ORCID identifier: https://orcid.org/0000-0003-4143-8589; Search for: ; Search for: ORCID identifier: https://orcid.org/0000-0001-8214-5147; Search for: ORCID identifier: https://orcid.org/0000-0002-0549-9002; Search for: ORCID identifier: https://orcid.org/0000-0003-3435-7596; Search for: ORCID identifier: https://orcid.org/0000-0002-9260-1537; Search for: ORCID identifier: https://orcid.org/0000-0001-7032-5255; Search for: ORCID identifier: https://orcid.org/0000-0002-4787-6769; Search for: ORCID identifier: https://orcid.org/0000-0001-5368-386X; Search for: ; Search for: ORCID identifier: https://orcid.org/0000-0003-3827-8991; Search for: ORCID identifier: https://orcid.org/0000-0003-0926-2448; Search for: ; Search for: ORCID identifier: https://orcid.org/0000-0002-2986-2371; Search for: ORCID identifier: https://orcid.org/0000-0002-0792-4332; Search for: ORCID identifier: https://orcid.org/0000-0002-4383-8247; Search for: ORCID identifier: https://orcid.org/0000-0003-4797-5262; Search for: ORCID identifier: https://orcid.org/0000-0003-4143-4246; Search for: ORCID identifier: https://orcid.org/0000-0001-7501-8983; Search for: ORCID identifier: https://orcid.org/0000-0002-3286-911X; Search for: ORCID identifier: https://orcid.org/0000-0001-6485-6877; Search for: ORCID identifier: https://orcid.org/0000-0001-9059-5623; Search for: ORCID identifier: https://orcid.org/0000-0003-1680-2940
Affiliation
  1. National Research Council of Canada. Herzberg Astronomy and Astrophysics
FunderSearch for: Ministry of Science and Technology, Taiwan
FormatText, Article
SubjectHilda group; period determination; asteroid rotation
Abstract
Using the high-cadence lightcurves collected from the FOSSIL survey, rotation periods of 17 small (diameter 1 km < D < 3 km) Hilda asteroids (hereinafter Hildas) were obtained. Combined with the previously measured rotation periods of Hildas, a spin-rate limit appears at around 3 hr. Assuming rubble-pile structures for the Hildas, a bulk density of ∼1.5 g cm⁻³ is required to withstand this spin-rate limit. This value is similar to that of the C-type asteroids (1.33 g cm⁻³) and higher than the ∼1 g cm⁻³ bulk density of the Jupiter Trojans. This suggests that the Hildas population may contain more C-type asteroids than expected, and the limit at 3 hr simply reflects the spin-rate limit for C-type asteroids. In addition, a Hilda superfast rotator was found, which has a rotation period of 1.633 hr and an estimated diameter of 0.7 km. This object is unlikely to be explained by a rubble-pile or monolithic structure.
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PublisherIOP
Copyright statement
  • © 2022. The Author(s). Published by the American Astronomical Society.
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In
  • The Astrophysical Journal Supplement Series 259, no. 1 (23 February 2022): 7–.
LanguageEnglish
Peer reviewedYes
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Record identifier9f4d0b01-c9e0-4110-8c09-483d37b11254
Record created2023-12-05
Record modified2023-12-05
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