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FOSSIL. I. 목성 트로이군의 자전속도 한계
  • 2021-09-14
  • THE PLANETARY SCIENCE JOURNAL 2 5 : 191-1~191-11
Rotation periods of 53 small (diameters 2 km < D < 40 km) Jupiter Trojans (JTs) were derived using the high-cadence lightcurves obtained by the FOSSIL phase I survey, a Subaru/Hyper Suprime-Cam intensive program. These are the first reported periods measured for JTs with D < 10 km. We found a lower limit of the rotation period near 4 hr, instead of the previously published result of 5 hr found for larger JTs. Assuming a rubble-pile structure for JTs, a bulk density of ?0.9 g cm?3 is required to withstand this spin rate limit, consistent with the value ∼0.8?1.0 g cm?3 derived from the binary JT system, (617) Patroclus?Menoetius system.