Study on the asteroidal spin characteristics in the Hungaria region

Abstract

Hungaria region locates the inner edge of asteroidal main belt with the high orbital inclination and is surrounded by several resonances, in which more small asteroids (size less than 11 km) reside. We estimate the spin states for eight fast (rotation period ) rotators in this region based on the dense photometric data and discover that seven of them are in the retrograde spin state. By the analysis on the distributions of spin characteristics, 35 out of 59 Hungaria region members exhibit a tendency—their obliquities distribute in the range larger than , and especially, most of them clustering significantly in the interval of . Meanwhile, it is also noted that the Hungaria region asteroids with the fast spin (rotation period ) show more significant clustering characteristic.

Multi‐color photometric observations of three asteroids in the vicinity of Vesta family

“…At the beginning of the inversion process, a necessary step is to determine asteroidal rotation period. We continue a similar strategy described by Wang & Xu (2021), to obtain the underlying tentative period(s). Figure A1 displays the tentative period distributions for these three asteroids.…”