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We present a physical model and spin-state analysis of the potentiallyhazardous asteroid (23187) 2000 PN9. As part of a long-term campaign to makedirect detections of the YORP effect, we collected optical lightcurves of theasteroid between 2006 and 2020. These observations were combined with planetaryradar data to develop a detailed shape model which was used to search for YORPacceleration. We report that 2000 PN9 is a relatively large top-shaped bodywith a sidereal rotation period of 2.53216$\pm$0.00015 h. Although we find noevidence for rotational acceleration, YORP torques smaller than$\sim$10$^{-8}$$\,\rm rad/day^{2}$ cannot be ruled out. It is likely that 2000PN9 is a YORP-evolved object, and may be an example of YORP equilibrium or selflimitation.

Physical modelling of near-Earth asteroid (23187) 2000 PN9 with ground-based optical and radar observations