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

Dover, L., Lowry, S.C., Rożek, A., Rozitis, B., Jackson, S.L., Zegmott, T.J., Krugly, Yu.N., Belskaya, I.n., Fitzsimmons, A., Green, S.F., and others. (2023) Physical modelling of near-Earth asteroid (23187) 2000 PN9 with ground-based optical and radar observations. Monthly Notices of the Royal Astronomical Society, 525 (3). pp. 4581-4595. ISSN 0035-8711. E-ISSN 1365-2966. (doi:10.1093/mnras/stad2528) (KAR id:102688)


We present a physical model and spin-state analysis of the potentially hazardous asteroid (23187) 2000 PN9. As part of a long-term campaign to make direct detections of the YORP effect, we collected optical lightcurves of the asteroid between 2006 and 2020. These observations were combined with planetary radar data to develop a detailed shape model which was used to search for YORP acceleration. We report that 2000 PN9 is a relatively large top-shaped body with a sidereal rotation period of 2.53216 ± 0.00015 h. Although we find no evidence for rotational acceleration, YORP torques smaller than ∼10−8rad/day2 cannot be ruled out. It is likely that 2000 PN9 is a YORP-evolved object, and may be an example of YORP equilibrium or self limitation.

Item Type: Article
DOI/Identification number: 10.1093/mnras/stad2528
Additional information: For the purpose of open access, the author(s) has applied a Creative Commons Attribution (CC BY) licence to any Author Accepted Manuscript version arising
Uncontrolled keywords: minor planets, asteroids: individual: (23187) 2000 PN9, methods: observational, methods: data analysis, techniques: photometric, techniques: radar astronomy, radiation mechanisms: thermal
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Divisions: Divisions > Division of Natural Sciences > Physics and Astronomy
Funders: Science and Technology Facilities Council (
Depositing User: Lord Dover
Date Deposited: 05 Sep 2023 14:16 UTC
Last Modified: 27 Feb 2024 12:28 UTC
Resource URI: (The current URI for this page, for reference purposes)

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