Spin Parameters and Shape Models of Near-Earth Asteroids (4660) Nereus, (21088) Chelyabinsk, (66146) 1998 TU3, and (297418) 2000 SP43

Abstract

We present our shape and rotational characterization of four near-Earth asteroids observed as part of the Visible NEAs Observations Survey. This work includes 61 new light curves obtained between 2020 June and 2024 September for asteroids (21088) Chelyabinsk and (66146) 1998 TU3 and the potentially hazardous asteroids (4660) Nereus and (297418) 2000 SP43. We combine these observations with archival data to derive their shape models, spin parameters, and refined rotation periods using a light-curve inversion method. Our derived rotational periods are consistent with previously published values for all the objects. We present constant-period models for each asteroid, while for (66146) 1998 TU3 we detect a possible Yarkovsky-O'Keefe-Radzievskii-Paddack (YORP) acceleration of $\upsilon \simeq 2.05\times 10^{-8}{\text{ rad day}}^{-2}$, potentially adding it to the short list of asteroids known to experience the YORP effect.

References in corpus (9)

• astroquery: An Astronomical Web-Querying Package in Python
• PHOTOMETRYPIPELINE: An Automated Pipeline for Calibrated Photometry
• Asteroids' physical models from combined dense and sparse photometry and scaling of the YORP effect by the observed obliquity distribution
• NEOWISE Reactivation Mission Year Two: Asteroid Diameters and Albedos
• Scientific CMOS sensors in Astronomy: IMX455 and IMX411
• YORP and Yarkovsky effects in asteroids (1685) Toro, (2100) Ra-Shalom, (3103) Eger, and (161989) Cacus
• Observations of two super fast rotator NEAs: 2021 NY${}_1$ and 2022 AB
• Improved models for near-Earth asteroids (2100) Ra-Shalom, (3103) Eger, (12711) Tukmit & (161989) Cacus
• Light-curve analysis and shape models of NEAs 7335, 7822, 154244 and 159402