Residuals of U1 positions by this work with respect to DE442+D7M25. The 300 s and 500 s exposed images are represented by gray and black circles. “C22,” “Z22,” “X19,” “Z24,” and “F25” are short for J. I. B. Camargo et al. (2022), H. Y. Zhang et al. (2022), H. J. Xie et al. (2019), H. Y. Zhang et al. (2024), and X. Q. Fang et al. (2025), respectively. Among them, only “C22,” “Z22,” and “X19” are used in the development of DE442 and URA182 (R. A. Jacobson & R. S. Park 2025), the others are newer. There are also other ephemerides plotted in the figure to show the difference from DE442+D7M25. Residuals along R.A. (Δα^∗) and decl. (Δδ) are shown in upper and lower panels, respectively. The “*” in Δα^∗ means multiplication by the cosine of the decl.