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With recent advancements in observing supermassive black holes with the EventHorizon Telescope, there has been persistent exploration into what the imagescan reveal about fundamental physics, including space-time geometries andastrophysical emission sources. Inspired by Penrose's aberration formula for arigid sphere, which clarified that increased speed does not flatten theappearance of the sphere, we extend the studies to the behavior of the imagesof accretion emissions. This paper examines the impact of aberration effects onthe images of a thin accretion disk around Kerr-de Sitter black holes forfinite distant observers, specifically focusing on the primary, secondary, and$n=2$ images. We employ the analytical ray-tracing scenario and extend theastrometric approach to investigate the images in the presence of aberration.This study is non-trivial because we do not assume a specific form of theaberration formula, instead, all aberration effects emerge from acoordinate-independent and tetrad-independent framework referred to as theastrometric approach. Our study finds that the shapes of the lower-order imagesget highly distorted for finite observers in motion, and the shapes and sizesof primary images are more sensitive to aberration than those of the $n=2$images. This finding suggests that the primary images could theoretically bedistinguished from the shadow based on their distinctive variations.

Aberration effect on lower-order images of thin accretion disk in the astrometric approach