HST/ACS image of DF9 shown below a DECaLS image of the NGC 1052 field. The kinematically connected trail of galaxies, including DF2 and DF4, is indicated in the blue boxes. The field of view for KCWI pointings is shown in red, and the two clusters with known radial velocities are circled in yellow. Both images are oriented along the trail axis (M. A. Keim et al. 2025).