The distribution of Hyperion member galaxies, projected in the (left) R.A.-Dec., (middle) R.A.-z, and (right) Dec.-z planes. In each panel, the solid and dashed contours correspond to Hyperion’s outskirts and peaks, respectively, as defined by the VMC overdensity map. Additionally, the locations of the member galaxies are plotted prior to any Monte Carlo redshift sampling, and their marks are distinguished according to the redshift source: COSMOS2020 photometry (blue circles), ground-based spectroscopy (orange squares), or HST/grism spectroscopy (green triangles). For galaxies with both a ground-based spectroscopic redshift and a HST/grism redshift, the redshift with the highest quality according to the quality flags discussed in Section 2 is chosen. The histograms along each axis show the distribution of member galaxies in the corresponding projected dimension, color-coded by redshift source.