Antapex -

Differential impact cratering of Saturn's satellites (Wiley) [1]

Synchronously rotating moons (like Rhea and Iapetus) often exhibit an apex-antapex asymmetry [1]. The leading hemisphere (apex) generally shows a higher density of large impact craters than the trailing hemisphere (antapex) because it "sweeps up" debris in its path [7]. antapex

The Distribution of Earth-Impacting Interstellar Objects (arXiv) [2] The Solar Apex (Nature) [10] Lunar Cold Spots and Crater Production (AGU) [7] antapex