This dome-like feature is similar in the morphology and formation process to the circular region we’ve seen in another HiRISE image (ESP_013249_1805). In this case, it doesn’t appear to involve an impact crater. Orcus Patera is a region first photographed by Mariner 4 in 1965.

ID: ESP_042641_1900
date: 1 September 2015
altitude: 278 km

https://uahirise.org/hipod/ESP_042641_1900
NASA/JPL-Caltech/University of Arizona
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