Complex Relationships in the Occator-Kirnis Region

This view obtained by NASA's Dawn spacecraft during its Survey orbit illustrates the diversity and complexity of Ceres' geology. It shows familiar features: Occator Crater with its bright deposits (called faculae) of carbonates and other salts, a series of linear features (at right) called Samhain Catenae, and another large crater on the right side of the image called Kirnis. A relatively fresh crater called Lociyo, superimposed on an older crater, can be seen toward the bottom left of the picture. Studying the morphologies and relationships between various types of geological features can help scientists reconstruct Ceres' history. Occator appears to be one of the youngest features in this picture, except for a couple of smaller craters. The 71-mile-wide (115-kilometer-wide) Kirnis Crater on the other hand is an old, eroded crater. It owes its peculiar polygonal shape in part to its overlap with one of the Samhain Catenae. This illustrates the role of fractures in driving the geometry of some of Ceres' craters. The origin of these particular catenae is not understood yet, and is not necessarily related to the Pongal Catena. Kirnis Crater is named after a Lithuanian spirit-guardian of cherry trees, whereas the Samhain Catenae refer to a Gaelic festival organized at the end of the harvest season. It was observed in Ireland and Scotland during seven days in October and November, nearly halfway between the autumn equinox and the winter solstice. This picture was obtained on June 25, 2015, from an altitude of 2,700 miles (4,400 kilometers). It is centered at 1.7 degrees north latitude, and 249 degrees east longitude. https://photojournal.jpl.nasa.gov/catalog/PIA21409