August 13, 2015 Page 7 New Names and Insights at Dwarf Planet Ceres The Dawn Spacecraft being assembled. Dawn was made to orbit the large asteroid Vesta and the dwarf planet Ceres, and was launched in 2007. It has since sent back enough data that scientists can map the surface of Ceres. Photo credit: NASA/JPL. agriculture deity of harrowing, a method of leveling soil. A smaller crater with bright material, previously labeled “Spot 1,” is now identified as Haulani, after the Hawaiian plant goddess. Haulani has a diameter of about 20 miles. Temperature data from Dawn’s visible and infrared mapping spectrometer show that this crater seems to be colder than most of the territory around it. Dantu crater, named after the Ghanaian god associated with the planting of corn, is about 75 miles across and 3 miles deep. A crater called Ezinu, after the Sumerian goddess of grain, is about the same size. Both are less than half the size of Kerwan, named after the Hopi spirit of sprouting maize, and Yalode, a crater named after the Looking Up Based on press release from NASA, provided by Bob Eklund Colorful new maps of Ceres, based on data from NASA’s Dawn spacecraft, showcase a diverse topography, with height differences between crater bottoms and mountain peaks as great as nine miles. Scientists continue to analyze the latest data from Dawn as the spacecraft makes its way to its third mapping orbit. “The craters we find on Ceres, in terms of their depth and diameter, are very similar to what we see on Dione and Tethys, two icy satellites of Saturn that are about the same size and density as Ceres. The features are pretty consistent with an ice-rich crust,” said Dawn science team member Paul Schenk, a geologist at the Lunar and Planetary Institute, Houston. Some of these craters and other features now have official names, inspired by spirits and deities relating to agriculture from a variety of cultures (since Ceres takes its name from the Roman goddess of agriculture). The International Astronomical Union recently approved a batch of names for features on Ceres. The newly labeled features include Occator, the mysterious crater containing Ceres’ brightest spots, which has a diameter of about 60 miles and a depth of about 2 miles. Occator is the name of the Roman African Dahomey goddess worshipped by women at harvest rites. “The impact craters Dantu and Ezinu are extremely deep, while the much larger impact basins Kerwan and Yalode exhibit much shallower depth, indicating increasing ice mobility with crater size and age,” said Ralf Jaumann, a Dawn science team member at the German Aerospace Center (DLR) in Berlin. Almost directly south of Occator is Urvara, a crater named for the Indian and Iranian deity of plants and fields. Urvara, about 100 miles wide and three miles deep, has a prominent central pointy peak that is two miles high. Dawn is currently spiraling toward its third science orbit, 900 miles above the surface, or three times closer to Ceres than its previous orbit. The spacecraft will reach this orbit in mid-August and begin taking images and other data again. Ceres, with a diameter of 584 miles, is the largest object in the main asteroid belt, located between Mars and Jupiter. This makes Ceres about 40 percent the size of Pluto, another dwarf planet, which NASA’s New Horizons mission flew by earlier this month. On March 6, 2015, Dawn made history as the first mission to reach a dwarf planet, and the first to orbit two distinct extraterrestrial targets. It conducted extensive observations of asteroid Vesta in 2011-2012. 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