Dawn spacecraft captures new images of Ceres' Occator Crater

Jason Rhian

July 4th, 2018

The northern wall of Occator Crater on Ceres. The Dawn spacecraft imaged this feature on June 16, 2018, as the probe orbited the tiny dwarf planet from an altitude of just 21 miles (33 kilometers). Image Credit: NASA / JPL-Caltech / UCLA / MPS / DLR / IDA

NASA’s Dawn spacecraft has entered into its final planned orbital position from which it will study the dwarf planet Ceres, the lowest the probe has descended to the tiny world since it arrived in orbit on March 6, 2015.

The probe is powered by three xenon ion thrusters and it enter into its new orbit around the dwarf planet on June 6, 2018. Since then, the spacecraft has begun beaming back to Earth stunning new and closer images of this tiny worldlet.

This mosaic of a prominent mound located on the western side of Cerealia Facula was obtained by NASA’s Dawn spacecraft on June 22, 2018, from an altitude of about 21 miles (34 kilometers). Image & Caption Credit: NASA / JPL

One of Dawn’s targets is Occator Crater. While the name might not ring a bell even among space enthusiasts, the “bright spots” contained within the crater should. These deposits are thought to be salt from briny water that erupted from the dwarf planet’s surface before sublimating. It was found that the bright regions were comprised of sodium carbonate. On Earth, these salts are left behind when water evaporates.

Dawn was instructed to fire its ion engine—for what could be the last time—last week. By carrying out this maneuver, the probe flew closer to the dwarf planet’s Cerealia Facula. This is the region of Occator Crater that contains a large deposit of sodium carbonate.

“Acquiring these spectacular pictures has been one of the greatest challenges in Dawn’s extraordinary extraterrestrial expedition, and the results are better than we had ever hoped,” said Marc Rayman, Dawn’s chief engineer and project manager at NASA’s Jet Propulsion Laboratory, said in news release. “Dawn is like a master artist, adding rich details to the otherworldly beauty in its intimate portrait of Ceres.”

Dawn was directed into its last orbit, where it will arc over the tiny planetoid again and again, peering down from an estimated 22 miles (35 kilometers) above the dwarf planet’s surface.

“The first views of Ceres obtained by Dawn beckoned us with a single, blinding bright spot,” said Carol Raymond of JPL, Dawn’s principal investigator. “Unraveling the nature and history of this fascinating dwarf planet during the course of Dawn’s extended stay at Ceres has been thrilling, and it is especially fitting that Dawn’s last act will provide rich new data sets to test those theories.”

It is hoped that the spacecraft’s closer position will bring its features into sharper focus. According to NASA, researchers will employ the spacecraft’s visible and infrared mapping spectrometer as well as other instruments (which include a gamma ray and neutron detector as well as a visible and infrared mapping spectrometer) to study the dwarf planet’s features in greater detail.

Before its recent descent, the closest Dawn had traveled to Ceres was 240 miles (385 kilometers). Now more than 200 miles closer in, the differences between the bright and dark regions in the Vinalia Faculae region of the dwarf planet are expected to be more obvious.

Dawn was constructed by Orbital Sciences and is operated by JPL, which is located in Pasadena, California. More of the vehicle’s images can be seen here. Rayman is providing updates about the spacecraft’s discoveries in orbit above the dwarf planet, which can be viewed here: Dawn Journal.

Tagged: Ceres Dawn NASA Occator Crater The Range

Jason Rhian

Jason Rhian spent several years honing his skills with internships at NASA, the National Space Society and other organizations. He has provided content for outlets such as: Aviation Week & Space Technology, Space.com, The Mars Society and Universe Today.

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