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NASA is extending Dawn’s mission over Ceres for a second time

In June 2016, the Daybreak spacecraft reached the end of its primary mission over Ceres. Since then, the spacecraft has remained in orbit around the dwarf planet, the place it has continued to observe and examine its floor. This week, NASA has announced a second mission extension for the probe, one that may take its closest look but on the photo voltaic system’s largest dwarf planet.

When Daybreak arrived in orbit around Ceres in 2015, it supplied scientists with an unprecedented have a look at on the asteroid belt’s largest object, revealing new features (which change into made of salt), an active surface, and even organic compounds. There was nonetheless gas left over as soon as it accomplished that mission, and whereas scientists thought of sending the spacecraft to another, undisclosed asteroid, they opted to stay in a excessive orbit to proceed learning the article.

For this new mission extension, Daybreak’s flight staff is trying into methods to deliver the probe into a brand new orbit round Ceres, one that would take it to lower than 120 miles above its floor. Beforehand, Daybreak’s lowest orbit introduced it to inside 240 miles above the dwarf planet. In keeping with NASA, the extension’s main focus will likely be to make use of the spacecraft’s gamma ray and neutron spectrometers to review the higher layer of Ceres’ crust to see how a lot ice it comprises.

The mission extension signifies that Daybreak will likely be lively round Ceres in April 2018 when the dwarf planet is at its closest level to the Solar. Scientists hope that it will present if that nearer distance is sufficient to soften ice on its floor, and in that case, if it helps type the thin, transient atmosphere. Scientists may also use Daybreak’s seen and infrared mapping spectrometer to review Ceres’ mineral composition, and can proceed to take visual-light photos of its floor.

Mission planners imagine that the probe will be capable of function till late 2018. In contrast to the Cassini spacecraft, which burned up in Saturn’s atmosphere in September, Daybreak will stay in orbit round Ceres, to keep away from contaminating its surface.

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