ESA's Hera asteroid mission borrows eyes of NASA's Dawn

phys.org | 3/19/2019 | Staff
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The mission to the smallest asteroid ever explored will employ the same main camera as the mission to the largest asteroids of all. ESA's proposed Hera spacecraft to the Didymos asteroid pair has inherited its main imager from NASA's Dawn mission to the Vesta and Ceres asteroids.

Hera is currently the subject of detailed design work, ahead of being presented to Europe's space ministers at the Space19+ Ministerial Council at the end of this year, for launch in late 2023. The spacecraft will survey a tiny 160-m diameter moon of the 780-m diameter Didymos asteroid, in the aftermath of a pioneering planetary defence experiment.

Asteroid - Framing - Camera - AFC - Hera

But the Asteroid Framing Camera (AFC) Hera will use to navigate through space and survey its targeted double asteroids is already built and ready. Two of these cameras – Hera will carry a pair, for redundancy – are sitting in protective nitrogen gas inside a clean room in Göttingen, Germany.

"The AFC was designed specifically for NASA's Dawn mission to the two largest bodies in the Asteroid belt: Vesta, at 525 km across, and 946 km diameter Ceres," explains Holger Sierks of the Max Planck Institute for Solar System Research.

Camera - Spacecraft - AFC - Role - Navigation

"There was no other camera aboard the spacecraft so the AFC had a mission-critical role, being employed both for navigation and scientific investigation.

"The AFC worked like Swiss clockwork throughout Dawn's 11-year lifetime. Before Dawn finally ended in November 2018 the spacecraft came as close as 30 km from the surface of Ceres, and returned spectacular views of its striking bright spots.

Time - Camera - Filters - Information - Formations

"At the same time the camera, equipped with seven spectral filters from the visible to the near-infrared, was able to gather spectral information on these formations, as well as the rest of the asteroids. An eighth clear filter was used when the AFC was employed for navigation purposes and for...
(Excerpt) Read more at: phys.org
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