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Hera and its Asteroid Target

By Doug Messier
Parabolic Arc
June 25, 2020
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ESA’s Hera mission for planetary defence seen approaching the Dimorphos asteroid moonlet. (Credit: OHB)

PARIS (ESA PR) — ESA’s Hera mission for planetary defence seen approaching the Dimorphos asteroid moonlet, which is destined to become the subject of an audacious deflection experiment.

The newly-named Dimorphos – at 160 m across, about the size of Egypt’s Great Pyramid – orbits around the main 780 m mountain-sized Didymos near-Earth asteroid. Next year NASA’s Double Asteroid Redirection Test (DART) will leave Earth and in October 2022 will perform a kinetic impact with Dimorphos, in an attempt to deflect its orbit.

Then in 2024 ESA’s Hera spacecraft will set off to perform a close-up investigation of the result: the sole object in the Solar System to have had its orbit shifted by humankind in a measurable way.

By gathering details of Dimorphos’s mass, composition and the crater left by DART, Hera – along with the two CubeSats it will carry with up, for close-up views – will let researchers assess the effectiveness of the deflection technique in as full a manner as possible, enabling its reuse if needed against an oncoming asteroid.

Hera will also return plentiful bonus science, with its Juventas CubeSat performing the first radar survey of an asteroid’s interior, demonstrate inter-satellite link technology in deep space and provide experience of ultra-low gravity operations.

Given the go ahead at ESA’s Space19+ Ministerial Council last November, Hera is set to undergo its preliminary design review in the autumn.

This month, ESA is celebrating the UN-recognised Asteroid Day, to inspire the world about asteroids and their role in the formation of our solar system, how we can use their resources, how asteroids can pave the way for future exploration and how we can protect our planet from asteroid impacts. More information, and a month of programming, via