The European Space Agency (ESA) is Europe’s gateway to space. Its mission is to shape the development of Europe’s space capability and ensure that investment in space continues to deliver benefits to the citizens of Europe and the world.
Find out more about space activities in our 23 Member States, and understand how ESA works together with their national agencies, institutions and organisations.
Exploring our Solar System and unlocking the secrets of the Universe
Go to topicProtecting life and infrastructure on Earth and in orbit
Go to topicUsing space to benefit citizens and meet future challenges on Earth
Go to topicMaking space accessible and developing the technologies for the future
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The tracing of asteroid surface features is the technique ESA's Hera mission will use to navigate around the Didymos system. The mass of Didymoon will also be measured by observing the so-called ‘wobble’ of its parent ‘Didymain’ asteroid. Hera will achieve this by selecting a key landmarks, such as boulders, on the larger asteroid surface then tracking their motion around the centre of mass of the overall asteroid system.