ISSN 2330-717X

New Project Aims To Improve Planetary Defense Against Asteroids

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The University of Alicante (UA) is once again participating in a project on advanced research on near-Earth objects and new technologies for planetary defense that will run up to 2023. The project, called NEO-MAPP (acronym that stands for Near Earth Object Modelling and Payloads for Protection), is made up of 15 European institutions and funded by the European Commission with €4 million in the 2019 H2020 call for proposals.

According to Adriano Campo Bagatin, a researcher at the UA’s Department of Physics, Systems Engineering and Signal Theory, the scientific community has become aware of the need to measure the current technological capacity to avoid asteroid collisions with the Earth and to search for protective devices against this potential risk in recent decades. In this sense, the goal of NEO-MAPP is to make significant progress in our understanding of how an asteroid responds when it is hit by a spacecraft launched at high speed, which would be a kinetic impact, and also how an asteroid responds to a close flyby of a planet.

The goal is also to determine what instrumentation is needed on board a spacecraft to be able to fully determine all the physical, morphological and geological features of an asteroid subject to a provoked kinetic impact, as UA head of NEO-MAPP reported.

As a reference asteroid for most of the studies, the expert said they use the binary system Didymos (twins, in Greek), formed by a primary asteroid of the same name, about 800 metres in size, and its satellite (Dimorphos), of barely 160 metres. In terms of research into how an asteroid responds to a close flyby of a planet, Apophis will be used, which will come within just 31,600 kilometres of the Earth’s surface on 13 April 2029, i.e. beyond the orbit of geostationary satellites.

On that date, they will try to find out whether and how Apophis – which is about 300 metres in size and is not expected to collide with the Earth for at least a century, according to the latest observations – will be deformed by its close passage through the atmosphere.

DART and HERA missions

The context in which NEO-MAPP is being developed is closely related to two previously announced space missions: DART, from NASA, and Hera, from the European Space Agency (ESA), which, although separate, are part of the AIDA (Asteroid Impact & Deflection Assessment) project to deflect asteroids that may collide with the Earth. Both missions are targeting the Didymos binary system at its closest approach to Earth in 2022.

The DART spacecraft, weighing more than 600 kilos, will be launched between November this year and February 2022 to crash into the surface of the smaller of the two asteroids (Dimorphos) at a speed of 6.5 kilometres per second at the end of September next year, with the aim of causing a crater and slightly modifying its orbit around the primary.

Four years later, in 2026, the European probe Hera is scheduled to arrive in the binary system to fully study the effects of the DART collision.

Bagatin’s field group within NEO-MAPP is involved in this phase, as one of its main goals will be to unravel the internal structure of Dimorphos and, if possible, of the primary asteroid. In addition, another related task will be how these binary objects have been formed, as this is currently unknown.

In astronomical terms, 15% of all objects close to the Earth’s orbit are binary asteroid systems, as University of Alicante expert Campo Bagatin explained. He says that knowing their internal composition could be key to finding out how an object of these features could be deflected in the event of a risk of collision with the Earth.

The only technologically feasible way to test whether an asteroid can be deflected from its orbit at the moment is to carry out a kinetic impact, and the DART and Hera missions are intended to test whether this procedure is really effective. This will be seen in the current decade with a successful outcome, and therefore, the beginning of planetary defence could cease to be science fiction.

The NEO-MAPP team at the UA includes, other than Adriano Campo Bagatin, UA researchers Paula Benavidez Lozano and Manuel Pérez Molina, postdoctoral researcher Laura Martínez Parro, and PhD students Po-Yen Liu from Taiwan and Nair Trógolo from Argentina.

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