An asteroid with dimensions equivalent to a cruise ship will make one of the largest predicted encounters between Earth and an asteroid by science, scheduled for April 13, 2029. This event will occur in a region near the planet but does not pose a collision danger.
Details of the Approach
With an estimated diameter of about 375 meters, the asteroid Apophis will pass at a distance of approximately 32 thousand kilometers from the Earth's surface, a proximity smaller than the orbit of many geostationary satellites. It is estimated that about 90% of the world's population may witness this phenomenon in the sky, depending on atmospheric conditions.
Global Observation and Route
Projections regarding Apophis's passage were detailed during the workshop 'Apophis T-3 Years: Knowledge Opportunities for the Science of Planetary Defense,' held in June at the University of Padua, Italy. Researchers presented maps indicating the global areas where the object's trajectory can be seen. The apparent route of the asteroid should be observed for about seven hours, starting in Australia and Asia, reaching maximum brightness over Africa, and ending over the North Atlantic.
North America will be the only region where climatic conditions will not be favorable for observation. For those in appropriate locations, Apophis will not appear as a fast meteor, but rather as a luminous point moving slowly among the stars.
Scientific Significance of the Event
Despite the notable proximity, NASA confirmed that there is no risk of impact during the 2029 approach or in the next hundred years. The great scientific interest lies precisely in the short distance between the asteroid and Earth, since a body of this size typically makes such a close pass only every five to ten thousand years, constituting a rare opportunity for the current generation.
Richard Binzel, an astronomer at the Massachusetts Institute of Technology (MIT), emphasized the historical value of the observation, stating that 'This is the first time we have been able to predict, in human history, the visible passage of an asteroid by Earth.' For him, following the movement of Apophis is a collective experience of spatial contemplation and an opportunity to understand Earth's position in the universe.
Future Study Missions
The approach will also serve to expand knowledge about these celestial bodies. The European Space Agency is preparing the Ramses mission, which will approach the asteroid before the passage and monitor it during the close flyby. The purpose of this mission is to investigate possible modifications caused by Earth's gravity on the asteroid, covering changes in its shape, rotation, surface, and internal structure.
Additionally, NASA has reassigned the OSIRIS-APEX spacecraft, formerly known as OSIRIS-REx, to study Apophis after the approach. This probe had been responsible for collecting samples from the asteroid Bennu before taking on the new task. According to ESA, gravitational influence can cause transformations, such as the displacement of surface materials and the exposure of elements preserved since the formation of the Solar System, more than four billion years ago.
Patrick Michel, research director at the CNRS in the Observatoire de la Côte d’Azur, highlighted the scientific uniqueness of the moment in an ESA statement, affirming: 'For the first time, nature is bringing one of them to us and conducting the experiment on its own. All we need to do is observe.' The findings from these missions may support future planetary defense studies, providing data on asteroid composition, structure, and behavior to aid international strategies against objects on collision courses.