The asteroid Apophis has been the subject of great interest and concern since its discovery in 2004. Initially considered a potential threat to Earth, its trajectory has been closely monitored by astronomers worldwide. Its close approach in 2029 will be a unique astronomical event, generating both excitement and scientific studies aimed at better understanding these celestial bodies.
Although calculations have ruled out, at least for now, an impact with our planet, the incredible proximity at which it will pass gives us an unparalleled opportunity to study it. Below, we will explore in detail its characteristics, its trajectory, the risks that were once considered and the space missions that are scheduled to analyze it.
Characteristics of the asteroid Apophis
Apophis, officially designated 99942 Apophis , is an asteroid belonging to the Aten group, which includes asteroids whose orbits lie mostly within Earth's orbit. It is estimated to be around 335 meters in diameter , making it a relatively large object among near-Earth asteroids.
Its composition consists mainly of silicates , nickel, and iron, classifying it as a rocky asteroid . It was originally thought to be elongated, similar to a peanut, and its surface is believed to have been composed of loose rocks due to the low gravitational force.
As for its orbit, Apophis takes approximately 0,9 Earth years to complete one revolution around the Sun. However, its trajectory will be altered after its close approach to Earth in 2029, increasing its orbital period to 1,2 years.
The trajectory and its approach to Earth in 2029
The most significant astronomical event related to Apophis will occur on April 13, 2029 , when it makes its closest approach to Earth. At that time, it will pass within just 32.000 kilometers of Earth's surface, a distance closer than that of many geostationary satellites.
This close approach will allow the asteroid to be observed with the naked eye from various regions of the planet, especially in Europe, Africa, and Asia. Its brightness will be comparable to that of a 3,3 magnitude star, and it will travel across the night sky at a speed of 45.080 km/h . This event will be crucial for the study of the asteroid, just as the planetary safety alert was regarding other asteroids that could pose a danger to Earth.
Earth's gravity will significantly affect its orbit, altering its future trajectory. Although current calculations rule out an impact with Earth in the coming decades, astronomers are continuing to study how Earth's gravity could alter its course and whether this could pose any risk in the future.
Is there a risk of impact in 2036 or 2068?
Initially, calculations indicated a 2,7% probability of impact in 2029 , which raised concerns within the scientific community. However, more precise observations have completely ruled out this risk for that date.
Regarding 2036 and 2068, the chances of impact have been drastically reduced. In its latest assessment in 2021, NASA confirmed that Apophis poses no real threat to Earth in the next 100 years. This is a relief for the scientific community and citizens concerned about the planet's safety.
Space missions for the study of the asteroid
Apophis' unusual approach to Earth has prompted several space agencies to schedule missions to study it in detail. Among them, the following stand out:
- OSIRIS-APEX:This NASA spacecraft, formerly known as OSIRIS-REx, was rerouted after its mission to Bennu to approach Apophis. It is expected to orbit it for 18 months after its closest approach in 2029, providing valuable information on its structure and composition.
- RAMSES:The European Space Agency is considering launching the RAMSES mission in 2027, which would reach Apophis before its approach to Earth to analyze how its surface behaves under the Earth's gravitational influence.
The importance of studying Apophis
The study of Apophis will allow astronomers to better understand the physics of near-Earth asteroids, how they respond to planetary gravity , and what effects such an impact could have on our planet. This type of research is crucial in a context where we are constantly assessing Earth's safety against potential asteroid threats.
This type of research is vital for the development of planetary defense strategies , since if an asteroid on a collision course were identified in the future, having accurate data on how these celestial bodies work could help to deflect its trajectory.
Studying the size and orbit of asteroids like Bennu is crucial for understanding the potential risks associated with them. April 13, 2029, will be a key date for astronomy and a spectacle that millions of people will be able to observe with the naked eye. From that moment on, Apophis will continue to be studied, allowing humanity to learn a little more about the mysteries of the solar system.
