Scientists have found evidence that a mysterious asteroid is gradually breaking apart due to the extreme heat from the Sun. Analysis of millions of data points collected by automated all-sky camera networks in Canada, Japan, California, and Europe led to the identification of a new group composed of 282 meteoroids. This group is linked to an unidentified asteroid disintegrating close to the Sun.
Small rocky particles entering Earth’s atmosphere from space heat up intensely due to friction, creating bright streaks commonly known as “shooting stars,” referred to scientifically as meteoroids. Most meteoroids originate from comets composed of ice and dust, whereas asteroids are generally dry and rocky. When an asteroid becomes active due to intense solar heat, high-speed orbit, or collisions, it begins releasing dust and rock fragments into space. As these fragments disperse, they form meteoroid streams, and when Earth passes through these streams, meteor showers occur.
A recent study published in The Astrophysical Journal notes that the trajectories of these 282 meteoroids are extreme, orbiting five times closer to the Sun than Earth’s own orbit. Scientists believe that the asteroid’s surface has developed fissures because of the severe solar heat, allowing gases inside to escape. Consequently, the entire celestial body is slowly disintegrating into dust particles. This active behavior has led to the asteroid being called a “rock-comet.” Previously, such activity was only observed on the well-known asteroid 3200 Phaethon, which is responsible for the annual December Geminid meteor shower. However, the precise location and identification of the primary asteroid causing this shower have remained unknown.
These asteroids are difficult to observe with regular telescopes due to their proximity to the Sun and brightness. However, studying meteoroids makes it possible to detect hidden and potentially hazardous asteroids invisible to conventional telescopes. According to scientists, NASA’s “NEO Surveyor” mission, scheduled for launch in 2027, will significantly aid in unraveling this mystery. This spacecraft is designed specifically to travel close to the Sun and detect dark asteroids that pose potential threats to Earth. This discovery will not only advance understanding of the solar system’s evolution but also pave the way for successful planetary defense strategies against possible future cosmic collisions.
