A group of hidden asteroids, sharing an orbit with Venus, could pose a future threat to Earth. These asteroids are tough to spot with current telescopes. Recent simulations suggest that, over time, they might drift into paths that intersect with our planet.
Valerio Carruba, a professor at São Paulo State University, points out in a statement that many of these potential hazards remain invisible to us now. “Our study shows that there’s a population of potentially dangerous asteroids that we can’t detect with current telescopes,” he said.
These asteroids are different from those in the main belt between Mars and Jupiter. They orbit the sun in sync with Venus, completing their journey in the same time frame. Because of their alignment, they’re often hidden from view. While 20 co-orbital asteroids are known, most of them have orbits that pull them away from direct sunlight, making them easier to detect during dawn or dusk.
Recently, the Vera C. Rubin Observatory started its operations, but even this advanced telescope might catch only the brightest of these asteroids. Such asteroids would need to be positioned more than 20 degrees above the horizon, which is hard to predict. The team of researchers is advocating for space-based tools like NASA’s Near-Earth Object (NEO) Surveyor to monitor these hidden threats more effectively.
Why should we care about these Venus co-orbitals? Simulations show that some could measure up to 328 yards (or 300 meters) wide. The gravitational forces in that region make their orbits unstable. One moment an asteroid might be near Venus, and in the next, it could come dangerously close to Earth. Carruba warns that, during such transitions, these asteroids might barely skirt Earth’s orbit. If one were to enter our path, the resulting impact could cause devastating effects, creating a crater several miles wide and releasing energy equivalent to hundreds of megatons.
Recent data sheds light on public awareness. Surveys indicate that most people are unaware of such cosmic threats, even as scientists emphasize the need for planetary defense strategies that account for both visible and hidden dangers. As Carruba emphasizes, “Planetary defense needs to consider not only what we can see but also what we can’t yet see.”
The study detailing these findings was published in the July edition of the journal Astronomy & Astrophysics. Staying informed and expanding our observational capabilities could help safeguard against these invisible dangers lurking in Venus’s orbit.
