On Jupiter's orbit settled "interstellar immigrant"
Visit us in the past year, the asteroid Oumuamua, flown in from another system, forced scientists to think about, but it was not there in the solar system similar to the guests? Article researchers, recently published in the journal Monthly Notices of the Royal Astronomical Society, suggests that Oumuamua is not the first interstellar envoy. Moreover, the detected object, unlike Oumuamua remained inside the solar system.
In the past, scientists discovered Oumuamua - first interstellar asteroid that came from outside our planetary system. However, it turned out to be only a temporary guest - the object moves in an open hyperbolic trajectory at a speed of about 26 kilometers per second and will soon leave the solar system. Now, researchers have found that 2, 1-kilometer asteroid 2015 BZ509 could also arrive from outer space, but, unlike Oumuamua, he probably stayed in the solar system for good.
Astronomers led by Fathi Namuna from the University of the Côte d'Azur drew attention to the fact that, unlike most of Jupiter's Trojan asteroids 2015 BZ509 revolves around the Sun in a retrograde orbit - that is, moving in the opposite direction. Until now, the cause of the observed phenomenon has remained a mystery to scientists.
"If 2015 BZ509 was born in our system, he would have to move in the same direction as the other planets and asteroids, which appeared out of the original cloud of gas and dust," - commented Namuna.
The researchers conducted a computer simulation, which determined how to change the trajectory of the flight 2015 BZ509 in the history of the solar system. The model showed that all the 4, 5 billion years celestial body moving in a retrograde direction, and therefore could not be born in the same cloud that the Earth and other planets.
"Migration asteroids from other star systems is because the Sun was originally formed in dense clusters, where each star has its own system of planets and asteroids," - said Helena Moreh, one of the authors.
The study "interstellar immigrants", according to astronomers, help to understand how the solar system evolved.
Astronomers today are also aware of two asteroids with hyperbolic trajectories, which soon will leave the solar neighborhood. Scientists suggest that a hyperbolic orbit of celestial bodies came under the influence of Jupiter's gravity.