First interstellar immigrant discovered in the Solar System
A new study has discovered the first known permanent immigrant to our Solar System. The asteroid, currently nestling in Jupiter's orbit, is the first known asteroid to have been captured from another star system. The work is published in Monthly Notices of the Royal Astronomical Society: Letters. The object known as 'Oumuamua was the last interstellar interloper to hit the headlines in 2017. However it was just a tourist passing through, whereas this former exo-asteroid - given the catchy name (514107) 2015 BZ509 - is a long-term resident. Read more
Backwards asteroid 2015 BZ509 shares an orbit with Jupiter without crashing
There's an asteroid in Jupiter's lane that orbits the sun in the wrong direction - and it may have been doing so for more than a million years. The asteroid 2015 BZ509 was discovered in 2015, orbiting near Jupiter but in the opposite direction. Like Jupiter and the other asteroids tied to its orbit, which are called Trojans, it takes 12 Earth years to orbit the sun. Read more