Jupiter’s Backwards Little Friend

(Syfy Wire::Bad Astronomy) – Phil Plait:

Asteroid 2015 BZ509 is very roughly three kilometers in diameter. As the name implies, it was first discovered in 2015. Right away, it was clear it was retrograde. Intriguingly, though, the orbit calculated based on the observations showed it was in a similar orbit as Jupiter. Not exactly, but close. And that is very odd, indeed. …

blastr 2017-3-29 bz509

BZ509 orbit

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