Earth’s new neighbors are the youngest twin asteroids yet discovered.
But the researchers found the YORP effect was not sufficient to explain the asteroid pair’s orbit. They suggest instead that the asteroid pair’s parent body might have been comet-like, containing water or gaseous ices that sublimated to gas as the parent body passed closer to the sun, the off-gassing accelerating the body’s spin until it broke in two uneven chunks — PR2 is about a kilometer in diameter, and QR6 is about 500 meters in diameter.
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