Hubble Just Spotted a Bizarre New Object in Our Solar System

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Astronomers have identified a weird pair of orbiting asteroids, called 288P, as the first known binary asteroid also classified as a comet. Astronomers recently spotted two space rocks behaving strangely. As the asteroids orbited each other, both of them appeared to be shedding material just like a comet does — observations revealed a coma around the objects as well as a long tail of material. The group have identified this weird system, called 288P, as “the first known binary asteroid also classified as a comet.” There are a few select examples of single asteroids shedding water and dust and leaving behind a comet-like tail, but it’s the first time two of these objects were seen orbiting each other. 288P was first discovered in November 2006 by the astronomical survey Spacewatch. At the time, it was thought to be an asteroid and called Asteroid 300163 (2006VW139). In 2011, the Pan-STARRS telescope spotted cometary activity and the object was renamed 288P. Astronomers didn’t know that 288P was two objects until the Hubble Space Telescope observed it in September 2016, though the team suggested it could be two objects in November 2015. From the objects’ orbit, astronomers could see that 288P originally came from the asteroid belt. Astronomers expect that in the asteroid belt, water ice can only exist for billions of years if it is protected by a covering of dust, perhaps a few meters thick. But 288P sheds water ice as it approaches the sun, indicating that the dust layer is eroded or lost. This artist’s impression shows the binary main-belt comet 288P. From a distance the comet-like features of the system can clearly be seen: among them, the bright coma surrounding both components of the system and the long tail of dust and water pointing away from from the sun. Only a closer look reveals the two components of the system: two asteroids circling each other on an eccentric orbit. | ESA/Hubble, L. Calçada, M. Kornmesser “We detected strong indications of the sublimation of water ice due to the increased solar heating — similar to how the tail of a comet is created,” said Jessica Agarwal, lead author and a scientist at the Max Planck Institute for Solar System Research in Germany, in a statement. “The most probable formation scenario of 288P is a breakup due to fast rotation,” she added, noting that the team estimates that the breakup happened only 5,000 years ago. “After that, the two fragments may have been moved further apart by sublimation torques.”

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