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The asteroids Ryugu and Bennu were formed by the destruction of a large asteroid by Staff Writers Paruis, France (SPX) May 28, 2020
What is the origin of the asteroids Bennu and Ryugu, and of their spinning-top shape? An international research team led by Patrick Michel, a CNRS researcher at the Laboratoire Lagrange and Ronald-Louis Ballouz from the University of Arizona, proposes an answer to this question in an article published in Nature Communications on May 27, 2020. Numerical simulations of large asteroid disruptions, such as those that take place in the asteroid belt between Mars and Jupiter, show that during such events, fragments are ejected and then reaccumulate forming aggregates, some of which have a spinning-top shape. The simulations also show that Bennu and Ryugu may have formed from the disruption of the same parent asteroid even though their levels of hydration are different. The scientists conclude that the overall properties of these asteroids could directly result from the disruption of their parent body. The analysis of return samples from Ryugu and Bennu by the Hayabusa2 (JAXA) and OSIRIS-REx (NASA) spacecraft will allow us to verify this by measuring precisely their composition and by determining their formation age.
Research Report: "Collisional formation of top-shaped asteroids and implications for the origins of Ryugu and Bennu"
UH ATLAS telescope discovers first-of-its-kind asteroid Honolulu HI (SPX) May 22, 2020 We often think of asteroids and comets as distinct types of small bodies, but astronomers have discovered an increasing number of "crossovers." These objects initially appear to be asteroids, and later develop activity, such as tails, that are typical of comets. Now, the University of Hawaii's Asteroid Terrestrial-impact Last Alert System (ATLAS) has discovered the first known Jupiter Trojan asteroid to have sprouted a comet-like tail. ATLAS is a NASA-funded project ... read more
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