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These are 42 of the largest asteroids in the Solar System – Observer

The European Southern Observatory (ESO) has revealed images of the 42 largest asteroids located between the orbits of Mars and Jupiter. The images show a wide range of shapes and can help astronomers track the origin of asteroids in the Solar System.

“Until now, only three large main-belt asteroids, Ceres, Vesta and Lutetia, had been photographed in such a high level of detail, at the time they were visited by NASA and ESA space mission probes Dawn and Rosetta” , said Pierre Vernazza, from the Astrophysics Laboratory in Marseille, France, responsible for the study published this Tuesday in the scientific journal Astronomy & Astrophysics. “Our observations of the THAT provided clear images of many more targets, 42 in total,” he added.

To obtain this level of sharpness, ESO used its Very Large Telescope (VLT), located in Chile, and with Spectro-Polarimetric High-contrast Exoplanet Research (SPHERE) technology, which allowed the identification of various forms of these asteroids, as per example spheres or the shape of a bone.

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In this sense, the team of astronomers concluded that asteroids are divided into two families: those with spherical shapes, as is the case of Hygiea and Ceres, while others have an elongated shape, similar to a dog bone, as is the case of Kleopatra.

Most of the 42 identified asteroids are larger than 100 kilometers in size. The two largest are Ceres and Vesta, respectively 940 km and 520 km in diameter, and the smallest are Urania and Ausonia, both 90 km in diameter, according to ESO. As for mass, the four least dense, Lamberta and Sylvia, have a density of 1.3 grams per cubic centimeter, while the densest, Psyche and Kalliope, have densities of 3.9 and 4.4 grams per cubic centimeter.

With technological advances, particularly with the construction of the Extremely Large Telescope (ELT), astronomers hope to achieve even more detailed images over the next decade, which could help uncover the origins of asteroids in the Solar System. “Main belt asteroid observations with the ELT will allow us to study objects with diameters between 35 and 80 km, depending on their location in the belt, and craters with dimensions of approximately 10 to 25 km,” predicts astronomer Pierre Vernazza, from the Astrophysics Laboratory in Marseilles.

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