Vesta: The Largest Asteroid in the Solar System and Its Unique Features

Vesta, with a diameter of about 530 kilometers, is the largest asteroid in the Solar System since Ceres was reclassified as a dwarf planet in 2006 Source: excelsiormx, mileniomx. Located in the main asteroid belt between Mars and Jupiter, Vesta accounts for nearly 9% of the belt's total mass. It formed just 1-2 million years after the Solar System's birth, making it one of the oldest known objects Source: excelsiormx.

Key features

• Massive mountain: The crater Rheasilvia, caused by a collision a billion years ago, is about 500 km wide and hosts a central peak roughly 20 km high—twice the height of Mount Everest Source: mileniomx.
• Differentiated interior: Unlike most asteroids, Vesta has a crust, mantle, and core, similar to Earth. This resulted from early radioactive heating that melted its interior Source: excelsiormx, mileniomx.
• Impact history: About 300 dark asteroids (1-10 km in diameter) have struck Vesta in the last 3.5 billion years. Some fragments have reached Earth as meteorites, offering direct samples Source: excelsiormx.

NASA's Dawn mission orbited Vesta from 2011–2012, providing detailed data. While Excelsior notes diameter measurements range from 522 to 530 km, Milenio reports a consistent 530 km. Both agree on its significance for understanding planetary formation.