The Minor Planet Center tracks minor planets, near Earth objects, and comets in our solar system. They keep a list on their website of possible near Earth objects that need confirmation.
Asteroids are also known as minor planets
asteroids are all classified in categories determined by the materials that they're made out of ("C", "S", and "M") "C" - chondrite, most common asteroid, probably consist of clay and silicate rocks "S" - "stony", silicate materials and nickel-iron "M" - metallic, nickel-iron These differences are due to how far away from the sun they were formed
Asteroids can have moons, similarly to larger planets
radar is a great and useful tool for detecting and monitoring asteroids, especially near-Earth one that pose a threat Follow the latest asteroid missions and discoveries at https://www.nasa.gov/asteroid-and-comet-watch