Sentinel is a space-based infrared (IR) survey mission to discover and catalog 90 percent of the asteroids larger than 140 meters in Earth’s region of the solar system. The mission should also discover a significant number of smaller asteroids down to a diameter of 30 meters. Sentinel will be launch

Asteroids are a scientific and economic opportunity in that they contain the original building blocks of the Solar System. They are targets for future human exploration, and may contain valuable raw materials for mining. These asteroids are also a threat in that they can pose great risk to humanity ...

The non-profit B612 Foundation aims to build, launch, and operate the first privately funded deep space mission—a space telescope in orbit around the Sun that will map the inner Solar System in search of asteroids that could impact Earth.