dangerous asteroids and other near-Earth objects that pose a risk of collision with Earth. In the absence of substantive planetary defense provided by governments worldwide, B612 attempted a fundraising campaign to cover the Sentinel Mission, estimated at $450 million for 10 years of operation. Fundraising was unsuccessful, and the program was cancelled in 2017, with the Foundation pursuing a constellation of smaller satellites instead.

The B612 Foundation is named for the asteroid home of the eponymous hero of Antoine de Saint-Exupéry's