SpaceX’s Polaris Dawn mission will launch American billionaire Jared Isaacman and three others on a five-day flight to attempt the world’s first private spacewalk. The mission is the first of three Polaris Program spaceflights with SpaceX, and the second personally financed by Isaacman.

The Polaris Dawn mission is scheduled to launch on Aug. 27 at 3:38 a.m. EDT (0738 GMT) during a four-hour launch window. It will fly on a Falcon 9 rocket and the Crew Dragon capsule Resilience, making its third flight. Isaacman will serve as mission commander; with US Air Force Lt. Col (retired) Scott “Kidd” Poteet as pilot; Sarah Gillis, SpaceX lead space operations engineer for astronaut training, as mission specialist; and Anna Menon, SpaceX lead operations engineer for crew operations development, as mission specialist and medical officer.