Watch the Falcon Heavy fire up its engines

The Starlink 17-13 mission also represented the 180th Falcon 9 launch from pad 4E at Vandenberg Space Force Base. Liftoff happened 5:59:59 p.m. PST (8:59:59 p.m. EST / 0159:59 UTC).

The debut launch of an upgraded version of Orbital ATK’s Antares rocket has slipped to Friday after ground teams resolved a minor vehicle issue and made emergency preparations for Hurricane Matthew, which bypassed the Antares launch site on Virginia’s Eastern Shore this weekend.

Virgin Orbit is setting modest expectations ahead of the company’s first attempt to reach orbit with a liquid-fueled air-launched rocket, emphasizing a hunger for flight data on the test launch, which could occur as soon as Monday off the coast of Southern California.