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The single solid rocket booster has been jettisoned and the first-stage RD-180 engine continues to burn. Next major milestone: booster engine cutoff.

The rocket has passed Mach 1 and is now flying through Max Q.

Liftoff! The United Launch Alliance Atlas V rocket is climbing toward space with NASA’s OSIRIS-REx spacecraft on a mission to boldly go to the asteroid Bennu — and back.

One minute to go. Eastern Range is ‘go.’

Two minutes remaining in the countdown. The Atlas V rocket is on internal power. The launch team’s primary communications channels are quiet as the final minutes tick by.

When the countdown clock reaches zero, the Atlas V booster engine and single solid rocket booster ignite and the flight begins. The vehicle reaches Mach 1 after about 57 seconds, then flies through “Max Q,” the area of maximum aerodynamic pressure, about 12 seconds later. The rocket’s single solid rocket booster will be jettisoned after …

The countdown has resumed and there are four minutes remaining until the 7:05 p.m. liftoff of the United Launch Alliance Atlas V rocket carrying NASA’s OSIRIS-REx spacecraft.

The switch to internal power is complete. Standing by to pick up the countdown at 7:01 p.m.

Launch Conductor Scott Barney has checked in with his ULA team members and they confirmed they are go to resume the countdown at the T-4 minute mark. The hold will be released at 7:01 p.m. Liftoff is on schedule for 7:05 p.m. EDT.

OSIRIS-REx is switching from ground-based to internal power.