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Mike Curie, NASA Launch Commentator: Ten seconds

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nine

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eight

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seven

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six

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five

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four..

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three

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two

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one

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And liftoff of OSIRIS-REx

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Its seven-year mission to boldly go to the
asteroid Bennu and back.

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Marty Malinowski, ULA Atlas V Flight Commentator

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(inaudible) look good.

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Pump speeds and (inaudible) pressure

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Chamber pressures have plateaued.

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and have begun to ramp off.

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Mike Curie, NASA Launch Commentator: We're
hearing the voice of Marty Malinowski.

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The Atlas has begun a pitch and yaw maneuver
to steer to its planned 38.5 degrees inclination

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for the equator.

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Marty Malinowski: SRB pressure is almost plateaued
at this point

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(inaudible) pressures look good.

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Mike Curie, NASA Launch Commentator: 45 seconds
into flight

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Marty Malinowski: Hold program is complete

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Boosters have throttled down

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Mike: The Atlas rocket carrying OSIRIS-REx
has gone supersonic.

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We're standing by to pass to Max-Q

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Maximum aerodynamic pressure

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Marty: Max-Q

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Vehicle hydraulics continue to look good.

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Mike: This is the point when the mechanical
stress on the rocket reaches its peak because

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of the rocket's

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velocity and resistance created by the Earth's
atmosphere.

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Marty: Signatures look good.

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Burn altitude is 14 miles.

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Downrange distance is nine miles.

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Current velocity 2,488 miles per hour.

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Range track shows vehicle traversing down
the middle of the range.

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Mike: In about 30 seconds, the single solid
rocket booster will be jettisoned at 2 minutes, 19 seconds

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Marty: And the booster has throttled backed
down.

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It's now 50 percent of its liftoff weight.

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Next major event will be SRB jettison.

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Coming up momentarily.