WEBVTT

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Tracy Young/Launch Commentator: T minus 
10, nine, eight, seven, six, five,

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four, three, two, one, we have ignition and liftoff of

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Aquarius and the SAC-D observatory on an international mission to study Earth's salty sea.

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Steve Agid/Ascent Commentator: A burn nicely from the initial launch transient.

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Main engine control is good. Vernier control is good. Coming up on 36 seconds.

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Mark, 36 seconds. Mach 1, vehicle now 
going transonic. Forty-two seconds,

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still looking good. Good chamber pressure is holding.

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Forty-nine seconds in, Max Q, maximum dynamic pressure in the vehicle.

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Coming up on the one-minute mark as we're standing by for solid burnout.

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Chamber pressure beginning to drop in the solids. We have burnout.

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We'll be holding on to those solids for about another 30 seconds to assure we have a safe water impact point.

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Once minute, 13 seconds into the flight. One minute, 25 seconds, mark.

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Standing by for separation of the three ground-lit solids.

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Should be happening any second now. And we have separation command.

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Separation, one minute, 45 seconds in, the 
Delta II vehicle only weighs about half of what it did at launch.

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It's burning propellants at the rate of about 
the weight of 800 pounds per second.

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