Antares launch timeline on the NG-16 mission

Northrop Grumman’s Antares rocket will deliver a Cygnus supply ship into orbit Tuesday to begin a pursuit of the International Space Station.

The rocket’s two RD-181 engines will ignite around 3.7 seconds before liftoff from pad 0A at the Mid-Atlantic Regional Spaceport, a complex owned by the state of Virginia at NASA’s Wallops Flight Facility.

Launch is timed for 5:56 p.m. EDT (2156 GMT) Tuesday, Aug. 10.

The first stage’s two RD-181 engines will power up to 864,000 pounds of thrust and burn for 3 minutes, 18 seconds, then separate from the upper stage’s Castor 30XL motor about six seconds later.

The launch, known as NG-16 in Northrop Grumman’s station resupply manifest, will be the 10th Antares mission using new, more powerful RD-181 engines, which the company ordered from the Russian engine-builder NPO Energomash to replace decades-old Russian-built AJ26 engines blamed for an Antares rocket crash seconds after liftoff in October 2014.

Once the first stage finishes its job on the NG-16 launch, the Antares rocket’s 12.8-foot-diameter (3.9-meter) diameter payload shroud will jettison in two halves at around T+plus 3 minutes, 54 seconds. An interstage adapter that connected the first and second stages will separate at T+plus 3 minutes, 59 seconds.

The launcher’s Castor 30XL solid-fueled upper stage will ignite at T+plus 4 minutes, 7 seconds, and generate up to 104,300 pounds of thrust during a burn lasting approximately 2 minutes, 45 seconds. The second stage motor will burn out at approximately T+plus 6 minutes, 52 seconds, then deploy the Cygnus spacecraft at around T+plus 8 minutes, 52 seconds.

The spacecraft’s two cymbal-shaped electricity-generating solar arrays will unfurl in a fan-like motion around two hours into the mission, and the ship’s thrusters will begin fine-tuning its approach to the space station with a series of course-correction burns, setting up for a laser-guided final approach Thursday, Aug. 12.

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