GPS III SV02 "Magellan" - Delta-IV-M+(4,2) [D-384] - CCAFS, SLC-37B - 22.07.2019, 13:06 UTC

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 Tory Bruno‏ Подлинная учетная запись @torybruno 3 мин. назад

Board is green. No wing to speak of

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Aug 22 15:18
This is Delta Launch Control at T-minus 12 minutes and counting. We will be taking the countdown clock to T-minus 4 minutes before holding there for a planned, 30-minute built-in hold. During the final programmed hold, the status polls by managers will be performed to verify all is in readiness to launch.

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Aug 22 15:20
Anomaly Chief Steve Huff has out briefed the final disposition of the ground software issue that the launch team worked earlier in the countdown this morning. The issue has been closed for flight.

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Aug 22 15:21
Here's how today's launch window works. Launch opportunities are available at the top and bottom of every minute during the launch window that extends from 9:00:30 to 9:27 a.m. EDT. That gives us a total of 54 shots for launching throughout the window today.

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08/22/2019 15:23 Stephen Clark

The countdown continues to tick toward a built-in hold at T-minus 4 minutes, when the clock will be paused to allow the Delta 4 team to be polled for a "go" for launch. Here are some statistics on today's mission:

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• 384th Delta rocket launch since 1960
  
• 40th Delta 4 rocket mission since 2002
  
• 15th Delta 4-Medium+ 4,2 configuration to fly since 2002
  
• 62nd main engine from RS-68 family launched
  
• 20th RS-68A main engine flown
  
• 66th and 67th GEM-60 solid rocket motors flown
  
• 32nd Delta 4 rocket launch from Cape Canaveral Air Force Station
  
• 2nd GPS 3-series satellite to launch
  
• 73rd GPS satellite to launch on ULA heritage vehicle
  
• 135th United Launch Alliance mission since the company's formation in 2006
  
• 4th ULA launch this year
  
• 3rd Delta 4 launch in 2019
  
• 11th orbital launch overall from Cape Canaveral in 2019
  

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Aug 22 15:26
Countdown holding

This is Delta Launch Control at T-minus 4 minutes and holding. The countdown has entered the planned 30-minute, 30-second built-in hold designed to give a bit of margin to deal with any problems. Also during this time, the final readiness polls of the launch team and members of the Mission Management Team will be performed.

We continue to target a liftoff at 9:01 a.m. EDT (1301 UTC) from Space Launch Complex-37 at Cape Canaveral Air Force Station in Florida.

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Aug 22 15:30
The Automatic Determination and Dissemination of Just Updated Steering Terms, better known as the ADDJUST file, is being loaded into the Delta IV rocket's Inertial Navigation and Control Assembly (INCA) flight computer by the flight control operator here at the Launch Control Center. This is the planned steering parameters for the INCA to use based on tonight's upper level wind conditions.

A series of weather balloons has been launched throughout the countdown from the Range weather station at Cape Canaveral to collect measurements of wind speeds and directions to determine if conditions aloft violate the controllability or structural loads on the rocket during ascent. The balloon data was transmitted to ULA engineers in Denver to select a steering profile that minimizes launch vehicle responses.

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Aug 22 15:34
Air Force Launch Weather Officer Will Ulrich just reported that meteorologists are monitoring two rain showers just east of the launch site. Weather is GO currently.

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Aug 22 15:37
Subsequent testing has determined that there is not a hydrogen leak associated with the second stage. Engineers recommend proceeding with the launch countdown today. The 26-minute launch window opens at 9:01amEDT (1301 UTC).

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Aug 22 15:43
Upper level winds have been verified acceptable for liftoff today.

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Aug 22 15:47
The GPS spacecraft atop the Delta IV rocket is transitioning to internal battery power for launch. This is the final configuring of the payload in preparation for liftoff.

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 ULA‏ Подлинная учетная запись @ulalaunch 3 мин. назад

The Global Positioning System is a marvel of the modern world, connecting humanity with the benefits of space and touching the lives of four billion users around the planet. Today's #DeltaIV launch will add a modernized #GPSIIISV02 satellite to the system.

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Aug 22 15:52
GPS III SV02 is configured for launch.

The spacecraft was built by Lockheed Martin for the U.S. Air Force Space and Missile Systems Center. It weighs approximately 8,100 pounds at launch, which includes about 4,700 pounds of hydrazine and nitrogen tetroxide fuel for orbit raising and mission life

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Aug 22 15:53
We will be extending this built-in hold an additional five minutes to complete second stage propellant conditioning.

Today's launch window extends to 9:27 a.m. EDT (1327 UTC).