ULA Delta IV Rocket Launches July 23 with USAF High Capacity Satcom: Watch Live

CAPE CANAVERAL AIR FORCE STATION, FL – A high powered military communications satellite for the US Air Force is now slated for launch on a United Launch Alliance (ULA) Delta IV rocket on Thursday evening, July 23, following a scrub called on Wednesday due to powerful thunderstorms passing too close to the Cape Canaveral launch pad in Florida.

Heavy rain and thunderstorms within range of the Delta IV launch pad at Space Launch Complex-37 at Cape Canaveral Air Force Station, Florida, forced ULA to scrub the blastoff originally set for Wednesday, July 22.

Due to deteriorating weather, ULA technicians were had to stop processing the rocket for launch and were unable to fuel the propellant tanks. Predicted high winds were also a factor in the launch scrub.

The Delta IV liftoff with the Wideband Global SATCOM 7 (WGS 7) satellite was reset for Thursday, July 23, at 8:07 p.m. EDT

The window extends for 39 minutes until 8:46 p.m. EDT.

You can watch the Delta launch live on a ULA webcast that starts at 7:47 p.m. EDT here:


Up close look at base of first stage of United Launch Alliance Delta IV rocket and four solid rocket motors lofting US Air Force WGS 7 military communications satellite into orbit. Launch reset for Thursday, July 23, at 8:07 p.m. EDT. Credit: Ken Kremer/kenkremer.com

The weather forecast for Thursday July 23, calls for a 60 percent chance of acceptable weather conditions at launch time.

The $570 million WGS 7 satellite is part of a significant upgraded constellation of high capacity communications satellites providing enhanced communications capabilities to American troops in the field for the next two decades.

United Launch Alliance Delta IV rocket to carry US Air Force WGS 7 military communications satellite into orbit. Launch reset for Thursday, July 23, at 8:07 p.m. EDT. Credit: Ken Kremer/kenkremer.com

“WGS enables more robust and flexible execution of Command and Control, Communications, Computers, Intelligence,Surveillance and Reconnaissance (C4ISR), as well as battle management and combat support information functions,” according to ULA.

The Delta IV Medium+ rocket will launch in a 5,4 configuration with a 5-meter diameter payload fairing and four solid rocket motors augmenting the first stage core powered by a single RS-68 main engine.

The RS-68 burns cryogenic liquid hydrogen and liquid oxygen which generates about 702,000 lbf of thrust at sea level.

Fueling of the rocket has begun!

Stay tuned here for Ken’s continuing Earth and planetary science and human spaceflight news.

Ken Kremer

Ken Kremer

Dr. Ken Kremer is a speaker, research scientist, freelance science journalist (KSC area,FL) and photographer whose articles, space exploration images and Mars mosaics have appeared in magazines, books, websites and calendars including Astronomy Picture of the Day, NBC, FOX, BBC, SPACE.com, Spaceflight Now, Science and the covers of Aviation Week & Space Technology, Spaceflight and the Explorers Club magazines. Ken has presented at numerous educational institutions, civic & religious organizations, museums and astronomy clubs. Ken has reported first hand from the Kennedy Space Center, Cape Canaveral, NASA Wallops, NASA Michoud/Stennis/Langley and on over 80 launches including 8 shuttle launches. He lectures on both Human and Robotic spaceflight - www.kenkremer.com. Follow Ken on Facebook and Twitter

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