May 24, 2019

Atlas 5 rocket, U.S. Air Force satellite arrive at Cape Canaveral for June launch


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The first stage of ULA’s Atlas 5 rocket is unloaded from the Mariner transport ship after arriving at Cape Canaveral on April 21. Credit: United Launch Alliance

Atlas 5 rocket hardware and a U.S. Air Force communications satellite have arrived at Cape Canaveral for United Launch Alliance’s next mission, scheduled for liftoff June 27.

The equipment arrived at the Florida spaceport last weekend on separate shipments aboard an Air Force C-5 cargo plane and and ULA’s Mariner transport vessel.

The Air Force’s fifth Advanced Extremely High Frequency communications satellite rode a C-5 airlifter from Lockheed Martin’s factory in Sunnyvale, California, and arrived at Cape Canaveral on April 20. The rocket-carrying Mariner transport ship arrived at Port Canaveral on April 21 after a trip from ULA’s manufacturing plant in Decatur, Alabama, delivering the first and second stages of AEHF 5’s Atlas 5 launcher.

Teams will spend the next couple of months readying AEHF 5 and the Atlas 5 rocket for liftoff June 27 from Cape Canaveral’s Complex 41 launch pad. The mission will mark the 80th flight of an Atlas 5 rocket since 2002, and the first Atlas 5 launch of the year.

The Atlas 5, designated AV-083, will launch in its most powerful variant with five strap-on solid rocket boosters built by Aerojet Rocketdyne and a 5-meter-diameter (17.7-foot) payload fairing made by Ruag Space, a configuration known as the Atlas 5-551 that has flown nine times before. The five solid-fueled motors will provide an extra boost to the Atlas 5’s first stage, powered by a Russian-made RD-180 main engine that burns kerosene and liquid oxygen propellants.

The combined power of the boosters and main engine will give the Atlas 5 around 2.6 million pounds of thrust at liftoff.

ULA’s Mariner transport ship carries rocket hardware from the company’s factory in Decatur, Alabama, to launch sites in Florida and California. Credit: United Launch Alliance

Workers unloaded the Atlas 5’s first stage and Centaur upper stage, powered by an Aerojet Rocketdyne RL10 engine, from the Mariner transport ship Monday. ULA teams transferred the first stage to the Atlas Space Operations Center for checkouts before it is stacked vertically on the mobile launch platform at the Complex 41 launch pad. The Centaur upper stage will be be integrated with an interstage adapter and the lower part of the Atlas 5’s payload shroud in the coming weeks, according to ULA.

Ground crews will hoist the Atlas 5 first stage, five solid rocket boosters and the Centaur upper stage on the mobile launch table inside the Vertical Integration Facility at Complex 41. Working in a nearby clean room, technicians will fuel the AEHF 5 satellite and encapsulate the spacecraft inside the Atlas 5’s nose cone before raising the payload atop the launcher inside the VIF.

The launch of AEHF 5 follows Atlas 5 missions that deployed four previous AEHF satellites in 2010, 2012, 2013 and 2018.

The AEHF satellites provide secure communications services to the U.S. military, working together in a network the Air Force says is resilient to jamming, cyber attacks, and even nuclear war. The AEHF spacecraft are positioned in geostationary orbit more than 22,000 miles (nearly 36,000 kilometers) over the equator, using a cross-linked architecture allowing the satellites to relay signals between one another without transmitting to ground stations.

The spacecraft are built by Lockheed Martin, with communications payloads produced by Northrop Grumman.

Artist’s concept of an AEHF satellite in orbit. Credit: U.S. Air Force/Lockheed Martin

“The payload supports communication missions with increased coverage, capacity, and protections against electronic jamming which gives our warfighters the best advantage against our adversaries,” said Brig. Gen. Steve Whitney, program executive officer for the Space Production Corps.

The AEHF network is also used by Canada, the United Kingdom and the Netherlands, and replaces the Air Force’s aging Milstar constellation.

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Follow Stephen Clark on Twitter: @StephenClark1.


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