Delta 4 – Page 3 – Spaceflight Now

Delta 4-Heavy launch aborted at T-minus 7 seconds

October 1, 2020 Stephen Clark

Another countdown for United Launch Alliance’s next Delta 4-Heavy rocket mission ended without a liftoff Wednesday after a computer sequencer detected a potential problem just before engine ignition.

Mobile gantry wheeled away from Delta 4-Heavy rocket at Cape Canaveral

September 30, 2020 Stephen Clark

United Launch Alliance teams rolled the Mobile Service Tower away from a Delta 4-Heavy rocket at Cape Canaveral’s Complex 37B launch pad Wednesday in preparation for liftoff on a national security mission.

Live coverage: Delta 4-Heavy countdown halted in final seconds

September 28, 2020 Stephen Clark

United Launch Alliance scrubbed the launch of a Delta 4-Heavy rocket Wednesday night less than 10 seconds before liftoff from Cape Canaveral, the second such abort suffered by this mission.. The launch of a classified National Reconnaissance Office spy satellite is expected to be delayed at least several more days as engineers assess the cause of Wednesday’s last-minute abort.

After weather scrub, Starlink launch to wait for pair of national security missions

September 28, 2020 Stephen Clark

Continuing a dizzying series of rescheduled launches from Florida’s Space Coast, poor weather at the Kennedy Space Center forced SpaceX to keep a Falcon 9 rocket and 60 Starlink broadband satellites on the ground Monday. The Starlink launch is expected to be delayed until Thursday, after a pair of national security missions are set to blast off from Cape Canaveral Tuesday.

Delta 4-Heavy launch delayed by ground system issue

September 24, 2020 Stephen Clark

United Launch Alliance’s next launch attempt for its Delta 4-Heavy rocket from Cape Canaveral with a top secret U.S. government spy satellite will be delayed to no earlier than early Tuesday.

ULA targeting Sept. 26 for next Delta 4-Heavy launch attempt

September 17, 2020 Stephen Clark

United Launch Alliance said Thursday it is targeting Sept. 26 for the next attempt to send a classified U.S. government spy satellite into orbit aboard a Delta 4-Heavy rocket, following an abort Aug. 29 just three seconds before liftoff from Cape Canaveral.

Up to three launches planned this weekend from Cape Canaveral

August 28, 2020 Stephen Clark

Delays have set up the possibility of up to three rocket launches this weekend from different pads along Florida’s Space Coast, including two SpaceX missions on Sunday that could set a company record for the shortest span between two Falcon 9 rocket launches. But in the world of ever-changing launch schedules, numerous factors such as weather and technical issues could thwart launch plans this weekend.

ULA calls off launch of triple-core Delta 4-Heavy rocket, will try again Saturday

August 27, 2020 Stephen Clark

United Launch Alliance early Thursday delayed the launch of a triple-core Delta 4-Heavy rocket — the largest launcher in the company’s fleet — until Saturday to allow engineers more time to resolve an issue with a ground pneumatics control system.

Photos: Mobile gantry retracted from ULA’s Delta 4-Heavy for Aug. 27 launch attempt

August 26, 2020 Stephen Clark

Towering more than 30 stories tall, the mobile gantry structure at the Delta 4-Heavy rocket’s launch pad at Cape Canaveral was wheeled into position for liftoff of the triple-core launcher Thursday with a classified payload for the National Reconnaissance Office.

Live coverage: Launch of Delta 4-Heavy aborted seconds before liftoff

August 26, 2020 Stephen Clark

The launch of a United Launch Alliance Delta 4-Heavy rocket from Cape Canaveral was aborted three seconds before a planned liftoff at 3:28 a.m. EDT (0728 GMT). The rocket was set to loft a classified payload for the National Reconnaissance Office, the U.S. government’s spy satellite agency.