Delta 4 – Page 6 – Spaceflight Now

December 16, 2025

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Photos: Delta 4 rocket blasts off from Cape Canaveral

March 20, 2019 Stephen Clark

A hydrogen-fueled main engine and four solid rocket boosters combined to propel a United Launch Alliance Delta 4 rocket off its launch pad at Cape Canaveral on March 15, successfully sending a U.S. Air Force communications satellite into orbit.

Delta 4 rocket launches Air Force’s 10th WGS broadband satellite

March 16, 2019 Stephen Clark

United Launch Alliance placed a new satellite in orbit with a fiery Friday night blastoff from Cape Canaveral, using a version of the Delta 4 rocket that is nearing retirement to supplement a U.S. military network relaying signals from drones and battlefield commanders.

Delta 4 rocket’s launch timeline with WGS 10

March 15, 2019 Stephen Clark

A United Launch Alliance Delta 4 rocket will deliver the U.S. Air Force’s tenth Wideband Global SATCOM communications satellite to a supersynchronous transfer orbit around 37 minutes after lifting off from Cape Canaveral.

Photos: Mobile gantry retracted at Delta 4 launch pad

March 15, 2019 Stephen Clark

hese photos show the 330-foot-tall mobile service tower moving into position for liftoff of a Delta 4 rocket from Cape Canaveral’s Complex 37B launch pad Friday.

Live coverage: Delta 4 rocket launches from Cape Canaveral

March 15, 2019 Stephen Clark

A United Launch Alliance Delta 4 rocket lifted off from Cape Canaveral at 8:26 p.m. EDT Friday (0026 GMT Saturday) with the U.S. Air Force’s tenth Wideband Global SATCOM satellite, extending the reach of the military’s highest-capacity satellite communications network.

Photos: Delta 4-Heavy blasts off from Vandenberg

January 26, 2019 Stephen Clark

The first of up to seven United Launch Alliance missions lifted off Jan. 19 from Vandenberg Air Force Base in California, where a Delta 4-Heavy launcher fired into orbit with 2.1 million pounds of thrust from three hydrogen-fueled RS-68A main engines with a U.S. government spy satellite.

Delta 4-Heavy rocket launches U.S. spy satellite into unusual orbit

January 19, 2019 Stephen Clark

A top secret surveillance payload owned by the National Reconnaissance Office soared into space Saturday from Vandenberg Air Force Base in California on top of a United Launch Alliance Delta 4-Heavy rocket, entering an unusual orbit not previously used by the U.S. government’s spy satellite fleet.

Live coverage: Delta 4-Heavy launches from Vandenberg Air Force Base

January 19, 2019 Stephen Clark

United Launch Alliance’s Delta 4-Heavy rocket lifted off at 11:10 a.m. PST (2:10 p.m. EST; 1910 GMT) Saturday from Vandenberg Air Force Base, California, after a month-long delay to troubleshoot a hydrogen leak in one of its boosters. The heavy-lifter was on a mission to send a U.S. government spy satellite into orbit.

First of up to seven ULA launches this year set for Saturday

January 18, 2019 Stephen Clark

The first of up to seven missions planned on United Launch Alliance’s Atlas and Delta rocket fleets this year is scheduled for Saturday from California’s Central Coast, when a Delta 4-Heavy is set for blastoff on a spy satellite delivery flight delayed a month to troubleshoot a hydrogen fuel leak in a booster.

Delta 4-Heavy launch with spy satellite pushed back to January

December 28, 2018 Stephen Clark

After unusual concentrations of hydrogen around the rocket foiled a launch attempt Dec. 19, United Launch Alliance said Friday that the company’s powerful Delta 4-Heavy launcher and a U.S. government spy satellite will remain grounded in California until at least Jan. 6 as engineers troubleshoot a small fuel leak.