Spaceflight Now Home



The Mission




Rocket: Delta 4-Heavy
Payload: DemoSat
Date: December 21, 2004
Window: 2:36-5:31 p.m. EST (1936-2231 GMT)
Site: SLC-37B, Cape Canaveral, Florida
Satellite feed: AMC 9, Transponder 18, C-band

Mission preview story

Launch events timeline

Launch hazard area

D4-H story/photo archive



The Launcher




Boeing's Delta 4-Heavy vehicle is the largest, most powerful configuration in the next-generation rocket's family.

Delta 4-Heavy fact sheet

The pre-launch process

Our Delta archive



The Payload




The DemoSat satellite simulator and two university-built nanosats will be launched on the Delta 4-Heavy rocket's test flight.

Learn more



NewsAlert



Sign up for our NewsAlert service and have the latest news in astronomy and space e-mailed direct to your desktop.

Enter your e-mail address:

Privacy note: your e-mail address will not be used for any other purpose.



Air Force says plenty of good came from Delta 4 test
BY JUSTIN RAY
SPACEFLIGHT NOW

Posted: December 22, 2004

While stressing the positives of Tuesday's demonstration flight of the Boeing Delta 4-Heavy rocket and the mountain of data generated about the big booster's actions, Air Force officials on Wednesday acknowledged an "anomaly" occurred during the first stage and two university-built nanosats were lost after not reaching orbit.


The Boeing Delta 4-Heavy rocket launches from Cape Canaveral on its test flight. Credit: Tom Rogers/T-Minus Productions
 
Carrying a 6.5-ton sensor-laden dummy satellite and the nanosat pair, the rocket blasted off at 4:50 p.m. EST (2150 GMT) from pad 37B at Cape Canaveral Air Force Station, Florida, on its maiden voyage financed by the U.S. military and Boeing.

The Air Force purchased this test launch as a dress rehearsal for the Delta 4-Heavy rocket before costly national security missions begin flying atop the vehicle next year. The rocket offers the largest payload-carrying capacity currently available in the Evolved Expendable Launch Vehicle (EELV) program that includes Lockheed Martin's Atlas 5.

"The Air Force/Boeing team will spend the next two months going through the pre-planned review of flight data in preparation for the next launch," the Air Force's Space and Missile Systems Center said in a statement Wednesday.

   PHOTO GALLERY: FIRST LAUNCH VIEWS
   PHOTO GALLERY: ROCKET FLIES DOWNRANGE
   PHOTO GALLERY: CAMERAS AT LAUNCH PAD
   PHOTO GALLERY: MORE STUNNING PICTURES


While climbing away from Earth, the two strap-on Common Booster Cores appeared to burn out and separate several seconds early. The center booster of the first stage finished firing and jettisoned a minute-and-a-half later, apparently early as well, leaving the rocket's upper stage to begin a planned 7-minute engine burn to reach a targeted 100 by 135 nautical mile orbit where the tiny nanosats would be released for a one-to-two-day experimental mission.

But the under-performance from the early shutdown of the Common Booster Cores left the upper stage to compensate, forcing its RL10 engine to fire longer and use more fuel than planned.

The exact duration of the upper stage burn was not immediately announced in real-time as live telemetry from rocket being relayed to Cape Canaveral broke up during a handover from one tracking site to another.

When the next station acquired the vehicle's signal a couple of minutes later, the burn was over. The nanosats were to be deployed in low-Earth orbit, but the Air Force said Wednesday that the tiny craft were released at far too low of an altitude to survive.

"The Nanosats were released at the proper time, demonstrating a new low-shock separation system, which will be used in future systems. In addition, the Nanosats were successfully integrated onto the DemoSat in a remarkably short four-month period, thus providing a successful demonstration of a responsive space mission," the Air Force statement said.

"However, the early shutdown resulted in separation at an altitude of approximately 57 miles, which was not sufficient to achieve orbit."

The upper stage then re-ignited for the second of three scheduled firings during the launch to reach the intended geosynchronous orbit. This burn was expected to produce an orbit with a high point of 19,650 nautical miles, low point of 148 nautical miles and inclination of 27.3 degrees. Although the exact numbers of the actual orbit reached were not formally released, Boeing indicated the altitude was close to the projections.

The rocket then began a five-hour coast to reach the orbit's high point where the final burn would occur to circularize the orbit at 19,623 nautical miles above the planet at an inclination of 10 degrees for deployment of the DemoSat primary test payload.

But the stage's fuel supply was greatly impacted by the extended maneuvers to overcome the first stage problem. Instead of firing for more than three minutes to achieve the proper orbit, the stage depleted its cryogenic propellants and shut down approximately a minute prematurely.

The result was an orbit featuring a high point of approximately 19,600 nautical miles (36,400 km), low point of 9,600 nautical miles (19,000 km) and inclination of 13.5 degrees. DemoSat was released as programmed into the elliptical orbit with the low point about 10,000 miles short of the target altitude.

"The EELV program office is leading an effort to determine the cause of this anomaly. The Delta 4 flight featured a substantial increase in telemetry over previous first-flight rocket launches. Engineers will be able to use this data to evaluate all aspects of the mission, including the early cutoff of the first stage. The Air Force has no plans to fly another Delta 4-Heavy flight demonstration."

Despite the trouble, the Air Force reported that the demo flight completed these primary flight objectives:

  • Activation and launch from the heavy-version of the Delta 4 launch pad
  • Flying three Common Booster Cores
  • Separating the two strap-on Common Booster Cores from the center booster core
  • Flying the first 5-meter diameter payload fairing and separating it from the vehicle
  • Flying the first 5-meter diameter cryogenic upper stage
  • Flying the new upper stage through a long duration, 3-burn profile of its engine

"We are very pleased with the overall performance of the Delta 4-Heavy Demo in meeting these test objectives," said Col. John Insprucker, Evolved Expendable Launch Vehicle program director at the Space and Missile Systems Center and the mission director for this launch.

"The EELV program and Boeing invested in today's demonstration launch to ensure that the Delta 4-Heavy, the only EELV Heavy variant available, is ready to launch our nation's most important national security payloads into space," said Dan Collins, vice president of Boeing Expendable Launch Systems. "While the demonstration satellite did not reach its intended orbit, we now have enough information and confidence in the Delta 4-Heavy to move forward with preparations for the upcoming Defense Support Program launch in 2005."

The first operational Delta 4-Heavy, presently scheduled for August, will carry the final Defense Support Program craft that detects enemy missile launches and nuclear weapon detonations from space. The rocket must fly a trajectory similar to the test flight's intended course to deliver DSP-23 directly into geostationary orbit over the equator. A problem like the one experienced Tuesday would leave the payload within an unusable orbit and uncertain of boosting itself the remaining altitude.

A secret National Reconnaissance Office payload is slated to fly on the second operational Heavy mission next December. What type of orbit this cargo is destined for has not been disclosed.

Beyond next year's two launches, the long-range military outlook for Heavy missions is sparse.

"The NRO still has another heavy satellite that will be ready to launch in about 2008," Col. Insprucker said at the pre-launch news conference earlier this month. "After that we've got a little hiatus, I think, until probably the Transformational Communication Satellite architecture comes forward."

The Delta 4-Heavy can loft payloads comparable in weight to the Titan 4 rocket that has been in service since 1989. But that Lockheed Martin-built booster is being retired after two more flights next year from Florida and California. The Delta promises to provide launches far cheaper than Titan.

Lockheed Martin's heavy-lift Atlas 5 configuration is proceeding through development and would be ready to fly its inaugural flight 30 months from the time one is ordered, the company has said.

Spaceflight Now Plus
Additional coverage for subscribers:
VIDEO: FROM LIFTOFF TO BOOSTER SEPARATION QT
VIDEO: THE DELTA 4-HEAVY LAUNCH (SHORT VERSION) QT
VIDEO: ONBOARD CAMERA RECORDS LAUNCH QT
VIDEO: ONBOARD CAMERA SEES BOOSTER SEPARATION QT
VIDEO: ONBOARD CAMERA CAPTURES FAIRING JETTISON QT

AUDIO: LISTEN TO THE 68-MINUTE PRE-LAUNCH NEWS CONFERENCE QT
VIDEO: ANIMATION PROVIDES PREVIEW OF A DELTA 4-HEAVY LAUNCH QT
VIDEO: RE-LIVE THE INAUGURAL DELTA 4 LAUNCH FROM 2002 QT
VIDEO: ON-PAD FLIGHT READINESS ENGINE FIRING TEST QT
VIDEO: TAKE TOUR OF LAUNCH PAD 37B QT
SUBSCRIBE NOW

Apollo 12 tribute DVD set

New! Featuring the jovial crew of Pete Conrad, Dick Gordon and Alan Bean, the Apollo 12 mission was struck by lightning shortly after liftoff but proceeded on the second successful exploration voyage to the lunar surface. This three-disc DVD brings the mission to life with extraordinary detail.
 Choose your store:
U.S. - U.K. - E.U. - Worldwide

Fallen Heroes special patch
This special 12-inch embroidered patch commemorates the U.S. astronauts who made the ultimate sacrifice, honoring the crews of Apollo 1, Challenger and Columbia.
 Choose your store:
U.S. - U.K. - E.U. - Worldwide

Women in Space
Women of Space: Cool Careers on the Final Frontier is for girls, young women, and anyone else interested in learning about exciting careers in space exploration. Includes CD-ROM.
 Choose your store:
U.S. - U.K. - E.U. - Worldwide

Mars rover poster
This new poster features some of the best pictures from NASA's amazing Mars Exploration Rovers Spirit and Opportunity.
 Choose your store:
U.S.

New Station
Crew Patch


Free shipping to U.S. addresses!

The Expedition 38 embroidered crew patch for the International Space Station is now available in our store!
 U.S. STORE
 WORLDWIDE STORE


Columbia Report
The official accident investigation report into the loss of the space shuttle Columbia and its crew of seven. Includes CD-ROM.
 Choose your store:
U.S.

Columbia Report
A reproduction of the official accident investigation report into the loss of the space shuttle Columbia and its crew of seven.
 Choose your store:
U.S. - U.K. - E.U. - Worldwide

Mars Panorama

DISCOUNTED! This 360 degree image was taken by the Mars Pathfinder, which landed on the Red Planet in July 1997. The Sojourner Rover is visible in the image.
 Choose your store:
U.S.

Apollo 11 Mission Report
Apollo 11 - The NASA Mission Reports Vol. 3 is the first comprehensive study of man's first mission to another world is revealed in all of its startling complexity. Includes DVD!
 Choose your store:
U.S. - U.K. - E.U. - Worldwide

Rocket DVD
If you've ever watched a launch from Kennedy Space Center, Cape Canaveral, Vandenberg Air Force Base or even Kodiak Island Alaska, there's no better way to describe what you witnessed than with this DVD.
 Choose your store:
U.S. - U.K. - E.U. - Worldwide
MISSION STATUS CENTER

INDEX | PLUS | NEWS ARCHIVE | LAUNCH SCHEDULE
ASTRONOMY NOW | STORE

ADVERTISE

© 2014 Spaceflight Now Inc.