Atlas 3 rocket gives Asian satellite ride to orbit
BY JUSTIN RAY
SPACEFLIGHT NOW

Posted: April 11, 2003

  Launch
The Lockheed Martin Atlas 3B launches with AsiaSat 4. Photo: ILS
 
An Asian telecommunications spacecraft that will cover over 40 countries from the Middle East to New Zealand was successfully launched Friday night by a Lockheed Martin Atlas 3B rocket from Cape Canaveral.

Powered by the Russian RD-180 main engine, the booster blasted off at 8:47 p.m. EDT from pad 36B.

Just over a half-hour later, the "stretched" Centaur upper stage fitted with a single RL-10 engine for this flight deployed the AsiaSat 4 satellite into geosynchronous transfer orbit.

"We are extremely pleased that AsiaSat 4 has successfully completed this stage of the launch. We thank our partners, Boeing Satellite Systems and International Launch Services, for their excellent work and effort in making today's launch a success," said Peter Jackson, chief executive officer of Hong Kong-based Asia Satellite Telecommunications Company Limited.

This was the 64th straight success for the Atlas family of rockets dating back to 1993. It was the third flight of Atlas 3 since 2000.

The mission was managed by International Launch Services -- the joint venture between Lockheed Martin and Russian firms Khrunichev and RSC Engeria to market the Atlas and Proton rocket fleets. This was ILS' first launch in 2003. Officials expect about 10 launches this year, split evenly between the two booster families.

AsiaSat 4 --built by Boeing using the 601HP model design -- will be operated in geostationary orbit at 122 degrees East longitude above the equator to relay television program, business, telephony and broadband services.

 
An artist's concept of AsiaSat 4 in space. Credit: Boeing
 
"AsiaSat 4, along with our two other in-orbit satellites, AsiaSat 2 and AsiaSat 3S, will enable our customers to enjoy wider choices and greater flexibility for regional coverage as well as unbeatable back up across the entire fleet," Jackson said.

As the most powerful member of AsiaSat's satellite fleet, the AsiaSat 4 carries 28 C-band and 20 Ku-band transponders with a 15-year design life. The pan-Asian C-band footprint will cover more than 40 countries and regions spanning from Auckland to Tehran. Its Ku-band coverage will consist of two high-power focused beams for East Asia and Australasia, as well as direct-to-home services in Hong Kong and the adjacent South China region.

The AsiaSat 4 spacecraft, the Atlas 3B rocket and insurance was valued at $240 million, AsiaSat said.

The launch of AsiaSat 4 was delayed from last spring to perform additional testing on the craft.

"Over the last year we have spent a lot of extra time on the spacecraft in El Segundo to make sure that every piece of equipment had the highest quality. So it we went through over a year of integration tests, which is uncommon for the 601HP but it was essential that we make that everything was right for this mission," Dave Ryan, president of Boeing Satellite Systems, told Spaceflight Now.

"Toward the end of that, we particularly concentrated on the ion propulsion system to make sure that all of the design improvements that we were putting into it over the last couple of years were incorporated. So now we are confident that the system will last not only 15 years but it actually has a design capability for 19 years."

Next up for Atlas will be the launch of a Greek communications satellite on May 12 aboard the second Atlas 5 rocket. That is expected to be followed by the mid-June Atlas 2AS mission from Vandenberg Air Force Base in California carrying a classified cargo for the National Reconnaissance Office. Another Atlas 5 is planned in mid-July with the Rainbow 1 direct broadcasting satellite.

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   VIDEO: 3 1/2-MINUTE MOVIE OF ATLAS 3 LAUNCHING ASIASAT 4 QT
   VIDEO: NARRATED PREVIEW OF THIS LAUNCH QT
   VIDEO: PRE-LAUNCH NEWS CONFERENCE HELD THURSDAY QT
   VIDEO: REPLAY OF LAST YEAR'S MAIDEN ATLAS 3B LAUNCH QT
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Flight data file
Vehicle: Atlas 3B (AC-205)
Payload: AsiaSat 4
Launch date: April 11, 2003
Launch window: 8:08 to 9:20 p.m. EDT (0008-0120 GMT on 12th)
Launch site: Complex 36B, Cape Canaveral, Florida
Satellite broadcast: Galaxy 3, Transponder 1, C-band

Pre-launch briefing
Launch timeline - Chart with times and descriptions of events to occur during the launch.

Weather forecast - The latest forecast for launch day conditions.

Launch hazard area - The restricted area during liftoff.

Ground track - See the trajectory the rocket will follow during its flight.

Orbit insertion - Illustration of AsiaSat 4's trek to geostationary orbit.

AsiaSat 4 - Description of communications satellite cargo.

Atlas 3B vehicle data - Description of rocket being used in this launch.

The RD-180 - Facts and figures about the Russian-built engine to power Atlas 3 and 5.

Atlas directory - See our coverage of previous Atlas rocket flights.


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