SpaceX kicks off the year with launch of Thai satellite
BY STEPHEN CLARK
Posted: January 6, 2014
Launching for the second time in five weeks, a SpaceX Falcon 9 rocket lifted off from Cape Canaveral on Monday and successfully put a broadcasting satellite in a high-altitude orbit for a Thai communications operator.
The 224-foot-tall rocket lifted off in a blaze of golden exhaust at 2206 GMT (5:06 p.m. EST), and its on-board guidance computer maneuvered the slender white booster east from Cape Canaveral's Complex 40 launch pad, soaring over the Atlantic Ocean and through a deck of overcast clouds less than a minute into the flight.
SpaceX's webcast streamed video from cameras mounted on the rocket, showing a smooth ascent into the upper atmosphere before the Falcon 9 shed its nine-engine first stage about three minutes after liftoff.
The second stage's Merlin 1D engine, fitted with an expansive nozzle optimized for firing in a vacuum, ignited to propel the Thaicom 6 spacecraft into a temporary orbit. The second stage shut down its engine and coasted across the Atlantic before restarting to boost Thaicom 6 into a targeted orbit reaching as high as 90,000 kilometers, or 55,923 miles.
SpaceX confirmed the launch was successful on the company's Twitter account: "Falcon 9 has successfully deployed Thaicom 6 into its target orbit."
SpaceX worked over the holidays to ready the Falcon 9 launch pad after the company's successful Dec. 3 launch of the SES 8 television broadcasting satellite, marking the Falcon 9's first mission to geostationary transfer orbit.
Officials delayed the launch from Friday to resolve a technical concern with the Falcon 9 rocket.
Emily Shanklin, a SpaceX spokesperson, said the company did not plan to recover the first stage from Monday's launch, giving Thaicom 6 all the power it needs to soar into a high-altitude orbit stretching as high as 90,000 kilometers, or 55,923 miles, from Earth.
The rocket was shooting for an orbit with a targeted perigee, or low point of 295 kilometers, or 183 miles, and an inclination of 22.5 degrees. Reports from SpaceX say the rocket nailed it.
Orbital Sciences Corp., builder of the Thaicom 6 satellite, reported it was healthy and performing well early in its mission. In the next few weeks, the satellite will fire its on-board engine to reach a circular orbit 22,300 miles over the equator.
SpaceX hopes to make the Falcon 9's first stage reusable, eventually guiding the spent rocket stages back to a rocket-assisted touchdown on a landing pad near the launch site. Engineers tested the terminal phase of a first stage's return with a testbed named Grasshopper, which completed hops as high as 2,400 feet at SpaceX's rocket development facility in McGregor, Texas.
On the Falcon 9 rocket's first flight from Vandenberg Air Force Base in California on Sept. 29, SpaceX attempted to recover the first stage with a controlled soft landing in the Pacific Ocean south of the launch site. The rocket re-ignited its engines to slow its speed for splashdown, but the first stage began spinning and the leftover propellant in the fuel tanks centrifuged outward and away from lines leading to the engines, causing a premature engine shutdown.
Thaicom said in 2011 the Thaicom 6 project was a $160 million investment for the company, including the spacecraft, launch services and insurance.
Thaicom 6's operator has sold more than 66 percent of the satellite's capacity, according to a Dec. 25 press release. Thaicom 6 will be positioned in geostationary orbit at 78.5 degrees east longitude, reaching customers across the Asia-Pacific and parts of Africa.
The satellite will provide the broadcast industry with improved television quality and additional high-definition channels, according to Thaicom. It carries 18 C-band and eight Ku-band transponders connected to three antennas.
In May, Thaicom announced it acquired an unidentified satellite already in orbit to provide interim communications capacity from the 78.5 degrees east position while waiting for the launch of Thaicom 6.
Fearing Thaicom 6 would not be launched to meet regulatory deadlines, Thaicom said the newly-acquired in-orbit satellite would ensure digital terrestrial television stations waiting to use Thaicom 6 complied with "must-carry" regulations requiring broadcasting by a certain date.
Jonathan McDowell, an astrophysicist at Harvard-Smithsonian Center for Astrophysics who tracks global satellite and launch activity, said the AsiaSat 7 satellite was the only candidate for the acquisition by Thaicom. It maneuvered into position last summer at 78.6 degrees east longitude, based on publicly available orbital tracking data, McDowell said.
The launch of SES 8 required an in-flight restart of the Falcon 9's upper stage Merlin 1D engine, a tricky endeavor which failed on a test flight of SpaceX's upgraded Falcon 9 rocket in September.
The launch of Thaicom 6 largely duplicated the Dec. 3 flight, sending the 3.6-ton satellite to an orbit stretching more than 50,000 miles from Earth at its highest point. The mission will take about a half-hour from launch to spacecraft separation.
It marked the eighth flight of a Falcon 9 rocket since 2010, and the third launch of the launcher's newest version since its debut in September in a flight from Vandenberg Air Force Base in California.
The Falcon 9 has established a nearly perfect track record in seven launches to date, with the only blemish coming during an October 2012 launch when one of the rocket's nine first stage engines shut down prematurely. The loss of thrust doomed an Orbcomm communications satellite riding piggyback on the rocket, but the launch's primary payload -- a Dragon capsule bound for the International Space Station -- went on to achieve a successful mission.
The upgraded Falcon 9, known as the Falcon 9 v1.1, uses upgraded Merlin 1D engines configured in a circular arrangement dubbed the "octaweb" and employs larger propellant tanks and more redundant avionics systems. It also features a simplified stage separation system, using three attachment points instead of 12, according to SpaceX founder and CEO Elon Musk.
Monday's launch opened a busy calendar of missions planned by SpaceX in 2014.
A mix of missions for NASA and commercial satellites are on SpaceX's docket for this year. Here is a list of Falcon launches that could launch in 2014 after Thaicom 6:
Follow Stephen Clark on Twitter: @StephenClark1.
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