May 11 02:37 PM US/Eastern
By MICHAEL WEISSENSTEIN
Associated Press Writer
LONDON (AP) - A TV communications satellite is drifting out of control thousands of miles above the Earth, threatening to wander into another satellite's orbit and interfere with cable programming across the United States, the satellites' owners said Tuesday.
Communications company Intelsat said it lost control of the Galaxy 15 satellite on April 8, possibly because the satellite's systems were knocked out by a solar storm. Intelsat cannot remotely steer the satellite to remain in its orbit, so Galaxy 15 is creeping toward the adjacent path of another TV communications satellite that serves U.S. cable companies.
Galaxy 15 continues to receive and transmit satellite signals, and they will probably interfere with the second satellite, known as AMC 11, if Galaxy 15 drifts into its orbit as expected around May 23, according to AMC 11's owner, SES World Skies.
AMC 11 receives digital programming from cable television channels and transmits it to all U.S. cable networks from its orbit 22,000 miles (36,000 kilometers) above the equator, SES World Skies said. It operates on the same frequencies as Galaxy 15.
"That fact means that there is likely to be some kind of interference," SES World Skies spokesman Yves Feltes told The Associated Press. "Our aim is to bring any interference down to zero."
He would not name any of the cable television channels or providers that could be affected or say how long the interference could last.
Feltes said one option would be using AMC 11's propulsion system to shift that satellite about 60 miles (100 kilometers) away to an orbit that's still within its carefully prescribed "orbital box" but as far away as possible from Galaxy 15.
He said SES had other strategies under consideration but declined to provide details.
"We have all of our technicians, all of our specialists on this case," he said.
Both companies said there was no risk of an actual collision between the two satellites in space.
Intelsat said it was analyzing signals from Galaxy 15 daily in order to predict its trajectory and was trying to figure out if it can shut down the satellite's transmission so it would not interfere with AMC 11.
The company declined to comment on the value of Galaxy 15 but such spacecraft can be worth about $400 million (euro315 million) and cost about the same to launch.
Feltes said the two companies, both based in Luxembourg, were cooperating closely.
"They have tried numerous things to regain control of the satellite or to have it finally shut down," he said. "It needs some collaboration to bring the impact of this failure to an absolute minimum."