CAPE CANAVERAL — A sophisticated communications satellite launches into orbit atop an Atlas 5 rocket Sunday to bring residential high-speed Internet to parts of the U.S. that must look to space for connectivity. Getting EchoStar 19 aloft begins with a ride to super-synchronous transfer orbit atop the United Launch Alliance rocket, departing from Cape Canaveral at 1:27 p.m. EST (1827 GMT). The daily launch window extends for exactly two hours. With a thrust-to-weight ratio of 2-to-1, the million-pound rocket will race off the launch pad on two million pounds of thrust and head eastward toward orbit. EchoStar 19 will used by HughesNet to provide its space-to-home Internet service across North America, enabling the expansion of capacity over the existing network and growth in the number of consumers able to be served. From geosynchronous orbit 22,300 miles high, where it will match the Earth’s rotation and remain parked above one spot on the globe, the EchoStar 19 spacecraft will place spotbeams over the areas needing service. A small rooftop-mounted dish sends and receives signals from the satellite, which in turn communicates with ground stations to route websites, streaming video and e-mail to your home computer.