Celestia deploys satellites and performs experiments (STS-41-D)
12In this video, Celestia lifts off with 3 satellites: SBS-4 for Satellite Business Systems, Telstar 302 for AT&T, and Syncom IV-2, or Leasat-2, a Hughes-built satellite leased to the U.S. Navy.
Another payload was the OAST-1 solar array, a device 4 m (13 ft) wide and 31 m (102 ft) high, which folded into a package 18 cm (7.1 in) deep. The array carried a number of different types of experimental solar cells and was extended to its full height several times during the mission. At the time, it was the largest structure ever extended from a crewed spacecraft, and it demonstrated the feasibility of large lightweight solar arrays for use on future orbital installations, such as the International Space Station (ISS).
The McDonnell Douglas-sponsored Continuous Flow Electrophoresis System (CFES) experiment, using living cells, was more elaborate than the one flown on previous missions, and payload specialist Walker operated it for more than 100 hours during the flight. A student experiment to study crystal growth in microgravity was also carried out. The highlights of the mission were filmed using an IMAX motion picture camera, and later appeared in the 1985 documentary film The Dream is Alive. On September 3, 1984, concern arose over the formation of ice on the waste dump nozzle of the shuttle. The cause was an obstruction in the shuttle's external wastewater dumping system that caused a 61 cm (24 in) "pee-sicle" to form during the mission; Hartsfield removed it with the Remote Manipulator System (Canadarm) the following day.