Galaxy X was the first satellite to be carried on the new Boeing Delta III rocket. The launch occurred on August 26, 1998, but the satellite was lost when the Delta III failed. All Boeing 601- formerly Hughes 601- spacecraft use the same basic bus design, allowing the company to realize efficiencies gained by production volume, tooling investments, and quantity buys. The 601 was introduced in 1987, and it has become the world's best-selling large satellite model. The standard HS 601 model, with silicon solar panels, provides up to 4-5 kilowatts. The 601HP version uses gallium arsenide solar panels and other technological advances to provide as much as 10 kilowatts.