Both are communications satellites. Equipped with C-, Ku-, and Ka-band payloads, Star One D1 will be used for telecommunications, television broadcast, broadband, Internet access, and other services in Brazil and in the Latin American region. JCSAT-15 will operate in Ku-band and is designed with the flexibility to be used for services such as video distribution in Japan, and data transfer communications, maritime and aviation applications in the Indian Ocean Region.
Ariane 5 is a heavy-lift launch vehicle, part of the Ariane rocket family.
Arianespace SA is a multinational company founded in 1980 as the world's first commercial launch service provider. It undertakes the production, operation, and marketing of the Ariane programme. Their vehicles launch exclusively from French Guiana in South America.INFO WIKI