JCSAT-1B, known as JCSAT-5 before launch, is a geostationary communications satellite operated by SKY Perfect JSAT Group (JSAT) which was designed and manufactured by Hughes (now Boeing) on the HS-601 satellite bus. It has a pure Ku-band payload and was used to replace JCSAT-1 at the 150° East longitude. It covers Japan, Korea, most of China, Thailand, Vietnam, Laos, part of Indonesia, part of Malaysia and Hawaii.