Wikipedia
Superbird-B
Superbird-B, also identified as Superbird-2 before launch, was a geostationary communications satellite designed and manufactured by Ford Aerospace (now SSL MDA) on the SSL 1300 platform. It was originally ordered by Space Communications Corporation (SCC), which later merged into the SKY Perfect JSAT Group. It had a mixed K band, K band and X band payload and was lost at launch.
It was ordered in 1985 along Superbird-A, Superbird-A1 and Superbird-B1 on the very first order of the SSL 1300 platform. It was to be the second satellite of SCC. It was supposed to be used for video distribution, news gathering, remote publishing and high definition TV service to the main islands of Japan and Okinawa from the 162°East position.