Astro E is a X-ray astronomy satellite bulit as a joint effort of NASA and the Japanese space agency ISAS. Observing the X-ray spectrum of the distant universe, Astro-E was to open a new window into the workings of black holes, neutron stars, active galaxies, and other very energetic objects. Astro E was lost in a launch vehicle failure in February 2000, but a repeat Astro E2 (renamed Suzaku after successful launch) was built to conduct the mission. It was launched in July 2005 aboard a Japanese improved M-5 rocket.
The M-V rocket also called Mu-5 was a Japanese solid-fuel rocket designed to launch scientific satellites.