Japanese navigation satellite Michibiki-4 will operate under QZSS (Quasi Zenith Satellite System). Satellite was built on Mitsubishi DS-2000 bus and weighs 4700 kg. It will operate at least 15 years from GEO orbit. Satellite will be launched on the top of the H-IIA rocket from Tanegashima Space Center. It is second Michibiki satellite delivered to orbit in 2017 and fourth in total. JAXA, operator of QZSS considers extending constellation to seven spacecraft in following years, but with fourth satellite system will become fully operational.