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日本宇宙开发事业团计划采用俄罗斯和美国的现有技术来改进其最近取消了的昂贵的Ｊ１火箭。拟议中的Ｊ１替代火箭原来称作Ｊ１改进型火箭或Ｊ２火箭，最近重新命名为先进技术验证火箭（ＡｄｖａｎｃｅｄＴｅｃｈｎｏｌｏｇｙＰｒｏｖｉｎｇＲｏｃｋｅｔ）。宇宙开发事业团政策
Japan’s Space Development Agency plans to use existing technologies from Russia and the United States to improve its recently canceled expensive J1 rockets. The proposed J1 replacement rocket, originally known as the J1 Modified Rocket or J2 Rockets, was recently renamed Advanced Technology Projection Rocket. Space Development Group policy