LE-5B-2

Retired JAXA LE-5B-2 expander-bleed cryogenic upper-stage engine, a vibration-reduced LE-5B update for later H-IIA/H-IIB-era missions. JAXA documents multiple in-space ignitions plus idle-mode low-thrust operation for controlled post-mission stage disposal and throttling for higher orbital-insertion accuracy; the canonical H-IIB upper-stage installation and LE-5B derivative lineage are preserved.