Casc Long March 4b

Long March 4B is a three-stage storable-liquid Long March launch vehicle used mainly for SSO and LEO missions.^[1][2] The Long March 4B/4C family is described as a 47 m class, 3.35 m diameter vehicle family, and Long March 4B first flew on 1999-05-10.^[1] Payload figures vary by reference orbit: 2,910 kg to 600 km SSO, 2.65 tonnes to 600 km polar orbit, and 2,200 kg to 700 km SSO.^[1][2] The vehicle remained active as of 2026-06-16; Long March-4B launches occurred in December 2025.^[3]