Encyclopedia Astronautica
H-II (2S)


Japanese orbital launch vehicle. Three stage version consisting of 2 x H-II SSB boosters + 2 x H-II SRB boosters + core vehicle.

Payload: 3,930 kg (8,660 lb) to a GTO.

Gross mass: 281,000 kg (619,000 lb).
Payload: 3,930 kg (8,660 lb).
Height: 49.00 m (160.00 ft).
Diameter: 4.00 m (13.10 ft).
Thrust: 4,600.00 kN (1,034,100 lbf).
Apogee: 40,000 km (24,000 mi).

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Associated Countries
See also
  • H-2 Heavy lift Japanese indigenous launch vehicle. The original H-2 version was cancelled due to high costs and poor reliability and replaced by the substantially redesigned H-2A.

    3 stage vehicle consisted of 2 x H-II SRB + 1 x H-II stage 1 + 1 x H-II stage 2 More...


Associated Manufacturers and Agencies
  • Mitsubishi Japanese manufacturer of rockets, spacecraft, and rocket engines. Mitsubishi Electric Corp, Japan. More...

Associated Stages
  • H-2-0 Solid propellant rocket stage. Loaded/empty mass 70,400/11,250 kg. Thrust 1,540.00 kN. Vacuum specific impulse 273 seconds. More...
  • H-2-1 Lox/LH2 propellant rocket stage. Loaded/empty mass 98,100/11,900 kg. Thrust 1,078.00 kN. Vacuum specific impulse 446 seconds. More...
  • H-2A SSB Solid propellant rocket stage. Loaded/empty mass 15,200/2,100 kg. Thrust 626.60 kN. Vacuum specific impulse 283 seconds. Provides supplemental thrust for H-2 or H-2A. More...
  • LE-5EC Lox/LH2 propellant rocket stage. Loaded/empty mass 16,700/2,700 kg. Thrust 121.50 kN. Vacuum specific impulse 452 seconds. More...

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