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Epsilon
Part of J-1 Family
Japanese low-cost solid propellant launch vehicle. Uses the H2A's solid rocket booster SRB-A3 as its first stage. Second stage uses the M-34c solid motor, an improved version of the third stage of the old ISAS M-V rocket. Third stage is the KM-V2b, derived from the KM-V2 kick motor used as the insertion stage for the Hayabusa probe in 2003. Final stage is a new liquid propulsion Post-Boost System (PBS) with 8 x 50N thrusters.

Status: Active. First Launch: 2013-09-14. Last Launch: 2016-12-20. Number: 2 .



Family: all-solid, orbital launch vehicle. Country: Japan. Spacecraft: NEXTAR NX-300L.

2013 September 14 - . 05:00 GMT - . Launch Site: Kagoshima. LV Family: J-1. Launch Vehicle: Epsilon.
  • Hisaki - . Payload: SPRINT A. Mass: 340 kg (740 lb). Nation: Japan. Class: Astronomy. Type: Astronomy satellite. Spacecraft: NEXTAR NX-300L. USAF Sat Cat: 39253 . COSPAR: 2013-049A. Apogee: 1,156 km (718 mi). Perigee: 951 km (590 mi). Inclination: 29.7200 deg. Period: 106.27 min.

    Spectroscopic Planet Observatory for Recognition of Interaction of Atmosphere; carryied a 0.20-meter silicon carbide mirror with an extreme ultraviolet spectrometer observing in the 550 to 1450 Angstrom range, used to study the exospheres of planets in our solar system. First launch of Japan's Epsilon solid propellant launch vehicle.


2016 December 20 - . 11:00 GMT - . Launch Site: Tanegashima. LV Family: J-1. Launch Vehicle: Epsilon.
  • Arase - . Payload: ARASE (ERG). Nation: Japan. Class: Science. Type: Science satellite. USAF Sat Cat: 41896 . COSPAR: 2016-080A. Apogee: 32,259 km (20,044 mi). Perigee: 228 km (141 mi). Inclination: 31.4000 deg.

    Second Epsilon rocket launched the 350 kg ERG geospace science satellite into elliptical orbit. ERG carried experiments to study energetic particles, waves and fields in the magnetosphere. After launch, ERG was renamed 'Arase' (rough water, a metaphor for the dynamic magnetic storms of geospace). The second Epsilon uses a new second stage, the M-35. The first flight in 2013 used a derivative of the M-34 from the old M-V rocket. The M-35, with a mass of 17200 kg, was a growth version sized to match the 2.6m diameter of the larger Epsilon first stage. The third stage was the KM-V2c, with minor improvements compared to the previous mission's KM-V2b. The PBS liquid post-boost 4th stage was not included on this flight.



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