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Epsilon

Epsilon CLPS (SPRINT A) [JAXA]

Epsilon (2) (ERG) [JAXA]

Epsilon (2) CLPS (ASNARO 2) [JAXA]

The Epsilon (designated Advanced Solid Rocket during development) is the replacement for the M-5 rocket.

The initial configuration, Epsilon, featured the SRB-A3 Booster of the H-2A as first stage and the M-34c and KM-V2b stages of M-5 heritage as second and third stages. Two SMSJ ( Solid Motor Side Jet) are added to the SRB-A motor for roll control. Optionally, a liquid fueled fourth stage (CLPS, Compact Liquid Propulsion Stage) can be carried. It will be capable to put about 1200 kg into low earth orbit (3 stage) or 450 kg into a sun synchronous orbit (4 stage). The focus in development will be on streamlining the launch procedures and reducing the costs.

Beginning with the second flight, it was replaced by the improved Epsilon (2) (Enhanced Epsilon), which features the larger M-35 stage 2 and a modified stage 3 KM-V2c, which both have non-extending nozzles to improve performance and to simplify the vehicle.

The new rocket had its maiden flight in 2013.

Version Stage 1 Stage 2 Stage 3 Stage 4
Epsilon SRB-A3 M-34c KM-V2b -
Epsilon CLPS SRB-A3 + 2 × SMSJ M-34c KM-V2b CLPS
Epsilon (2) (Enhanced Epsilon) SRB-A3 + 2 × SMSJ M-35 KM-V2c -
Epsilon (2) imp. CLPS (Enhanced Epsilon imp. CLPS) SRB-A3 + 2 × SMSJ M-35 KM-V2c imp. CLPS (PBS)
Epsilon-S SRB-3 + 2 × SMSJ M-35 ? ? PBS
Performance (kg) LEO LPEO SSO GTO GEO MolO IP
Epsilon 1200 - - - - - -
Epsilon CLPS 700 - 450 - - - -
Epsilon (2) (Enhanced Epsilon) 1500 - - - - - -
Epsilon (2) imp. CLPS (Enhanced Epsilon imp. CLPS) - 590 - - - -
Epsilon-S 1400 - 600 - - - -
No:     Serial: Type:                   Serial:  Date:         LS         Payload

 1       1      Epsilon CLPS            F01      14.09.2013    Ka LP-M    EXCEED (SPRINT A)
 2       1      Epsilon (2)             F02      20.12.2016    Ka LP-M    ERG (SPRINT B)
 3       1      Epsilon (2) CLPS        F03      17.01.2018    Ka LP-M    ASNARO 2
 4       2      Epsilon (2) CLPS        F04      18.01.2019    Ka LP-M    RAPIS 1 / ALE 1 / Hodoyoshi 2 / MicroDragon / OrigamiSat 1 / AOBA-VELOX 4 / NEXUS
 

Planned:

 x       3      Epsilon-S               F10      xx.xx.2023    Ka LP-M    DESTINY+
 x       1      Epsilon-S               F08      xx.xx.2023    Ka LP-M    LOTUSat 1
 x       4      Epsilon-S               F11      xx.xx.2026    Ka LP-M    Solar C (EUVST)
 x       3      Epsilon (2) CLPS        F05      xx.xx.2021    Ka LP-M    RAISE 2 / Hibari / Z-Sat / DRUMS / ASTERISC / ARICA / NanoDragon 1 / KOSEN 1
 x       4      Epsilon (2) CLPS        F06      xx.xx.2021    Ka LP-M    RAISE 3 / ?
 x       2      Epsilon-S               F09      xx.xx.2023    Ka LP-M    RAISE 4 / ?
 x       5      Epsilon-S               F12      xx.xx.2026    Ka LP-M    RAISE 5 / ?
 x       5      Epsilon (2) CLPS        F07      xx.xx.2023    Ka LP-M    Small-JASMINE
 

Ka  = Kagoshima Space Center / Uchinoura Space Center, Kagoshima, Kyushu, Japan Japan