RAISE-3 (RApid Innovative payload demonstration SatellitE-3) is asmallsat for technology demonstration developed byMitsubishi Heavy Industries (MHI). Part of the Japanese space agencyJAXA'sInnovative Satellite Technology Demonstration Program, RAISE-3 carried multiple technologies that were selected for in-orbit demonstration. RAISE-3 was launched on 12 October 2022 by anEpsilon rocket as the main satellite of Innovative Satellite Technology Demonstration-3, but the launch resulted in a failure and the satellite was lost.[1]
For developing RAISE-3, JAXA selected MHI, the prime contractor of Japan'sH-IIA andH3 rockets. MHI also previously developed Z-Sat, a satellite launched in 2021 as part of theInnovative Satellite Technology Demonstration-2 mission.[2] While in orbit, RAISE-3 would have been operated from MHI's Nagoya Guidance & Propulsion Systems Works plant inKomaki, Aichi.[2] The satellite carried 7 of the 15 themes that will be tested in Innovative Satellite Technology Demonstration-3.
GEMINI, developed byMitsubishi Electric (MELCO) is a device that includes acommercial off-the-shelfgraphics processing unit (COTS GPU). GEMINI hasSAR images preinstalled to replicate a typicalEarth observation satellite, and the GPU will format and process the image in orbit before sending it to aground station.[3] The main goal of GEMINI is to test how a consumer-grade GPU performs in space.[4] During development, recently recruited engineers at MELCO were charged with the designing and testing of the device.[4]
KIR is awater based hybrid thruster that consists of four resistojet thrusters and a singleion thruster, fed by the same water tank. The resistojet thrusters have a lowspecific impulse but can produce a large thrust for a short time period. On the other hand, the ion thruster is fuel-efficient but cannot produce a large thrust in a short time period. The two types of thrusters are complimentary, and by combining them KIR can provide a wide variety of thrust capabilities.[5] KIR is sized to fit inside a CubeSat. An external camera monitors the operation of the ion thruster.[6] KIR was developed by Pale Blue, a company that produces a series of thrusters for use in smallsats, all using water as fuel. The company claims that the use of water, instead of toxic alternatives will lead to the sustainable development of space.[5]
D-SAIL is a deployablesail that uses its large surface area to generate friction with the atmosphere and decrease theorbital speed of the satellite, which allows it to lower altitude, ultimately leading to the satellite's deorbiting andentering Earth's atmosphere.[7] D-SAIL was developed byAxelspace Corporation [ja].
Launches are separated by dots ( • ), payloads by commas ( , ), multiple names for the same satellite by slashes ( / ). Crewed flights are underlined. Launch failures are marked with the † sign. Payloads deployed from other spacecraft are (enclosed in parentheses).
