OMOTENASHI

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OMOTENASHI
NamesOutstanding MOon exploration TEchnologies demonstrated by NAno Semi-Hard Impactor
Mission typeTechnology demonstrator, Reconnaissance
OperatorJAXA
Websitewww.isas.jaxa.jp/home/omotenashi/index.html
Spacecraft properties
SpacecraftOMOTENASHI
Spacecraft typeCubeSat
Bus6U CubeSat
ManufacturerJAXA
Launch mass14 kg (31 lb)
Dimensions10 cm × 20 cm × 30 cm
Power30 watts [1]
Start of mission
Launch dateNovember 2021 (planned) [2]
RocketSLS Block 1
Launch siteKennedy, LC-39B
ContractorNASA
Orbital parameters
Reference systemSelenocentric orbit
Moon impactor
Spacecraft componentOrbiter and lander
Transponders
BandX-band, S-band, P-band [3][1]
Instruments
Radiation monitor
Accelerometer
 

OMOTENASHI (Outstanding MOon exploration TEchnologies demonstrated by NAno Semi-Hard Impactor) is a small spacecraft and semi-hard lander of the 6U CubeSat format that will demonstrate low-cost technology to land and explore the lunar surface. The CubeSat will also take measurements of the radiation environment near the Moon as well as on the lunar surface. Omotenashi is a Japanese word for "welcome" or "Hospitality".[1][4]

OMOTENASHI will be one of thirteen CubeSats to be carried with the Artemis 1 mission into a heliocentric orbit in cislunar space on the maiden flight of the Space Launch System (SLS), scheduled to launch in 2021.[2]

Overview[edit]

The OMOTENASHI mission will land the smallest lunar lander to date on the lunar surface to demonstrate the feasibility of the hardware for distributed synergistic exploration system with multi-point exploration. Once on the lunar surface, the OMOTENASHI lander will observe the radiation environment of the lunar surface. The OMOTENASHI orbiter and lander were designed by the Japan Aerospace Exploration Agency (JAXA). It is a 6U CubeSat measuring 10 cm × 20 cm × 30 cm, and has a mass of 14 kg (31 lb). The principal investigator is Tatsuaki Hashimoto from JAXA.[5] The spacecraft features two deployable solar panels and lithium ion batteries. After measuring the radiation environment as it approaches the Moon, OMOTENASHI's lander module will perform a semi-hard landing on the lunar surface.[6]

Payload[edit]

The lander's scientific payload consist on a radiation monitor and an accelerometer.[1]

Propulsion and landing[edit]

OMOTENASHI uses a cold gas thruster to enter a lunar-impact orbit, and a solid rocket motor for the landing phase.[3] The entry and landing phases will be informed by the use of an X-band two-way Doppler.[3] The orbiting module will enter at a shallow flight-path angle of ≤7°, and it will be ejected when the solid rocket burn begins the deceleration maneuvre.[3] The rocket will be ignited with a laser.[1][7] After the deceleration rocket burn that will last 15-20 seconds,[7] OMOTENASHI's lander will eject the retrorocket, experiencing a free-fall of about 100 m. Just before impact, the lander will deploy a single airbag about 50 cm in diameter to minimize the impact,[7][8] estimated to be at 20 - 30 m/s.[1][3]

Spacecraft
components [7][3]
Units/performance
Modules * Orbiting module
* Retro motor Module
* Surface probe
Surface probe 0.7 kg [8]
Battery: 30 Wh
Consumption: 15 W
Orbiter 7 kg
(including cold gas system)
Propulsion * Solid motor: 6 kg (2500 m/s) - includes solid fuel
* Cold gas jet: (N2, 20 m/s)

See also[edit]

The 13 CubeSats flying in the Artemis 1 mission

References[edit]

  1. ^ a b c d e f "OMOTENASHI" (PDF). JAXA. 29 October 2016. Retrieved 10 March 2021.
  2. ^ a b Grush, Loren (22 January 2020). "NASA administrator on the year ahead: "a lot of things have to go right"". THE VERGE. Retrieved 10 March 2021.
  3. ^ a b c d e f "Trajectory Design for the JAXA Moon Nano-Lander OMOTENASHI". Digital Commons. 2017. Retrieved 10 March 2021.
  4. ^ "Go To MOON! The World's Smallest Moon Lander: OMOTENASHI" (PDF). JAXA. 2017. Retrieved 12 March 2021.
  5. ^ "International Partners Provide Science Satellites for America's Space Launch System Maiden Flight". NASA. 26 May 2016. Retrieved 10 March 2021. This article incorporates text from this source, which is in the public domain.
  6. ^ "International Partners To Launch CubeSats On Orion Exploration Mission-1". Colaorado Space News. 26 May 2016. Retrieved 10 March 2021.
  7. ^ a b c d "OMOTENASHI" (PDF). JAXA. 2017. Retrieved 10 March 2021.
  8. ^ a b "OMOTENASHI - Mission Sequence". JAXA. 2017. Retrieved 12 March 2021.

External links[edit]