Japanese Lunar Exploration Program

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The (Japanese) Lunar Exploration Program (月探査計画), is a program of robotic and human missions to the Moon undertaken by the Japanese Aerospace Exploration Agency (JAXA), and its division, the Institute of Space and Astronautical Science (ISAS). It is also one of the three major enterprises of the JAXA Space Exploration Center (JSPEC).[1] The main goal of the program is "to elucidate the origin and evolution of the Moon and utilize the Moon in the future".[2]

The first spacecraft of the program, the unmanned lunar orbiter SELENE (Kaguya), was launched from Tanegashima Space Center on September 14, 2007, after being delayed several times. SELENE-2, Japan's first lunar lander and rover, is expected to be launched in 2017.[3] The program also includes an lunar sample return mission (SELENE-3), a mission to Mars, in order to collect data for future manned expeditions (PLANET-X), participation in the Mars international sample return mission, and an advanced lander for future human missions on the Moon (SELENE-X).[2] The eventual goal is to participate in an international lunar outpost program, and have Japanese crews stay on the lunar surface for an long period of time, and promote scientific research, environment utilization.[2]

Completed missions[edit]

SELENE (Kaguya)[edit]

SELENE mission logo.
Main article: SELENE

SELENE (Selenological and Engineering Explorer), nicknamed Kaguya after a lunar princess in the ancient Japanese folklore The Tale of the Bamboo Cutter, is the second Japanese mission to the Moon. Launched in September 2007, it was "the largest lunar mission since the Apollo program".[4] The mission featured three separate space craft, the main orbiter (Kaguya), the small relay satellite (Okina), and the VLBI satellite (Ouna).

Future missions[edit]

SELENE-2[edit]

SELENE-2 lander.
Main article: SELENE-2

SELENE-2, also known as Kaguya-2, formerly known as SELENE-B, is the follow-on mission to Kaguya. SELENE-2 will consist from one large lander, which will have a small-sized rover, and if possible, will also have some penetrators inherited from the LUNAR-A mission, and a small data relay satellite.[5]

SELENE-3[edit]

SELENE-3 aims to return about 100 grams of samples from the Moon surface.[6] It will be launched around 2020. However, due to financial issues JAXA is currently facing, this mission may be merged into the option-3 of SELENE-X.

SELENE-X[edit]

SELENE-X will be launched in the late 2010s, in view of Japan’s participation in Humans Lunar Activities foreseen.[7] The SELENE-X may perform either of the following demonstrations:

  • Option-1:Technology demonstration for building outposts such as the excavation for construction of Infrastructures.
  • Option-2: Logistics capability demonstration for building common landers for both transportation and JAXA’s own robotic missions.
  • Option-3: Highly sophisticated in-situ robotic lander, or returning samples of the surface soil to the Earth, including the development of high speed reentry capsules.

There are other options under study, and will be determined after the international exploration strategy has been clarified.[7]

PLANET-X[edit]

Main article: MELOS

The PLANET-X mission, now known as MELOS (Mars Exploration with Lander-Orbiter Synergy) is a mission to Mars, consisting of an orbiter (MELOS-1), and a lander (MELOS-2). It is the successor to the comet probe Suisei (PLANET-A) the Mars probe Nozomi (PLANET-B), and the Venus probe Akatsuki (PLANET-C). MELOS-1 is planned to be launched in 2018, and will also have up to four small landers.[8][9]

Related missions[edit]

Hiten (MUSES-A)[edit]

Main article: Hiten

Hiten, or MUSES-A (Mu Space Engineering Satellite-A) is a technology demonstration satellite built by ISAS, launched on January 24, 1990.

LUNAR-A[edit]

Main article: Lunar-A

LUNAR-A was an ISAS mission consisting of a lunar space craft which would have carried two penetrators to the Moon, and deploy them at an altitude of 40 km on opposite sides of the lunar body. The penetrators were to have been braked by a small rocket at an altitude of 25 km, then free fall to the surface. They were designed to withstand a collision speed of 330 meters per second to deeply penetrate the lunar regolith. Once the penetrators are deployed, the LUNAR-A spacecraft was mission-planned to maneuver to an orbital altitude of 200 km above the lunar surface. The craft was to have carried a monochromatic imaging camera with a resolution of 30 m. It was to be Japan's first large scale lunar probe. (Hiten was a technology demonstrator and only had a camera and a dust counter)

Not only was LUNAR-A one of the first two missions of the original Lunar Exploration Program, it was supposed to be the first mission in the LUNAR series. However, the mission was delayed for years (the original launch date was in 1995), and from 2004, no launch date was set. The space craft was completed in 1997, but the development of the penetrators were severely delayed. The Project faced several other issues, including problems with the propllant and the thrusters. Worse, in 2006, JAXA decided to retire the M-V rocket, which the LUNAR-A planned to use. M-Ⅴ-2, the rocket which was to be used for LUNAR-A couldn't be used anymore, because many portions of it were reused for other launches. The M-Ⅴ-2 is now displayed in JAXA's Sagamihara Campus.

In January 2007, JAXA cancelled the LUNAR-A mission, mostly due to the fact that the space craft had become old.[10] A follow-on mission known as LUNAR-B existed, but was merged into the SELENE series following LUNAR-A's cancellation. JAXA continued the research for the penetrators, and completed its development in October 2010, following a successful test fire. Russia's Luna-Glob1 plans to use four penetrators provided by JAXA. JAXA is also considering to have the SELENE-2 carry penetrators.[5] Britain's BNSC once stated that they were interested in acquiring several Japanese penetrators for their MoonLITE probe.[11]

SLIM[edit]

SLIM, short for Smart Lander for Investigating Moon, is a candidate for the SPRINT-C (Small scientific satellite Platform for Rapid INvestigation and Test-C) mission.

See also[edit]

References[edit]

  1. ^ JSPEC's Enterprises. Japan Aerospace Exploration Agency.
  2. ^ a b c Lunar Exploration Program. Japan Aerospace Exploration Agency.
  3. ^ "[宇宙開発][はやぶさ2] SSS12 第12回宇宙科学シンポジウム [ISAS/JAXA]" (in Japanese). 
  4. ^ "SELENE: The largest lunar mission since the Apollo program". Retrieved 2008-04-21. 
  5. ^ a b Tatsuaki Hashimoto (May 2006). Robotic Lunar Exploration Scenario (.PDF). JAXA. Retrieved 2010-05-07. 
  6. ^ Lunar Exploration Project SELENE-3:Internal Structure Study and Sample Return (.PDF) (in Japanese). JAXA. 
  7. ^ a b "Rover Missions and Technology for Lunar or Planetary Surface Exploration" (PDF). JAXA. 
  8. ^ MELOS: Japan’s Mars Exploration Plan for 2020’s. MEPAG in Lisbon, Portugal (16–17 June 2011)
  9. ^ "MELOS: Japan’s Mars Exploration Plan ~ Updates on MELOS1 ~" (PDF), MEPAG 2012, Washington D.C.: Japan Aerospace Exploration Agency (JAXA), February 2012, retrieved 2012-10-18 
  10. ^ Makoto Yoshikawa. JAXA Planetary Missions (PDF). JAXA. 
  11. ^ 宇宙開発と国益に関する研究会 (.PDF) (in Japanese). JAXA. 

External links[edit]