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The Jupiter Magnetospheric Orbiter (木星磁気圏オービター, JMO) is a cancelled space probe proposed by the Japanese Aerospace Exploration Agency (JAXA), to undertake detailed in situ studies of the magnetosphere of Jupiter as a template for an astrophysical magnetised disk.

History

The JMO was originally proposed in 2006 as the Japanese contribution to the now cancelled Europa Jupiter System Mission (EJSM). Then, it was proposed to be carried to Jupiter by the Jupiter and Trojan Asteroid Explorer (Trojan Asteroid Explorer).

The discussion for the international collaboration for a Jupiter mission between ESA and Japan (JAXA) started in 2006. By 2007, the orbiter was proposed for a lift-off in 2020 together with ESA's Jupiter Ganymede Orbiter (JGO) from which it would undock upon its arrival at Jupiter in 2025/2026. However, the EJSM collaboration was disbanded and NASA renamed its initiative with Europa Multiple-Flyby Mission, ESA's Jupiter Icy Moon Explorer, and Roscosmos's Laplace-P.

The JMO objective was to undertake detailed in situ studies of the magnetosphere of Jupiter as a template for an astrophysical magnetised disk for "3-point" investigations of the Jupiter system via synergistic observations with other orbiters. The size and weight of the JMO would have been limited to carry a payload up to 10 kg, equivalent to 2 to 3 scientific instruments. In order to conduct observations never made before, the spacecraft would have carried an X-ray imaging spectroscope, featuring different wavelengths from instruments onboard NASA's Juno probe.

In November 2013, Japan's JAXA scientists stated that ″it is difficult for JAXA to launch the outer planet mission by itself to meet the time constraint for cooperative observation with JUICE. Therefore, direct collaboration with European groups/team should be necessary for Japanese scientists to participate in this attractive Jupiter system mission.″ The outcome was the selection of four Japanese instrument development teams for 4 of the 10 Jupiter Icy Moon Explorer (JUICE) mission instruments.

See also

• Magnetometer (Juno)

References

1. ^ Exploration of Jovian System by ESA-JUICE Mission: Participation of Japanese Teams. International Astrobiology Workshop 2013. November 28–30, 2013. Sagamihara, Kanagawa, Japan.
2. Sasaki, S.; Fujimoto, M.; Yano, H.; Takashima, T.; Kasaba, Y.; Takahashi, Y.; Kimura, J.; Funase, R.; Mori, O.; Tsuda, Y.; Campagnola, S.; Kawakatsu, Y. (2011). "Japanese mission plan for Jupiter system: The Jupiter magnetospheric orbiter and the Trojan asteroid explorer" (PDF). Epsc-Dps2011-1091. 6: 1091. Bibcode:2011epsc.conf.1091S. Retrieved January 14, 2023.
3. JMO - Orbit and Operation Archived 2017-09-29 at the Wayback Machine (2008)
4. Vulpetti, Giovanni; Johnson, Les; Matloff, Gregory L. (2015). "New Projects in Progress". Solar Sails. pp. 179–186. doi:10.1007/978-1-4939-0941-4_17. ISBN 978-1-4939-0940-7.
5. "LAPLACE - A mission to Europa and the Jupiter System for ESA's Cosmic Vision Programme" (PDF). Archived from the original (PDF) on 2016-03-05. Retrieved 2015-08-27.
6. "Microsoft PowerPoint - 木星セイル201101" (PDF). Archived from the original (PDF) on 2014-05-14. Retrieved 2012-05-31.

v t e Spacecraft missions to Jupiter
Flybys	Pioneer program Pioneer 10 11 Voyager program Voyager 1 2 Ulysses Cassini–Huygens New Horizons
Orbiters	Galileo Juno (active)
Atmospheric probes	Galileo Probe
En route	Jupiter Icy Moons Explorer (JUICE) (2023, insertion 2031) Europa Clipper (2024, insertion 2030)
Planned missions	Tianwen-4 (2029, insertion 2035)
Proposed missions	Shensuo (2020s) Europa Lander (2025) Interstellar Probe (2036)
Cancelled or not developed	Argo Europa Jupiter System Mission-Laplace Jupiter Europa Orbiter Jupiter Ganymede Orbiter Jupiter Magnetospheric Orbiter Europa Orbiter FIRE Innovative Interstellar Explorer Io Volcano Observer Jovian Europa Orbiter Jupiter Icy Moons Orbiter Laplace-P New Horizons 2 OKEANOS Pioneer H SMARA Trident Tsiolkovsky mission
Related topics	Exploration of Jupiter Atmosphere of Jupiter Magnetosphere of Jupiter Moons of Jupiter Io Exploration Europa Ganymede Callisto Rings of Jupiter Deep Space Network Missions to outer planets Colonization of the outer Solar System
Missions are ordered by launch date. Sign indicates failure en route or before intended mission data returned. indicates use of the planet as a gravity assist en route to another destination.

• Japanese space probes
• Cancelled spacecraft
• Missions to Jupiter
• Europa Jupiter System Mission – Laplace