Jupiter Europa Orbiter

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Not to be confused with Jovian Europa Orbiter.
Jupiter Europa Orbiter
Europa Jupiter System Mission artist concept.jpg
Montage with JEO
Operator NASA
Mission type Orbiter
Launch date 2020
Launch vehicle Delta IV-H, Ares V or Atlas V
Mission duration cruise period 5-6 years, science period 3 years
Orbital insertion date Proposed: 2025–2026
Homepage ESA Webpage on Laplace/EJSM
Mass 1371 kg
Power MMRTGs
Orbital elements
Semimajor axis 100 km (final orbit around Europa)
Inclination 95°–100° (final orbit around Europa)

As a part of the defunct Europa Jupiter System Mission – Laplace (EJSM/Laplace), the Jupiter Europa Orbiter (JEO) was a proposed orbiter probe slated for lift-off in 2020 and planned for detailed studies of Jupiter's moons Europa and Io as well as the Jovian magnetosphere.[1] Its main goal would have been to look for evidence of a possible subsurface ocean.[2]

In June 2015, a more economical mission, the Europa Multiple-Flyby Mission (Europa Clipper) was approved by NASA and entered the formulation stage.[3] While orbiters like the JEO would be in the $2-$4B range, a multi-flyby spacecraft like the Europa clipper is estimated to cost much less.[4]


  1. ^ "A drop in the bucket is plenty". The National. November 5, 2009. Retrieved 2009-11-08.  |first1= missing |last1= in Authors list (help)
  2. ^ Jupiter Europa Orbiter (JEO) Concept
  3. ^ Howell, Elizabeth (20 June 2015). "NASA's Europa Mission Approved for Next Development Stage" Space.com. Retrieved 2015-06-21.
  4. ^ Kane, Van (26 August 2014). "Europa: How Less Can Be More". Planetary Society. Retrieved 2014-08-29.