 An artist's impression of NASA'sEuropa Orbiter above the surface of Jupiter's moon, Europa | |
| Mission type | Europa orbiter |
|---|---|
| Operator | NASA |
| Mission duration | Cancelled |
| Spacecraft properties | |
| Launch mass | 900 kg (2,000 lb) |
| Start of mission | |
| Launch date | 2003 |
| Rocket | Space Shuttle |
| Europa orbiter | |
| Orbital insertion | 2007 (proposed) |
Large Strategic Science Missions Planetary Science Division | |
TheEuropa Orbiter[1] was a plannedNASA mission toJupiter's MoonEuropa, that was cancelled in 2002.[2] Its main objectives included determining the presence or absence of a subsurface ocean and identifying candidate sites for future lander missions.[3] Europa Orbiter received pre-project funding in 1998, and resulted from NASA's Fire and Ice project.[3]
Europa Orbiter was a design for a mission to the Jovian moon Europa, based on a 900 kg (2,000 lb) orbiter, of which 500 kg (1,100 lb) was fuel for maneuvers.[4] It would have been powered byRadioisotope thermoelectric generator (RTG) power and launched from theSpace Shuttle in 2003.[4] This would have meant an arrival at Jupiter in 2007, at which time it would commence in a three-part science tour focused on Europa.[4] The spacecraft would be radiation hardened to survive a predicted 4megarads of radiation.[4]
The science payload would include a radar to determine the thickness of ice at Europa, and determine what was below it.[5] Other instruments would be analtimeter and imaging systems, among other devices.[6]
In 1999, NASA issued an announcement of opportunity that solicited experiments for Europa Orbiter,Pluto Kuiper Express, andParker Solar Probe.[4]
The results of the studies on the Europa Orbiter have been conducive to theJupiter Europa Orbiter (JEO), NASA's contribution to the planned internationalEuropa Jupiter System Mission (EJSM) that was slated for launch in 2020. EJSM was cancelled in 2011.
The Europa Orbiter-concept should not be confused with theJovian Europa Orbiter, a feasibility study conducted by theEuropean Space Agency (ESA) which was finally superseded by the EJSM, too.
Another Europa mission in this era was theEuropa Ice Clipper, aStardust mission-like sample return mission.[5]
The next NASA mission to Jupiter wasJuno, which was selected in 2005 as the next New Frontiers mission afterNew Horizons.[7] It was launched in 2011 and arrived at Jupiter in the summer of 2016.
A 2002 paper noted the following challenges for this mission: "substantial energy required for a direct trajectory, the long duration of the mission, the high total-radiation dose, and the need for radioisotope thermoelectric generators".[8] One mission plan involved first entering Jovian orbit, then use multiple gravity assists from theMoons of Jupiter to help it to enter the orbit of Europa with less rocket fuel.[9]
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Later in the 21st century, it was suggested the goal of the Europa Orbiter should have been to find places where the freshest sub-surface material had been brought to the surface.[10] This location would then be the target of a lander which could study what would hopefully be subsurface material, without having to drill down through the ice layer.[11]
Another aspect that has been noted was that this concept was studied about three years leading up to its cancellation in 2002.[11] AfterEuropa Orbiter, NASA turned its attention to a nuclear fission powered orbiter for Europa forProject Prometheus.[11]
Comparison of notional NASA missions targeting Jupiter's moon Europa.
| Name | Time Period | Power | Launcher |
|---|---|---|---|
| Europa Orbiter | 1999–2002 | RTG | Space Shuttle |
| Jupiter Icy Moons Orbiter | 2004–2005 | Fission | Delta IV Heavy |
| Jupiter Europa Orbiter (EJSM ) | 2008–2011 | RTG | Delta IV Heavy,Atlas V, etc. |
| Europa Clipper | 2015– | Solar | Falcon Heavy |
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This article incorporates text from this source, which is in thepublic domain. This article incorporates text from this source, which is in thepublic domain. This article incorporates text from this source, which is in thepublic domain.| Flybys |  | |
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Missions are ordered by launch date. Sign† indicates failure en route or before intended mission data returned.‡ indicates use of the planet as agravity assist en route to another destination. | ||
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