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New Frontiers-Class Missions to the Ice Giants

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New Frontiers-Class Missions to the Ice Giants Planetary Science Vision 2050 Workshop 2017 (LPI Contrib. No. 1989) 8147.pdf NEW FRONTIERS-CLASS MISSIONS TO THE ICE GIANTS. C. M. Elder1, A. M. Bramson2, L. W. Blum3, H. T. Chilton4, A. Chopra5, C. Chu6, A. Das7, A. Davis8, A. Delgado9, J. Fulton8, L. Jozwiak10, A. Khayat3, M. E. Landis2, J. L. Molaro1, M. Slipski8, S. Valencia11, J. Watkins12, C. L. Young4, C. J. Budney1, K. L. Mitchell1, 1Jet Propulsion Laboratory, California Institute of Technology, 2University of Arizona, 3NASA/Goddard Space Flight Center, 4Georgia Institute of Technology, 5University of Washington, 6University of Alaska Fairbanks, 7Purdue Uni- versity, 8University of Colorado at Boulder, 9University of Texas at El Paso, 10Johns Hopkins University/Applied Physics Laboratory, 11Washington University in St. Louis, 12California Institute of Technology Introduction: Ice giants are the least understood changes. Voyager 2 flew past Uranus in 1986, one year class of planets in our solar system. The little data avail- after southern solstice. Uranus’ next southern solstice able for the ice giants come solely from ground-based will occur in 2070. To study the effect of seasons on the observations and the solitary fly-by of the Voyager 2 Uranian system, a mission should arrive at Uranus sig- spacecraft. Unlike gas giants, which are composed pri- nificantly before 2070, preferably close to equinox in marily of hydrogen and helium, ice giants are thought to 2049. Arriving later than 2049 will mean some portions be composed primarily of ices and rocks [1]. However, of the satellites in shadow when Voyager 2 arrived will the phase, distribution, and exact composition of these once again move into shadow until after the next south- ices and rocks are unknown [1]. The magnetic fields of ern solstice in 2070. Uranus and Neptune differ substantially from Jupiter OCEANUS: The 2011 decadal survey [8] suggests and Saturn with their strong quadrupole moments and that the third highest priority Flagship mission in this significant tilt relative to their spin axes [2]. Further- decade should be a mission to an ice giant. We agree more, Uranus and Neptune differ from each other in that while a Flagship mission is preferable, a New Fron- puzzling ways; for example, Uranus has an extremely tiers-class mission could supplement such a mission or high obliquity (98°) [3] and a low heat flux (close to achieve a subset of the science objectives in the event negligible) compared to the similarly sized Neptune [3]. that a Flagship-class mission is not available. We will Neptune has just one large satellite, Triton, which is discuss the New Frontiers-class mission concept thought to be a geologically active captured Kuiper belt OCEANUS: Origins and Composition of the Exoplanet object [4]. Only half of Triton and half of each Uranian Analog Uranus System. OCEANUS is the result of the satellite were imaged by Voyager 2. 2016 Planetary Science Summer School (PSSS) hosted A return to the ice giants is perhaps more important by the Jet Propulsion Laboratory (JPL), California Insti- now than ever before. The Kepler mission has found tute of Technology, which aims to offer participants an that ice giant sized planets are the most commonly ob- authentic but primarily educational experience of the served type of planet [5]. Observational biases are ex- mission proposal process [9]. This exercise resulted in a pected to underreport terrestrial planets; nevertheless, it mission concept for a Uranus orbiter with a limited pay- is striking that ice giants are more common than gas gi- load that would still be able to achieve several of the ants in the Kepler data set. Kepler has also discovered highest priority Decadal Survey goals for Uranus. many super-Earths which are smaller than ice giants but OCEANUS would be an orbiter, which would ena- larger than Earth [5]. Observations show that planets ble a detailed study of the structure of the planet’s mag- larger than 1.6 RÅ are too low density to be comprised netosphere and interior that is not possible with a flyby of iron and silicates alone [6], so perhaps the ice giants mission. The instrument suite would include a magne- in our solar system are the closest analog for these tometer for measurements across the bow shock and newly discovered smaller planets. magnetopause and of temporal variations in the magne- Both the discovery of over a thousand extrasolar ice tosphere. Detailed study of the structure of the magnetic giants and the drive to explore our local solar system field would also constrain models for dynamo genera- necessitate another mission to Uranus and/or Neptune in tion. OCEANUS would also use the on-board commu- the near future. If Uranus is selected, such a mission nications antenna for radio science enabling measure- should be timed to arrive during a different season than ments of Uranus’ global gravity field to degree and or- Voyager 2 to maximize science return. Uranus’ high der six, constraining models for the interior structure of obliquity results in extreme seasonal changes which af- Uranus. Our mission concept would also employ an at- fect several aspects of the Uranus system including: mospheric probe for in situ measurements of noble gas large variations in the intensity of atmospheric dynam- abundances and isotopic ratios as well as temperature ics [7]; half of each satellite in shadow during solstices; and pressure profiles. This simple instrument suite and changes in the interactions between the magneto- would enable OCEANUS to achieve four of the decadal sphere and the solar wind as the angle between them survey’s science objectives for Uranus (including one of the two highest priority objectives). Planetary Science Vision 2050 Workshop 2017 (LPI Contrib. No. 1989) 8147.pdf The parameters for the 2016 PSSS Uranus orbiter tinue development of SEP technology, potentially low- mission included the option to include a “donated” ering the cost, could enable missions to the far-outer so- probe. We decided to include this probe despite the ad- lar system without requiring a Jupiter gravity assist. Al- ditional mass and risk, because it would enable the de- ternatively, more powerful launch vehicles could also termination of noble gas abundances and isotopic ratios. facilitate travel to the outer solar system, but a shorter These were deemed sufficiently important, because they cruise time would result in a faster approach velocity could reveal where in the solar system Uranus formed making orbit insertion more challenging. Continued and constrain solar system formation models, which ground-based observations to characterize the atmos- have not reached a consensus on how far planets mi- pheres of Uranus and Neptune could help to lower the grated since their formation [10]. risk of orbit insertions utilizing aerobraking. Future New Frontiers-Class Missions to Ice Gi- Finally, the notable absence of a dedicated mission ants: In one week at JPL, the graduate students and to an ice giant is felt not just by NASA, but also by ESA postdocs of the 2016 PSSS were unable to develop a [e.g. 12]. The high cost of a mission to the far outer solar mission concept for a Uranus orbiter within the cost system could be shared between NASA and ESA even constraints of a New Frontiers-class mission as sug- on a New Frontiers budget. For example, our gested by the decadal survey; this was due to the high OCEANUS concept included a donated probe from an cost of reaching Uranus within the next few decades and unspecified partner for the purposes of the educational powering the spacecraft while in orbit. With more time exercise, but a mission with a small payload and do- and resources, it is possible that one could develop a vi- nated probe could in fact be a model for a collaboration able mission concept to Uranus or Neptune within a between NASA and ESA, or another space agency. New Frontiers budget, but to achieve a competitive pool Conclusion: Missions to Uranus or Neptune are still of multiple New Frontiers proposals for ice giant mis- very difficult to achieve on a New Frontiers budget, alt- sions, change is necessary. OCEANUS identified three hough OCEANUS showed that, with a highly-focused key areas where advancement could lead to improved mission, current technologies can come close. Contin- mission concepts: power systems, propulsion capabili- ued efforts to develop technologies enabling travel to ties, and cost-sharing collaborations. the outer solar system with the goal of lowering cost Solar power is now sufficiently efficient to power could enable robust New Frontiers-class missions to some missions to distances as far as the Saturnian sys- Uranus and Neptune before 2050. Although an explora- tem [e.g. 11], depending on their operational needs, but tion-based Flagship-class mission analogous to Galileo missions to the far-outer solar system continue to face or Cassini should be a priority, a more focused New power and cost challenges more significant than mis- Frontiers-class mission could achieve a significant frac- sions to the inner and near-outer solar system. For ex- tion of the science objectives highlighted by the decadal ample, OCEANUS would spend over 20% of its budget survey, or could supplement a Flagship mission through on Multi-Mission Radioisotope Thermoelectric Gener- a yet-to-be-determined creative approach galvanized by ators (MMRTGs). These challenges could be amelio- the competitive nature of the New Frontiers program. rated by increased investment by NASA in heat source References: [1] Fortney, J.J., and Nettelmann, N. plutonium production by the Department of Energy, and (2010). SSR, 152(1-4), 423-447. [2] Stevenson, D.J. efforts to lower the cost and/or increase the efficiency (2003). EPSL, 208(1), 1-11.
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