Explorer of Enceladus and Titan

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Artist's impression of possible hydrothermal activity on Enceladus PIA19656-SaturnMoon-Enceladus-Ocean-ArtConcept-20150915.jpg
Artist's impression of possible hydrothermal activity on Enceladus
False-color, medium-resolution Cassini synthetic aperture radar mosaic of Titan's north polar region, showing hydrocarbon seas, lakes and tributary networks. Blue coloring indicates low radar reflectivity areas, caused by bodies of liquid ethane, methane and dissolved nitrogen. PIA17655 crop Titan north polar seas and lakes.jpg
False-color, medium-resolution Cassini synthetic aperture radar mosaic of Titan's north polar region, showing hydrocarbon seas, lakes and tributary networks. Blue coloring indicates low radar reflectivity areas, caused by bodies of liquid ethane, methane and dissolved nitrogen.

Explorer of Enceladus and Titan (E2T) is a space mission concept that would investigate the evolution and habitability of the Saturnian satellites Enceladus and Titan and is proposed by the European Space Agency in collaboration with NASA. [2]

Contents

The proposed mission would address key scientific questions regarding extraterrestrial habitability, abiotic/prebiotic chemistry and emergence of life, which are among the highest priorities of ESA's Cosmic Vision program.

Overview

The Explorer of Enceladus and Titan (E2T) orbiter was first proposed in 2017 as a medium-class mission led by the European Space Agency in collaboration with NASA in response to ESA's M5 Cosmic Vision programme. [3]

Both Enceladus and Titan harbour subsurface oceans that are prime environments in which to investigate the conditions for the emergence of life and the habitability potential of ocean worlds as well as the origin and evolution of unique complex planetary systems. [2]

Goals

The E2T mission has three scientific goals: [4]

These goals would be accomplished by measuring the nature, abundance and isotopic properties of solid- and vapor-phase species in Enceladus' plume and Titan's upper atmosphere.

Conceptual payload

The payload would provide in-situ sampling, high-resolution imaging and radio science measurements from multiple flybys of Enceladus and Titan using a solar-electric powered spacecraft in orbit around Saturn. The two main instruments proposed are the Ion and Neutral Gas Mass Spectrometer (INMS) and the Enceladus Icy Jet Analyzer (ENIJA); these high resolution mass spectrometers would provide the data needed to discern the subtle details of the aqueous environment of Enceladus from plume sampling and of the complex pre-biotic chemistry occurring in Titan's atmosphere. [2]

The Titan Imaging and Geology, Enceladus Reconnaissance (TIGER) mid-wave infrared camera would map thermal emission from the plumes and Enceladus' tiger stripes at meter scales and investigate Titan's geomorphology at 50–100 m resolution. [4]

The Radio Science Experiment (RSE) measurements would provide constraints on the ice shell structure and the properties of the internal oceans of Enceladus and Titan. [2]

Propulsion

The spacecraft concept calls for using an ion drive propulsion, proven to be extremely efficient and reliable. An ion thruster —or ion drive— is a form of electric propulsion that creates thrust by accelerating ions with electricity. The required electricity is generated by solar panels mounted on the spacecraft.

See also

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References

  1. Coustenis, A.; Taylor, F. W. (21 July 2008). Titan: Exploring an Earthlike World. World Scientific. pp. 154–155. ISBN   978-981-281-161-5. OCLC   144226016 . Retrieved 2013-12-29.
  2. 1 2 3 4 Mitri, Giuseppe; Postberg, Frank; Soderblom, Jason M.; Tobie, Gabriel; Tortora, Paolo; Wurz, Peter; Barnes, Jason W.; Coustenis, Athena; Ferri, Francesca; Hayes, Alexander; Hayne, Paul O.; Hillier, Jon; Kempf, Sascha; Lebreton, Jean-Pierre; Lorenz, Ralph; Orosei, Roberto; Petropoulos, Anastassios; Yen, Chen-wan; Reh, Kim R.; Schmidt, Jürgen; Sims, Jon; Sotin, Christophe; Srama, Ralf (2017). "Explorer of Enceladus and Titan (E2T): Investigating the habitability and evolution of ocean worlds in the Saturn system". American Astronomical Society. 48. Bibcode:2016DPS....4822501M . Retrieved 2017-09-16.
  3. Mann, Adam (2 May 2017). "Inner Workings: Icy ocean worlds offer chances to find life". Proceedings of the National Academy of Sciences of the United States of America. 114 (18): 4566–4568. Bibcode:2017PNAS..114.4566M. doi: 10.1073/pnas.1703361114 . PMC   5422794 . PMID   28461387.
  4. 1 2 Mitri, Giuseppe; Tobie, Gabriel; Postberg, Frank; Soderblom, Jason M.; Wurz, Peter; Barnes, Jason W.; Berga, Marco; Coustenis, Athena; D'Ottavio, Andrea; Hayes, Alexander G.; Hayne, Paul O.; Lebreton, Jean-Pierre; Lorenz, Ralph D.; Martelli, Andrea; Petropoulos, Anastassios E.; Yen, Chen-wan L.; Reh, Kim R.; Sotin, Christophe; Srama, Ralf; Tortora, Paolo (June 2017). Poster 14: Explorer of Enceladus and Titan (E2T). Titan Aeronomy and Climate. France: NASA. Bibcode:2016tac..confE..26M. Archived from the original on 2021-08-29. Retrieved 2017-09-16.