46 ESLAB Symposium Formation and Evolution of Moons Abstract Book
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The Geology of the Rocky Bodies Inside Enceladus, Europa, Titan, and Ganymede
49th Lunar and Planetary Science Conference 2018 (LPI Contrib. No. 2083) 2905.pdf THE GEOLOGY OF THE ROCKY BODIES INSIDE ENCELADUS, EUROPA, TITAN, AND GANYMEDE. Paul K. Byrne1, Paul V. Regensburger1, Christian Klimczak2, DelWayne R. Bohnenstiehl1, Steven A. Hauck, II3, Andrew J. Dombard4, and Douglas J. Hemingway5, 1Planetary Research Group, Department of Marine, Earth, and Atmospheric Sciences, North Carolina State University, Raleigh, NC 27695, USA ([email protected]), 2Department of Geology, University of Georgia, Athens, GA 30602, USA, 3Department of Earth, Environmental, and Planetary Sciences, Case Western Reserve University, Cleveland, OH 44106, USA, 4Department of Earth and Environmental Sciences, University of Illinois at Chicago, Chicago, IL 60607, USA, 5Department of Earth & Planetary Science, University of California Berkeley, Berkeley, CA 94720, USA. Introduction: The icy satellites of Jupiter and horizontal stresses, respectively, Pp is pore fluid Saturn have been the subjects of substantial geological pressure (found from (3)), and μ is the coefficient of study. Much of this work has focused on their outer friction [12]. Finally, because equations (4) and (5) shells [e.g., 1–3], because that is the part most readily assess failure in the brittle domain, we also considered amenable to analysis. Yet many of these satellites ductile deformation with the relation n –E/RT feature known or suspected subsurface oceans [e.g., 4– ε̇ = C1σ exp , (6) 6], likely situated atop rocky interiors [e.g., 7], and where ε̇ is strain rate, C1 is a constant, σ is deviatoric several are of considerable astrobiological significance. stress, n is the stress exponent, E is activation energy, R For example, chemical reactions at the rock–water is the universal gas constant, and T is temperature [13]. -
JUICE Red Book
ESA/SRE(2014)1 September 2014 JUICE JUpiter ICy moons Explorer Exploring the emergence of habitable worlds around gas giants Definition Study Report European Space Agency 1 This page left intentionally blank 2 Mission Description Jupiter Icy Moons Explorer Key science goals The emergence of habitable worlds around gas giants Characterise Ganymede, Europa and Callisto as planetary objects and potential habitats Explore the Jupiter system as an archetype for gas giants Payload Ten instruments Laser Altimeter Radio Science Experiment Ice Penetrating Radar Visible-Infrared Hyperspectral Imaging Spectrometer Ultraviolet Imaging Spectrograph Imaging System Magnetometer Particle Package Submillimetre Wave Instrument Radio and Plasma Wave Instrument Overall mission profile 06/2022 - Launch by Ariane-5 ECA + EVEE Cruise 01/2030 - Jupiter orbit insertion Jupiter tour Transfer to Callisto (11 months) Europa phase: 2 Europa and 3 Callisto flybys (1 month) Jupiter High Latitude Phase: 9 Callisto flybys (9 months) Transfer to Ganymede (11 months) 09/2032 – Ganymede orbit insertion Ganymede tour Elliptical and high altitude circular phases (5 months) Low altitude (500 km) circular orbit (4 months) 06/2033 – End of nominal mission Spacecraft 3-axis stabilised Power: solar panels: ~900 W HGA: ~3 m, body fixed X and Ka bands Downlink ≥ 1.4 Gbit/day High Δv capability (2700 m/s) Radiation tolerance: 50 krad at equipment level Dry mass: ~1800 kg Ground TM stations ESTRAC network Key mission drivers Radiation tolerance and technology Power budget and solar arrays challenges Mass budget Responsibilities ESA: manufacturing, launch, operations of the spacecraft and data archiving PI Teams: science payload provision, operations, and data analysis 3 Foreword The JUICE (JUpiter ICy moon Explorer) mission, selected by ESA in May 2012 to be the first large mission within the Cosmic Vision Program 2015–2025, will provide the most comprehensive exploration to date of the Jovian system in all its complexity, with particular emphasis on Ganymede as a planetary body and potential habitat. -
An Impacting Descent Probe for Europa and the Other Galilean Moons of Jupiter
An Impacting Descent Probe for Europa and the other Galilean Moons of Jupiter P. Wurz1,*, D. Lasi1, N. Thomas1, D. Piazza1, A. Galli1, M. Jutzi1, S. Barabash2, M. Wieser2, W. Magnes3, H. Lammer3, U. Auster4, L.I. Gurvits5,6, and W. Hajdas7 1) Physikalisches Institut, University of Bern, Bern, Switzerland, 2) Swedish Institute of Space Physics, Kiruna, Sweden, 3) Space Research Institute, Austrian Academy of Sciences, Graz, Austria, 4) Institut f. Geophysik u. Extraterrestrische Physik, Technische Universität, Braunschweig, Germany, 5) Joint Institute for VLBI ERIC, Dwingelo, The Netherlands, 6) Department of Astrodynamics and Space Missions, Delft University of Technology, The Netherlands 7) Paul Scherrer Institute, Villigen, Switzerland. *) Corresponding author, [email protected], Tel.: +41 31 631 44 26, FAX: +41 31 631 44 05 1 Abstract We present a study of an impacting descent probe that increases the science return of spacecraft orbiting or passing an atmosphere-less planetary bodies of the solar system, such as the Galilean moons of Jupiter. The descent probe is a carry-on small spacecraft (< 100 kg), to be deployed by the mother spacecraft, that brings itself onto a collisional trajectory with the targeted planetary body in a simple manner. A possible science payload includes instruments for surface imaging, characterisation of the neutral exosphere, and magnetic field and plasma measurement near the target body down to very low-altitudes (~1 km), during the probe’s fast (~km/s) descent to the surface until impact. The science goals and the concept of operation are discussed with particular reference to Europa, including options for flying through water plumes and after-impact retrieval of very-low altitude science data. -
The Subsurface Habitability of Small, Icy Exomoons J
A&A 636, A50 (2020) Astronomy https://doi.org/10.1051/0004-6361/201937035 & © ESO 2020 Astrophysics The subsurface habitability of small, icy exomoons J. N. K. Y. Tjoa1,?, M. Mueller1,2,3, and F. F. S. van der Tak1,2 1 Kapteyn Astronomical Institute, University of Groningen, Landleven 12, 9747 AD Groningen, The Netherlands e-mail: [email protected] 2 SRON Netherlands Institute for Space Research, Landleven 12, 9747 AD Groningen, The Netherlands 3 Leiden Observatory, Leiden University, Niels Bohrweg 2, 2300 RA Leiden, The Netherlands Received 1 November 2019 / Accepted 8 March 2020 ABSTRACT Context. Assuming our Solar System as typical, exomoons may outnumber exoplanets. If their habitability fraction is similar, they would thus constitute the largest portion of habitable real estate in the Universe. Icy moons in our Solar System, such as Europa and Enceladus, have already been shown to possess liquid water, a prerequisite for life on Earth. Aims. We intend to investigate under what thermal and orbital circumstances small, icy moons may sustain subsurface oceans and thus be “subsurface habitable”. We pay specific attention to tidal heating, which may keep a moon liquid far beyond the conservative habitable zone. Methods. We made use of a phenomenological approach to tidal heating. We computed the orbit averaged flux from both stellar and planetary (both thermal and reflected stellar) illumination. We then calculated subsurface temperatures depending on illumination and thermal conduction to the surface through the ice shell and an insulating layer of regolith. We adopted a conduction only model, ignoring volcanism and ice shell convection as an outlet for internal heat. -
3.1 Discipline Science Results
CASSINI FINAL MISSION REPORT 2019 1 SATURN Before Cassini, scientists viewed Saturn’s unique features only from Earth and from a few spacecraft flybys. During more than a decade orbiting the gas giant, Cassini studied the composition and temperature of Saturn’s upper atmosphere as the seasons changed there. Cassini also provided up-close observations of Saturn’s exotic storms and jet streams, and heard Saturn’s lightning, which cannot be detected from Earth. The Grand Finale orbits provided valuable data for understanding Saturn’s interior structure and magnetic dynamo, in addition to providing insight into material falling into the atmosphere from parts of the rings. Cassini’s Saturn science objectives were overseen by the Saturn Working Group (SWG). This group consisted of the scientists on the mission interested in studying the planet itself and phenomena which influenced it. The Saturn Atmospheric Modeling Working Group (SAMWG) was formed to specifically characterize Saturn’s uppermost atmosphere (thermosphere) and its variation with time, define the shape of Saturn’s 100 mbar and 1 bar pressure levels, and determine when the Saturn safely eclipsed Cassini from the Sun. Its membership consisted of experts in studying Saturn’s upper atmosphere and members of the engineering team. 2 VOLUME 1: MISSION OVERVIEW & SCIENCE OBJECTIVES AND RESULTS CONTENTS SATURN ........................................................................................................................................................................... 1 Executive -
Enceladus, Moon of Saturn
National Aeronautics and and Space Space Administration Administration Enceladus, Moon of Saturn www.nasa.gov Enceladus (pronounced en-SELL-ah-dus) is an icy moon of Saturn with remarkable activity near its south pole. Covered in water ice that reflects sunlight like freshly fallen snow, Enceladus reflects almost 100 percent of the sunlight that strikes it. Because the moon reflects so much sunlight, the surface temperature is extremely cold, about –330 degrees F (–201 degrees C). The surface of Enceladus displays fissures, plains, corrugated terrain and a variety of other features. Enceladus may be heated by a tidal mechanism similar to that which provides the heat for volca- An artist’s concept of Saturn’s rings and some of the icy moons. The ring particles are composed primarily of water ice and range in size from microns to tens of meters. In 2004, the Cassini spacecraft passed through the gap between the F and G rings to begin orbiting Saturn. noes on Jupiter’s moon Io. A dramatic plume of jets sprays water ice and gas out from the interior at ring material, coating itself continually in a mantle Space Agency. The Jet Propulsion Laboratory, a many locations along the famed “tiger stripes” at of fresh, white ice. division of the California Institute of Technology, the south pole. Cassini mission data have provided manages the mission for NASA. evidence for at least 100 distinct geysers erupting Saturn’s Rings For images and information about the Cassini on Enceladus. All of this activity, plus clues hidden Saturn’s rings form an enormous, complex struc- mission, visit — http://saturn.jpl.nasa.gov/ in the moon’s gravity, indicates that the moon’s ture. -
Tidal Detachment and Evaporation Following an Exoplanet-Star Collision
MNRAS 000, 000–000 (0000) Preprint 24 June 2019 Compiled using MNRAS LATEX style file v3.0 Orphaned Exomoons: Tidal Detachment and Evaporation Following an Exoplanet-Star Collision Miguel Martinez1, Nicholas C. Stone1;2;3, Brian D. Metzger1 1Department of Physics and Columbia Astrophysics Laboratory, Columbia University, New York, NY 10027, USA 2Racah Institute of Physics, The Hebrew University, Jerusalem, 91904, Israel 3Department of Astronomy, University of Maryland, College Park, MD 20742, USA 24 June 2019 ABSTRACT Gravitational perturbations on an exoplanet from a massive outer body, such as the Kozai- Lidov mechanism, can pump the exoplanet’s eccentricity up to values that will destroy it via a collision or strong interaction with its parent star. During the final stages of this process, any exomoons orbiting the exoplanet will be detached by the star’s tidal force and placed into orbit around the star. Using ensembles of three and four-body simulations, we demonstrate that while most of these detached bodies either collide with their star or are ejected from the system, a substantial fraction, ∼ 10%, of such "orphaned" exomoons (with initial properties similar to those of the Galilean satellites in our own solar system) will outlive their parent exoplanet. The detached exomoons generally orbit inside the ice line, so that strong radiative heating will evaporate any volatile-rich layers, producing a strong outgassing of gas and dust, analogous to a comet’s perihelion passage. Small dust grains ejected from the exomoon may help generate an opaque cloud surrounding the orbiting body but are quickly removed by radiation blow-out. -
The Future Exploration of Saturn 417-441, in Saturn in the 21St Century (Eds. KH Baines, FM Flasar, N Krupp, T Stallard)
The Future Exploration of Saturn By Kevin H. Baines, Sushil K. Atreya, Frank Crary, Scott G. Edgington, Thomas K. Greathouse, Henrik Melin, Olivier Mousis, Glenn S. Orton, Thomas R. Spilker, Anthony Wesley (2019). pp 417-441, in Saturn in the 21st Century (eds. KH Baines, FM Flasar, N Krupp, T Stallard), Cambridge University Press. https://doi.org/10.1017/9781316227220.014 14 The Future Exploration of Saturn KEVIN H. BAINES, SUSHIL K. ATREYA, FRANK CRARY, SCOTT G. EDGINGTON, THOMAS K. GREATHOUSE, HENRIK MELIN, OLIVIER MOUSIS, GLENN S. ORTON, THOMAS R. SPILKER AND ANTHONY WESLEY Abstract missions, achieving a remarkable record of discoveries Despite the lack of another Flagship-class mission about the entire Saturn system, including its icy satel- such as Cassini–Huygens, prospects for the future lites, the large atmosphere-enshrouded moon Titan, the ’ exploration of Saturn are nevertheless encoura- planet s surprisingly intricate ring system and the pla- ’ ging. Both NASA and the European Space net s complex magnetosphere, atmosphere and interior. Agency (ESA) are exploring the possibilities of Far from being a small (500 km diameter) geologically focused interplanetary missions (1) to drop one or dead moon, Enceladus proved to be exceptionally more in situ atmospheric entry probes into Saturn active, erupting with numerous geysers that spew – and (2) to explore the satellites Titan and liquid water vapor and ice grains into space some of fi Enceladus, which would provide opportunities for which falls back to form nearly pure white snow elds both in situ investigations of Saturn’s magneto- and some of which escapes to form a distinctive ring sphere and detailed remote-sensing observations around Saturn (e.g. -
PHYS133 – Lab 4 the Revolution of the Moons of Jupiter
PHYS133 – Lab 4 The Revolution of the Moons of Jupiter Goals: Use a simulated remotely controlled telescope to observe Jupiter and the position of its four largest moons. Plot their positions relative to the planet vs. time and fit a curve to them to determine their orbit characteristics (i.e., period and semi‐major axis). Employ Newton’s form of Kepler’s third law to determine the mass of Jupiter. What You Turn In: Graphs of your orbital data for each moon. Calculations of the mass of Jupiter for each moon’s orbit. Calculate the time required to go to Mars from Earth using the lowest possible energy. Background Reading: Background reading for this lab can be found in your text book (specifically, Chapters 3 and 4 and especially section 4.4) and the notes for the course. Equipment provided by the lab: Computer with Internet Connection • Project CLEA program “The Revolutions of the Moons of Jupiter” Equipment provided by the student: Pen Calculator Background: Astronomers cannot directly measure many of the things they study, such as the masses and distances of the planets and their moons. Nevertheless, we can deduce some properties of celestial bodies from their motions despite the fact that we cannot directly measure them. In 1543, Nicolaus Copernicus hypothesized that the planets revolve in circular orbits around the sun. Tycho Brahe (1546‐1601) carefully observed the locations of the planets and 777 stars over a period of 20 years using a sextant and compass. These observations were used by Johannes Kepler, to deduce three empirical mathematical laws governing the orbit of one object around another. -
CASSINI Exploration of Saturn
CASSINI Exploration of Saturn Launch Location Cape Canaveral Air Force Station Launch Vehicle Titan IV-B Launch Date October 15, 1997 SATURN What do I see when I picture Saturn? Saturn is the sixth planet from the Sun and has been called “The Jewel of the Solar System.” Scientists be- lieve that Saturn formed more than four billion years ago from the same giant cloud of gas and dust whirling around the very young Sun that formed Earth and the other planets of our solar system. Saturn is much larg- er than Earth. Its mass is 95.18 times Earth’s mass. In other words, it would take over 95 Earths to equal the mass of Saturn. If you could weigh the planets on a giant scale, you would need slightly more than 95 Earths to equal the weight of Saturn. Saturn’s diameter is about 9.5 Earths across. At that ratio, if Saturn were as big as a baseball, Earth would be about half the size of a regular M&M candy. Saturn spins on its axis (rotates) just as our planet Earth spins on its axis. However, its period of rotation, or the time it takes Saturn to spin around one time, is only 10.2 Earth hours. A day on Saturn is just a little more than 10 hours long; so if you lived on Saturn, you would only have to be in school for a couple of hours each day! Because Saturn spins so fast, and its interior is gas, not rock, Saturn is noticeably flattened, top and bottom. -
In Situ Exploration of the Giant Planets Olivier Mousis, David H
In situ Exploration of the Giant Planets Olivier Mousis, David H. Atkinson, Richard Ambrosi, Sushil Atreya, Don Banfield, Stas Barabash, Michel Blanc, T. Cavalié, Athena Coustenis, Magali Deleuil, et al. To cite this version: Olivier Mousis, David H. Atkinson, Richard Ambrosi, Sushil Atreya, Don Banfield, et al.. In situ Exploration of the Giant Planets. 2019. hal-02282409 HAL Id: hal-02282409 https://hal.archives-ouvertes.fr/hal-02282409 Submitted on 2 Jun 2020 HAL is a multi-disciplinary open access L’archive ouverte pluridisciplinaire HAL, est archive for the deposit and dissemination of sci- destinée au dépôt et à la diffusion de documents entific research documents, whether they are pub- scientifiques de niveau recherche, publiés ou non, lished or not. The documents may come from émanant des établissements d’enseignement et de teaching and research institutions in France or recherche français ou étrangers, des laboratoires abroad, or from public or private research centers. publics ou privés. In Situ Exploration of the Giant Planets A White Paper Submitted to ESA’s Voyage 2050 Call arXiv:1908.00917v1 [astro-ph.EP] 31 Jul 2019 Olivier Mousis Contact Person: Aix Marseille Université, CNRS, LAM, Marseille, France ([email protected]) July 31, 2019 WHITE PAPER RESPONSE TO ESA CALL FOR VOYAGE 2050 SCIENCE THEME In Situ Exploration of the Giant Planets Abstract Remote sensing observations suffer significant limitations when used to study the bulk atmospheric composition of the giant planets of our solar system. This impacts our knowledge of the formation of these planets and the physics of their atmospheres. A remarkable example of the superiority of in situ probe measurements was illustrated by the exploration of Jupiter, where key measurements such as the determination of the noble gases’ abundances and the precise measurement of the helium mixing ratio were only made available through in situ measurements by the Galileo probe. -
Deep Space Chronicle Deep Space Chronicle: a Chronology of Deep Space and Planetary Probes, 1958–2000 | Asifa
dsc_cover (Converted)-1 8/6/02 10:33 AM Page 1 Deep Space Chronicle Deep Space Chronicle: A Chronology ofDeep Space and Planetary Probes, 1958–2000 |Asif A.Siddiqi National Aeronautics and Space Administration NASA SP-2002-4524 A Chronology of Deep Space and Planetary Probes 1958–2000 Asif A. Siddiqi NASA SP-2002-4524 Monographs in Aerospace History Number 24 dsc_cover (Converted)-1 8/6/02 10:33 AM Page 2 Cover photo: A montage of planetary images taken by Mariner 10, the Mars Global Surveyor Orbiter, Voyager 1, and Voyager 2, all managed by the Jet Propulsion Laboratory in Pasadena, California. Included (from top to bottom) are images of Mercury, Venus, Earth (and Moon), Mars, Jupiter, Saturn, Uranus, and Neptune. The inner planets (Mercury, Venus, Earth and its Moon, and Mars) and the outer planets (Jupiter, Saturn, Uranus, and Neptune) are roughly to scale to each other. NASA SP-2002-4524 Deep Space Chronicle A Chronology of Deep Space and Planetary Probes 1958–2000 ASIF A. SIDDIQI Monographs in Aerospace History Number 24 June 2002 National Aeronautics and Space Administration Office of External Relations NASA History Office Washington, DC 20546-0001 Library of Congress Cataloging-in-Publication Data Siddiqi, Asif A., 1966 Deep space chronicle: a chronology of deep space and planetary probes, 1958-2000 / by Asif A. Siddiqi. p.cm. – (Monographs in aerospace history; no. 24) (NASA SP; 2002-4524) Includes bibliographical references and index. 1. Space flight—History—20th century. I. Title. II. Series. III. NASA SP; 4524 TL 790.S53 2002 629.4’1’0904—dc21 2001044012 Table of Contents Foreword by Roger D.