Mars-Moon Exploration, Reconnaissance, and Landed Investigation

  • View
    40

  • Download
    2

Embed Size (px)

DESCRIPTION

Mars-Moon Exploration, Reconnaissance, and Landed Investigation. Andrew Rivkin , Scott Murchie, Nancy Chabot, Albert Yen, Raymond Arvidson , Justin Maki, Ashitey Trebi- Ollennu , Alian Wang, Ralf Gellert , Michael Daly, Frank Seelos , Douglas Eng , Yanping Guo , and Elena Adams. - PowerPoint PPT Presentation

Text of Mars-Moon Exploration, Reconnaissance, and Landed Investigation

  • Mars-Moon Exploration,Reconnaissance, and Landed InvestigationAndrew Rivkin, Scott Murchie, Nancy Chabot, Albert Yen, Raymond Arvidson, Justin Maki, Ashitey Trebi-Ollennu, Alian Wang, Ralf Gellert, Michael Daly, Frank Seelos, Douglas Eng, Yanping Guo, and Elena AdamsInternational Planetary Probe Workshop Toulouse, France

  • *Phobos and DeimosAre the only terrestrial planet satellites besides the Moon

    Therefore they provide insights into terrestrial planet formation

    Reconnaissance by several missions gives us a working knowledge of the moons outstanding science issues*

    PhobosDeimosSize27 x 21 x 19 km15 x 12 x 10 kmOrbital Period7.66 hrs30.3 hrsDensity1.9 g/cm31.5 g/cm3Semi-major axis9,377 km (2.8 RMars)23,460 km (~7 RMars)Gravity2-8 x 10-3 m/s22 x 10-3 m/s2

  • *Spectral PropertiesWavelength (m)0.51.01.52.02.50.000.020.040.060.000.050.100.15Phobos, DeimosMature lunar mare soilPhobosMurchison (CM)Mighei (CM)Tagish Lake(D-like?)Reflectance at i=30, e=0Very low albedoReddish No sign of bound water, OH, or organics*From: Fraeman et al. (2012)

  • *Phobos and Deimos Science DriversComposition and origin unknown a record of the early Mars system lost from Mars surface

    Possibly C rich insight into origin of terrestrial planet C (and volatiles?)

    A laboratory for small-body geologic processes

    Nominal target due to lower DV requirements, smooth surface*

    PhobosDeimosSize27 x 21 x 19 km15 x 12 x 10 kmOrbital Period7.66 hrs30.3 hrsDensity1.9 g/cm31.5 g/cm3Semi-major axis9,377 km (2.8 RMars)23,460 km (~7 RMars)Gravity2-8 x 10-3 m/s22 x 10-3 m/s2

  • Formed from Mars material Primitive materialPlus Explains low r, albedo Explains similarity to D-type asteroidsMinus Capture from outside Mars system hard to explainPlus Explains the orbits if formed by co-accretionMinus Does not explain low albedo

    *Depending on the origin, a different composition is expected!What are the origins of Phobos and Deimos?MERLIN Questions*

    Origin HypothesisComposition PredictedElemental abundancesMineral abundancesCapture of organic- and water-rich outer solar system bodyUltra-primitive composition; Tagish Lake is the best known analogHigh C; high Zn/Mn; high S; composition possibly distinct from known meteoritesAbundant phyllosilicates; carbonates and organic phases; anhydrous silicate phases rareCapture of organic and water-poor outer solar system bodyAnhydrous silicates plus elemental CHigh C; Mg/Fe ratio ~24; bulk composition unlike any meteorite analogsAnhydrous, med. Fe (2040%) pyroxene; abundant amorphous C or graphite?Capture of inner solar system bodyComposition like common meteorites (e.g., ordinary chondrites)Mg/Si ~0.81, Al/Si ~0.050.1; Zn/Mn and Al/Mn ratios separate known meteorites; low CLow carbonates, phyllosilicates; pyroxene, olivine probably in range of known meteoritesCo-accretion with MarsBulk Mars; similar to ordinary chondrites but specific SNC-derived composition Mg/Si, Al/Si, Fe/Si indicative of bulk Mars; low C; Zn/Mn, Al/ Mn like ordinary chondritesAnhydrous silicates with Fe, Mg expected for bulk Mars; low abundance of C-bearing phasesGiant impact on MarsEvolved Martian crust or mantle, like SNC meteorites, Mars rocks or soilHigh Al/Si, Ca/Si, lower Fe/Si, Mg/Si indicative of evolved igneous materialsEvolved, basaltic mineralogy consistent with many datasets for Mars

  • Kaidun MeteoriteAre they water-rich, carbon-rich bodies? Spectrally, Deimos is D-type and may be carbon and volatile-rich Remote measurements are ambiguous about composition Need in situ composition measurements to understand the D-type objects and characterize C-containing materials

    What processes were important in Deimos evolution? Impacts? Space weathering ? Material exchange with Phobos/ Mars or other extinct martian moons ?*MERLIN Questions*

  • *MERLIN Traceability to Visions and Voyages*

    Questions about Phobos / DeimosVisions and Voyages Primitive Bodies QuestionsRelevant MeasurementsWhat are Phobos and Deimos origin and relationship to other solar system bodies?What were the initial stages, conditions and processes of solar system formation?Elemental compositionMineral abundanceShape and volumeMass and mass distributionDo Phobos and Deimos contain water and carbon, and in what form?What governed the supply of water to the inner planets?Occurrence and abundance of hydrated mineralsWhat were the primordial sources of organic matter?Occurrence and abundance of C phasesAbundance of elemental CWhat geologic processes that have shaped Phobos and Deimos surface and regolith?How have the myriad chemical and physical processes that shaped the solar system operated, interacted, and evolved over time?Characterize regolith movement and gradationDetermine processes by which grooves formDetermine how space weathering alters regolith properties

    Elemental measurement(APXS)Mineralogical measurement (Raman spectroscopy)Imaging (orbital color/morphology, landed panoramic / microscopic)Radio science

  • MERLIN Spacecraft*Highlights:Requires DV 1900 m/s incl. marginBipropellant propulsion system3-axis stabilized120-kg Li-ion battery for 15-hr nightSame design can target Phobos with smaller battery, tanks filled

  • MERLIN Payload**

    InvestigationDescription, HeritageData TakenBody MountedDDIS: Deimos Dual Imaging SystemNAC: monochromeWAC: 11 spectral and 1 clear filterBased on MESSENGER MDIS/ NAC, WAC without gimbalingStereo mapping/ OpNav: global 1 m/pixel; 5 cm/pixel during low flyoversColor mapping: global 10 m/pixel; 20 cm/pixel during low flyovers; descent imaging 1 mm/pixelTerrainCam, OpsCam Stereo CamerasTerrainCam: 820 rad/pixel, with azimuth articulationOpsCam: Stereo, 123 FOV, 2.1 mrad/pixel; Based on MER/Navcam, HazcamStereo imaging of workspace to support arm operations; imaging at multiple photometric angles; local panoramasArm-mountedAPXS: Alpha Particle X-ray SpectrometerMeasures and X-ray fluorescence from 244Cm source; Based on MER/MSL APXS 3 landed elemental abundance measurements in and X-ray modesMRS: MERLIN Raman SpectrometerLaser scatter peaks at wavelengths diagnostic of minerals, C-phasesSample of 100 landed infocus spectra in arm workspaceMAC: MERLIN Arm CameraMicroscopic imaging, with LEDs for three-color imaging; Adapted from SM-4Microscopic and synoptic color imaging of arm workspaceOptional Enhancements to Address Human Exploration Strategic Knowledge GapsDosimeterMeasures radiation dose; Based on RBSPLow-rate measurements of total doseDust counterMeasures dust; Based on New HorizonsTimes and magnitudes of particle impacts

  • MERLIN Mission: Cruise Phase*Cruise to Mars(1) Launch, C3 ~10.8 km2/s2(2) 28-month cruise on type IV trajectory, 1 orbits around Sun(3) Mars orbit insertion saves >600 m/s compared with type I*

  • MOI Initial orbit around Mars, crossing both moons orbitsMOI and Transitionto Orbit at DeimosDeimosMERLIN Mission: Transition Phase*(2) Raise periapse to transition orbit(3) Lower apoapse to moons orbit

  • Initial gravity, shape, colorRefined gravity, shape, color; photometryHigh phase for shapeSecond color/photometry/ shape periodGravity and high-res. color/stereoProximity Operations(Nearly Co-orbital with Deimos)DeimosMERLIN Mission:Rendezvous PhaseAltitudePhase angle*

  • Deimos3 weekly 1- to 2-km flyovers to certify landing siteDeimos FlyoversMERLIN Mission:Low Flyover PhasePossible landing sites (selected prior to launch) characterized during low flyovers*

  • During landing, images used for terrain navigation are downlinked real timeLanding andLanded OperationsMERLIN Mission: Landing / Landed Ops**Landed investigation takes ~60 days. The spacecraft can hop to 1 or 2 additional sites.

  • MERLIN Fills Strategic Knowledge Gaps**

    MERLIN MeasurementsHuman Exploration Strategic Knowledge Gap AddressedMeasure abundances of major, minor elements using APXSRegolith elemental compositionMeasure abundances of major mineral phases using MRSRegolith mineralogical compositionConstrain regolith heterogeneity using high resolution color imaging by DDIS/WAC during low flyovers, descentMeasure global shape using stereo imaging by DDIS/NACShape model, pole, rotational stateImage in stereo morphologic features indicative of regolith processes using DDIS/NACRegolith mechanical propertiesHigh-resolution terrain modelDetermine regolith texture with imaging by TerrainCam, MACConstrain space weathering by repeating Raman measurements at surface and after excavating 1 cmNested descent images during landing to locate landing sitePlume effects on regolithMeasure mass and mass distribution using Doppler trackingSmall body gravitational fieldMeasure abundances of H2O, OH-bearing phases w/ MRSVolatiles and potential for in situ resource utilizationMeasure abundances of C-bearing phases w/ MRSMeasure content of C w/ APXSBound radiation effect on space weathering /measuring doseHuman tissue effectsConstrain density of dust belts using dust counterMars orbital debris environment