Lunar and Planetary Science XLVIII (2017) sess312.pdf

Tuesday, March 21, 2017 [T312] POSTER SESSION I: CERES: MISSION RESULTS FROM DAWN 6:00 p.m. Town Center Exhibit Area

Russell C. T. Raymond C. A. De Sanctis M. C. Nathues A. Prettyman T. H. et al. POSTER LOCATION #171 Dawn at Ceres: What We Have Learned [#1269] A summary of the major discoveries and their implications at the close of the exploration of Ceres by Dawn.

Ermakov A. I. Park R. S. Zuber M. T. Smith D. E. Fu R. R. et al. POSTER LOCATION #172 Regional Analysis of Ceres’ Gravity Anomalies [#1374] Put in geological and geomorphological context, the regional gravity anomalies give clues on the structure and evolution of Ceres’ crust.

Nathues A. Platz T. Thangjam G. Hoffmann M. Mengel K. et al. POSTER LOCATION #173 Evolution of Occator Crater on (1) Ceres [#1385] We present recent results on the origin and evolution of the bright spots (Cerealia and Vinalia Faculae) at crater Occator on (1) Ceres.

Buczkowski D. L. Scully J. E. C. Schenk P. M. Ruesch O. von der Gathen I. et al. POSTER LOCATION #174 Tectonic Analysis of Fracturing Associated with Occator Crater [#1488] The floor, walls, and ejecta of Occator Crater on Ceres are cut by multiple sets of linear and concentric fractures. We explore possible formation mechanisms.

Pasckert J. H. Hiesinger H. Raymond C. A. Russell C. POSTER LOCATION #175 Degradation and Ejecta Mobility of Impact Craters on Ceres [#1377] We investigated the degradation and ejecta mobility of craters on Ceres, to investigate latitudinal variations, and to compare it with other planetary bodies.

Schmedemann N. Neesemann A. Schulzeck F. Krohn K. von der Gathen I. et al. POSTER LOCATION #176 The Distribution of Impact Ejecta on Ceres [#1233] Ceres is a fast rotating small body. High flying impact ejecta are heavily affected by Coriolis forces, resulting in highly asymmetric distal ejecta patterns.

Bland M. T. Raymond C. A. Fu R. R. Ermakov A. Schenk P. M. et al. POSTER LOCATION #177 Ceres’ Largest Impact Crater, Kerwan: Inferring Local Interior Structure from Its Peculiar Morphology [#2040] Ceres’ large crater / Peculiar in form and shape / Something hides below.

Schulzeck F. Schmedemann N. Schröder S. Carsenty U. Jaumann R. et al. POSTER LOCATION #178 Ejecta Pattern and Velocities of a Boulder Crater on Ceres [#1387] We model the reimpact pattern of ejected particles of a boulder crater on Ceres and correlate landing sites with the corresponding launch velocities.

von der Gathen I. Krohn K. Schulzeck F. Jaumann R. Buczkowski D. L. et al. POSTER LOCATION #179 The Geometry and Possible Origin of Fractures in Floor-Fractured Craters on Ceres [#1390] We determined the length, width, and strike of linear features in FFCs on Ceres to get information about surface, underground, and formation conditions.

Lunar and Planetary Science XLVIII (2017) sess312.pdf

Toplis M. J. Monnereau M. Prettyman T. H. Castillo-Rogez J. McSween H. Y. Jr et al. POSTER LOCATION #180 Water Within Ceres and the Question of Bulk Composition: Constraints and Implications [#1951] The distribution of water within Ceres is considered using geophysical and chemical constraints of the Dawn mission, and numerical models of thermal evolution.

Raponi A. De Sanctis M. C. Ciarniello M. Ammannito E. Frigeri A. et al. POSTER LOCATION #181 Water Ice on Ceres’ Surface as Seen by Dawn-Vir: Properties Retrieval by Means of Spectral Modeling [#2007] Water ice have been derived in localized areas on the surface of Ceres by means of the Dawn/VIR instrument. We derive its properties thank to the Hapke model.

Formisano M. Federico C. De Sanctis M. C. Frigeri A. Magni G. et al. POSTER LOCATION #182 Thermal Stability of Water Ice on Ceres’ Surface: The Juling Case [#1976] We study the ice stability on Ceres’ surface, by performing numerical simulations in which we tested the effects of thermal inertia and albedo.

Zolotov M. Yu. Mironenko M. V. POSTER LOCATION #183 Bright Salts on Ceres: Aqueous Accumulation and Airborne Emplacement [#1241] Subsurface low-pressure boiling of post-impact water solutions causes accumulation of salts at depth and deposition of salty ice grains from plumes.

Ehlmann B. L. Hodyss R. Ammannito E. Rossman G. R. De Sanctis M. C. et al. POSTER LOCATION #184 Ammoniation of Phyllosilicates, Carbonaceous Chondrite Meteorites, and Implications for the Nature of Ammoniated Materials on Ceres [#2088] Comparison of VIR spectra of Ceres with new lab data acquired at Ceres temperatures show ammoniated Mg smectites with Mg-serpentine are the key phases.

Bu C. Rodriguez Lope G. Dukes C. A. McFadden L. A. Li J.-Y. et al. POSTER LOCATION #185 Instability of Magnesium Sulfate Hexahydrate (MgSO4.6H2O) on Ceres: Laboratory Measurements [#2996] We determine the stability of MgSO4.6H2O on Ceres surface from lab measurements by quantifying the dehydration rate as a function of pressure and temperature.

Tosi F. Carrozzo F. G. Zambon F. Ciarniello M. Frigeri A. et al. POSTER LOCATION #186 Mineralogical Analysis of Quadrangle Ac-H-6 Haulani on the Dwarf Planet Ceres [#1857] We report on the mineralogic mapping of quadrangle Ac-H-6 ‘Haulani,’ one of five quadrangles that cover the equatorial region of the dwarf planet Ceres.

Longobardo A. Palomba E. De Sanctis M. C. Carrozzo F. G. Galiano A. et al. POSTER LOCATION #187 Mineralogical Mapping of the Occator Quadrangle [#2044] This work describes the mineralogical mapping of the Occator quadrangle of Ceres, extending from latitude 22°S to 22°N and from longitudes 216°E to 288°E.

Zambon F. Carrozzo F. G. Tosi F. Ciarniello M. Combe J.-Ph. et al. POSTER LOCATION #188 Spectral Analysis of the Quadrangle Ac-H-10 Rongo on Ceres [#2057] We present the spectral analysis of the quadrangle Ac-H-10 Rongo on Ceres. We describe the principal results obtained by VIR spectrometer onboard Dawn.

Lunar and Planetary Science XLVIII (2017) sess312.pdf

Palomba E. Longobardo A. De Sanctis M. C. Galiano A. Carrozzo F. G. et al. POSTER LOCATION #189 Mineralogical Mapping of the Kerwan Quadrangle on Ceres [#2066] This work describes the mineralogical mapping of the Kerwan quadrangle of Ceres, extending from latitude 22°S to 22°N and from longitudes 72°E to 144°E.

De Sanctis M. C. Ammannito E. Carrozzo F. G. Zambon F. Ciarniello M. et al. POSTER LOCATION #190 Mineralogy of the Sintana-Toharu Region on Ceres [#2093] We present the first mineralogical maps of the Sinatana and Toharu southern quadrangles on Ceres, between latitudes 20°S and 65°S and longitudes 0°E and 180°E.

Carrozzo F. G. De Sanctis M. C. Ammannito E. Ciarniello M. Frigeri A. et al. POSTER LOCATION #191 Spectral Analysis of the Qyadrangle Ac-H-08 Nawish on Ceres [#2193] This work describes the mineralogical mapping of the Nawish quadrangle of Ceres, extending from latitude 22°S to 22°N and from longitudes 144°E to 216°E.

Stephan K. Jaumann R. Zambon F. Carrozzo F. G. De Sanctis M. C. et al. POSTER LOCATION #192 Spectral Investigation of Quadrangle Ac-H-3 of the Dwarf Planet Ceres – The Region of Impact Crater Dantu [#2446] In this study we explore the surface composition in the Ac-H 3 quadrangle of Ceres’ surface named after its dominating surface feature Dantu.

Ammannito E. De Sanctis M. C. Carrozzo F. G. Zambon F. Ciarniello M. et al. POSTER LOCATION #193 Composition of the Urvara-Yalode Region on Ceres [#2659] We present here the first results of the mineralogical mapping of the Urvara and Yalode quadrangles on Ceres.

Combe J.-Ph. Singh S. Johnson K. E. McCord T. B. De Sanctis M. C. et al. POSTER LOCATION #194 Surface Composition of Ceres Quadrangle Ac-4 Ezinu by the Dawn Mission [#2849] The surface composition of the quadrangle Ezinu is investigated by near-infrared reflectance spectroscopy and high-resolution imagery.

Singh S. Combe J. P. McFadden L. A. Ruesch O. McCord T. et al. POSTER LOCATION #195 Mineralogical Mapping of Ac-05 Fejokoo Quadrangle of Ceres [#2927] Surface mineralogy of the Ac-05 Fejokoo quadrangle.

Vu T. H. Hodyss R. Johnson P. V. Choukroun M. POSTER LOCATION #196 Preferential Formation of Sodium Salts from Frozen Sodium-Ammonium-Chloride-Carbonate Brines: Implications for Ceres’ Bright Spots [#2227] Sodium salts form preferentially in frozen Ceres-like brines. Potential presence of NH4Cl on Ceres’ surface may imply an ocean rich in ammonium and/or chloride.

Ruesch O. Nathues A. Jaumann R. Quick L. C. Bland M. T. et al. POSTER LOCATION #197 Faculae on Ceres: Possible Formation Mechanisms [#2435] Faculae are bright, carbonate-rich regions on dwarf planet Ceres. Their formation might require extrusion of ice and/or brine in the recent past.

Lunar and Planetary Science XLVIII (2017) sess312.pdf

Scully J. E. C. Buczkowski D. L. Schenk P. M. Neesemann A. Raymond C. A. et al. POSTER LOCATION #198 The Geologic History and Formation of the Faculae in Occator Crater on Ceres [#1683] Based on a detailed geologic map, we propose a geologic history for Occator Crater and a formation mechanism for the bright regions (faculae) it contains.

Mazarico E. Ermakov A. I. Schröder S. E. Carsenty U. Schorghofer N. et al. POSTER LOCATION #199 The History of Ceres’ Obliquity and Its Effect on Permanent Shadow [#1985] We study the periodic variations in Ceres’ obliquity and their effect on permanent shadow. We discuss implications for long-term surface stability.

Mao X. McKinnon W. B. POSTER LOCATION #200 Fossil Rotational Bulge from Faster Paleo-Spin and Isostatic Excess Topography Can Explain Ceres’ Present-Day Shape and Gravity [#2744] Whereas a faster spin can reconcile Ceres’ degree-2 gravity from hydrostatic shape prediction, an isostatically-compensated topography fulfills the same purpose.