Ammannito, E.

Buczkowski, D.L.

Carrozzo, G.

De Sanctis, M.C.

Frigeri, A.

Jaumann, R.

Kneissl, T.

Mest, S.

Preusker, Frank

Raymond, C.A.

Roatsch, T.

Russell, C.T.

Scully, J.E.C.

Williams, D.A.

Institute of Transport Research:Publications

GEOLOGIC MAPPING OF THE AC-H-08 NAWISH QUADRANGLE OF CERES FROM NASAs DAWNMISSION. A. Frigeri1, M.C. De Sanctis1, E. Ammannito1, G. Carrozzo1, D. Williams3, S. Mest4, D. Buczkowski5,F. Preusker6, R. Jaumann6, T. Roatsch6, J. Scully7, T. Kneissl8, C.A. Raymond7, C.T. Russell2. 1Istituto di Astrofisicae Planetologia Spaziali, Istituto Nazionale di Astrofisica, via del Fosso del Cavaliere, 00133 Roma, Italy (alessan-dro.frigeri@iaps.inaf.it); 2Institute of Geophysics and Planetary Physics, University of California at Los Angeles,Los Angeles, California, USA; 3Arizona State University, Tempe, AZ; 4Planetary Science Institute, Tucson, Arizona,USA; 5German Aerospace Center (DLR), Berlin, Germany; 6JHU Applied Physics Laboratory Laurel, Maryland,USA; 7NASA Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California, USA; 8Freie Uni-versitt Berlin, Malteserstr. 74-100, 12249 Berlin, Germany;Introduction NASAs Dawn spacecraft arrived atCeres onMarch 5, 2015, and has been studying the dwarfplanet through a series of successively lower orbits, ob-taining morphological and topographical image, miner-alogical, elemental, and gravity data. The Dawn ScienceTeam is conducting a geologic mapping campaign forCeres similar to that done for Vesta [1,2], including pro-duction of a Survey- and High Altitude Mapping Orbit(HAMO)-based global map, and a series of 15 Low Al-titude Mapping Orbit (LAMO)-based quadrangle maps.In this abstract we discuss the geologic evolution of theAc-H-08 Nawish Quadrangle, located between -22◦ and22◦ North and from 144 to 216◦ East. The quadrangle’sname comes from the crater Nawish which is located inthe northern sector of the quadrangle. The currently ap-proved IAU nomenclature includes four features whichare described in table 1.Mapping Data At the time of this writing LAMO im-ages (35 m/pixel) are just becoming available. Thus,our geologic maps are based on HAMO images (140m/pixel) and Survey (400 m/pixel) digital terrain mod-els (for topographic information). Dawn Framing Cam-era (FC) color images are also used to provide contextfor map unit identification. The maps to be presented asName Type OriginNawish Crater Acoma (New Mexico, SWUSA) guardian of the field.Heneb Crater Egyptian god of grain, produce,and vineyards.Kumitoga Crater Polynesian goddess of plantlife.SamhainCatenaCatena Gaelic festival at the end of theharvest season. It was observedin Ireland and Scotland during7 days in October and Novem-ber, nearly halfway between theautumn equinox and the wintersolstice.Table 1: The names of features in the Ac-H-08 NawishQuadrangle currently approved by IAUposters will be updated from analyses of LAMO images.Results The geologic map of the quadrangle is re-ported in Figure 2.Samhain Catena is the main tectonic feature of thequadrangle in the south-eastern sector, with a West-northwest trend (108-288◦). The largest units of thequadrangle are the smooth material (s), and the cratered(a)(b)Figure 1: (a) Heneb crater. (b) unnamed 19 km diametercrater located at 158.2◦E and 11.1◦N2271.pdf47th Lunar and Planetary Science Conference (2016)Figure 2: The geologic map of Ac-H-08 Nawish Quadrangle of Ceres, located between -22◦ and 22◦ North and from144◦ to 216◦ East. Mapping base is Dawn FC HAMO mosaic (courtesy DLR).materials. The cratered materials have been divided incratered plains (cp) and cratered highlands (ch) on thebasis of their topography. The north-western sector ofthe quadrangle shows units related to the 125 km diame-ter Dantu crater of the Ac-H-3 quadrangle [3], with darkand brigth albedo crater rays system. The craters showa very diverse morphology across the study area. Thelargest crater of the quadrangle is Kumitoga of 95 km di-ameter, highly degraded and without ejecta blanket, lo-cated at 178.6◦E and 10.1◦S. The 75 km diameter Naw-ish crater gives the name to the quadrangle and shows aflat bottom and a central pit of 8 km in diameter, whichis consistent with other craters of Ceres with a diameterhigher than 75 km [4]. Heneb crater (Figure 1a) showsbrigth spots on the floor and terraced walls in its SW andNE sector. In the western part of the quadrangle there is adark-albedo unnamed crater (Figure 1b) with very steepand fresh walls showing a very high horizontal albedovariation in the southern part.Future Work The upcoming Low Altitude MappingOrbit (LAMO) data represent the higher spatial resolu-tion data we will receive from the Dawn mission thusthey will be used to put constraints in the current map-ping work. Color filter data analysis of FC will be used toextract the main compositional variation across the quad-rangle, and to address VIR mineralogic analyses [5] overspecific targets.References [1] Williams D.A. et al. (2014) Icarus,244, 1-12. [2] Yingst R.A. et al. (2014) PSS, 103, 2-23.[3] Kneissl T. et al. (2016) this conference. [4] SchenkP. et al. (2016) this conference. [5] De Sanctis M.C et al.(2016) this conference.Acknowledgements The support of R.A. Yingst, C.M.Pieters, A. Nathues, M. Hoffmann, M. Schaefer, S.Marchi, M.C. De Sanctis, C.T. Russell, C.A. Raymond,and the Dawn Instrument, Operations, and ScienceTeams is gratefully acknowledged. This work is sup-ported by grants from NASA through the Dawn project,and from the German Space Agency (DLR) and the Ital-ian Space Agency (ASI).2271.pdf47th Lunar and Planetary Science Conference (2016)

Geologic Mapping of the AC-H-08 Nawish Quadrangle of Ceres from NASA’s Dawn Mission

Geologic Mapping of the AC-H-08 Nawish Quadrangle of Ceres from NASA’s Dawn Mission

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