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  High-resolution shape model of Ceres from stereophotoclinometry using Dawn Imaging Data

Park, R., Vaughan, A., Konopliv, A., Ermakov, A., Mastrodemos, N., Castillo-Rogez, J., et al. (2019). High-resolution shape model of Ceres from stereophotoclinometry using Dawn Imaging Data. Icarus, 319, 812-827. doi:10.1016/j.icarus.2018.10.024.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0003-C8AE-8 Version Permalink: http://hdl.handle.net/21.11116/0000-0003-C8AF-7
Genre: Journal Article

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 Creators:
Park, R.S., Author
Vaughan, A.T., Author
Konopliv, A.S., Author
Ermakov, A.I., Author
Mastrodemos, N., Author
Castillo-Rogez, J.C., Author
Joy, S.P., Author
Nathues, Andreas1, Author              
Polanskey, C.A., Author
Rayman, M.D., Author
Riedel, J.E., Author
Raymond, C.A., Author
Russell, C.T., Author
Zuber, M.T., Author
Affiliations:
1Department Planets and Comets, Max Planck Institute for Solar System Research, Max Planck Society, ou_1832288              

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Free keywords: Ceres shape Ceres topography Ceres spin pole Ceres rotation Stereophotoclinometry using Dawn data Dawn gravity science
 Abstract: We present a high-resolution global shape model of Ceres determined using the stereophotoclinometry technique developed at the Jet Propulsion Laboratory by processing Dawn's Framing Camera data acquired during Approach to post-Low Altitude Mapping Orbit (LAMO) phases of the mission. A total of about 38,000 images were processed with pixel resolutions ranging from 35.6 km/pixel to 35 m/pixel and the final global shape model was produced with 100-m grid spacing. The final SPC-derived topography was computed relative to the (482 km, 482 km, 446 km) mean ellipsoid, which ranges from −7.3 km to 9.5 km. For the purpose of validation, we performed various error analyses to assess and quantify realistic uncertainties in the derived topography, such as dividing the data into different subsets and re-computing the entire topography. Based on these studies, we show that the average total height error of the final global topography model is 10.2 m and 88.9% of the surface has the total height error below 20 m. We also provide improved estimates of several physical parameters of Ceres. The resulting GM estimate is (62.62905 ± 0.00035) km3/s2, or the mass value of (938.392 ± 0.005) × 1018 kg. The volume estimate is (434.13 ± 0.50) × 106 km3 with a volumetric mean radius of 469.72 km. Combined with the mass estimate, the resulting bulk density is (2161.6 ± 2.5) kg/m3. Other improved parameters include the pole right ascension, α0 = (291.42763 ± 0.0002)°, pole declination, δ0 = (66.76033 ± 0.0002)°, and prime meridian and rotation rate of (W0 = 170.309 ± 0.011)° and (dW/dt = 952.1532635 ± 0.000002) deg/day, respectively. Also, for geophysical and geological studies, we provide spherical harmonic coefficients and a gravitational slope map derived from the global shape model.

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Language(s): eng - English
 Dates: 2019
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1016/j.icarus.2018.10.024
 Degree: -

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Title: Icarus
Source Genre: Journal
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Publ. Info: Amsterdam : Elsevier B.V.
Pages: - Volume / Issue: 319 Sequence Number: - Start / End Page: 812 - 827 Identifier: ISSN: 0019-1035
CoNE: https://pure.mpg.de/cone/journals/resource/954922645023