Ceres Observations with HST: Size, Shape, Pole and Rocky Core

Details Ceres Observations with HST: Size, Shape, Pole and Rocky Core Ceres Observations with HST: Size, Shape, Pole and Rocky Core

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufm.p31c..01p&link_type=abstract

American Geophysical Union, Fall Meeting 2004, abstract #P31C-01

Physics

6035 Orbital And Rotational Dynamics, 6055 Surfaces And Interiors

Scientific paper

Our team has obtained 259 images of Ceres using the High Resolution Channel of the Advanced Camera for Surveys on the Hubble Space Telescope. These images were obtained at high temporal sampling in three filter bands (V, U, and Mid-UV) over the entire rotational phase of Ceres. The resolution was 30 km/pixel, allowing us to detect and follow the motions of surface features on Ceres for the first time. Light and dark patches are seen on the surface, with high contrast and differences among the three filters. A strong feature near the equator provided a control point to definitively determine the rotational pole of Ceres: RA=291 deg and Dec=59 deg. Based on limb fits to an accuracy of nearly 0.1 pixel, our shape measurements show that Ceres is rotationally symmetric with an equatorial radius of 487.3 km and a polar radius of 454.7 km with roughly 5 km uncertainties. This flattening is significantly less than expected for a relaxed body of Ceres' mean density and rotation period, but it is consistent with such a body if Ceres has a central rocky core surrounded by water ice. Support for this project is through STScI grant HST-GO-09748.

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