Analysis of the First Disk-Resolved Images of Ceres from Ultraviolet Observations with the Hubble Space Telescope

Details Analysis of the First Disk-Resolved Images of Ceres from Ultraviolet Observations with the Hubble Space Telescope Analysis of the First Disk-Resolved Images of Ceres from Ultraviolet Observations with the Hubble Space Telescope

Nov 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001dps....33.4115p&link_type=abstract

American Astronomical Society, DPS Meeting #33, #41.15; Bulletin of the American Astronomical Society, Vol. 33, p.1118

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Scientific paper

We present results from our analysis of Hubble Space Telescope Faint Object Camera observations of the asteroid 1 Ceres at near-, mid-, and far-UV wavelengths (3636, 2795, and 1621 Å, respectively). These images, with a resolution of 50 km on the surface of Ceres, provide us with an exciting view of Ceres and its properties. We will discuss the following findings: * We have identified a large, ~ 250 km diameter surface feature, although its nature (crater, albedo variegation, or other effect) is uncertain. * Limb fits to the images give semi-major and semi-minor axes of R1=484.8 +/- 5.1 km and R2=466.4 +/- 5.9 km, respectively, for the illumination-corrected projected ellipsoid. * Full-disk integrated albedo measurements show that Ceres has a red spectral slope from the mid- to near-UV, and a significant blue slope shortward of the mid-UV. * Minnaert surface fits to the near- and mid-UV images indicate an unusually large Minnaert parameter of k ~ 0.9, suggesting a more Lambertian than lunar-like surface. Support for this work was provided by NASA through STScI Grant GO-05842.

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