Other
Scientific paper
Sep 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009dps....41.5908w&link_type=abstract
American Astronomical Society, DPS meeting #41, #59.08
Other
Scientific paper
We report on ultraviolet (UV) and visible imaging of asteroid (21) Lutetia using the Hubble Space Telescope (HST). WFPC2 images using the F218W, F255W, F300W, and F606W filters, and ACS/SBC images using the F140LP and F165LP filters, were obtained on UT 2008 Nov 21 at a heliocentric distance of 2.42 AU, a geocentric distance of 1.44 AU, and a solar phase angle of 0.5 deg. WFPC2 images through the F450W and F606W filters were obtained on 2008 Dec 15 and 16 at heliocentric distance of 2.45 AU, a geocentric distance of 1.51 AU, and a solar phase angle of 8 deg. The asteroid is slightly resolved in both the WFPC2 and ACS/SBC images, providing direct information on the size and shape. Both the direct measurements and the filter photometry of Lutetia are consistent with an effective diameter of 95 km, which is similar to previously determined values. Deep images in the F606W filter were used to search for companions and dust debris within Lutetia's Hill sphere. There are no bound companions larger than 1 km (assuming identical albedo to Lutetia) in the region >1000 km from Lutetia, and we expect to push the size limit on companions down to 50-100 m with further analysis. Subtraction of the two ACS/SBC images (F140LP-F165LP), together with careful modeling, is used to determine the albedo at FUV wavelengths ( 150 nm), which is critical information for optimizing the observations of Lutetia by the Alice UV spectrograph during the Rosetta flyby on UT 2010 Jul 10. The combination of the Hubble FUV, NUV, visible data provides information on Lutetia's albedo over a large wavelength range (150-700 nm) and should provide further insights into the physical properties and composition of Lutetia's surface, which can be compared with the results from other asteroids.
A'Hearn Michael F.
Alan Stern S.
Bertaux Jean Loup
Feaga Lori M.
Feldman Paul D.
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