Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008dps....40.2808l&link_type=abstract
American Astronomical Society, DPS meeting #40, #28.08; Bulletin of the American Astronomical Society, Vol. 40, p.437
Astronomy and Astrophysics
Astronomy
Scientific paper
Despite being the largest and the first asteroid discovered, Ceres does not have diagnostic spectral signatures in its observed spectrum from about 400 nm to 2500 nm. Its composition and evolutionary history are thus not well understood. Substantial efforts have been made to study the composition of Ceres using various spectral ranges, and to support NASA's Dawn mission and scheduled arrival at Ceres in 2015. In the analysis of multi-wavelength HST images, a relatively broad and deep absorption centered at about 280 nm UV region was observed (Li et al., 2006). However, due to the coarse wavelength sampling of the available filters for images in this spectral range, this absorption feature could not be well characterized and analyzed. In Nov 2007, we obtained the spectrum of Ceres from 120 nm to 200 nm using the HST/ACS/SBC slitless prism, as well as some images through the F125LP filter, to confirm the absorption band and to study the feature. Preliminary analysis from photometry of imaging data confirms that the 280-nm absorption feature is most likely a discrete absorption band. The processing and analysis of spectral data is ongoing. We plan to exercise spectral deconvolution to restore the degraded slitless spectrum due to the large angular size of Ceres. The HST spectrum will be combined with the IU spectrum of Ceres from 200 nm to 280 nm, as well as previous imaging and spectral data at wavelengths beyond 300 nm to characterize the UV absorption, and to provide some clues about the composition of the surface of Ceres. This work is supported by Space Telescope Science Institute through grant HSTGO1110901A to University of Maryland at College Park.
A'Hearn Michael F.
Ammannito Eleonora
Coradini Angioletta
de Sanctis Christina
Li Jianyang
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