Physics – Optics
Scientific paper
Jul 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001hst..prop.9059m&link_type=abstract
HST Proposal ID #9059
Physics
Optics
Hst Proposal Id #9059 Solar System
Scientific paper
We propose to acquire separte, comparative, and simultaneous spectra of asteroid 762 Pulcova and its satellite. We will compare our results with those we obtain[ed] in a program approved in cycle 9 for 45 Eugenia and its moon. We discovered both of these moons using ground-based adaptive optics - Eugenia in 1998, but Pulcova only in the last year. We can now compare two systems that both have primaries of the relatively uncommon F-like spectral class. We will use the high-spatial-resolution and UV-capabilities of STIS to obtain medium-resolution spectra over the range 2900-10300 Anstrom, using only two grating settings, on a single HST orbit. We will determine whether the surface compositions are similar or different in the parent-satellite pair and test hypotheses concerning satellite production mechanisms. Our fits to the orbits yield a surprisingly low density for Eugenia of 1.2 g/cm^3, but that of Pulcova is 50% higher. F-type spectra are similar to the common C-types, but differ by the lack of a UV-band or UV-dropoff and by subtle, but measurable differences in the spectral slope. Both the UV-region and the existence of subtle absorption features in the near-IR {approx 9000 Anstroms} are diagnostic of the specific differences between F-, C-, and {Bus'} X-class. HST is required because the ground-based adaptive optics is not available in the UV and cannot yet provide adequate resolution in the visible.
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