UVBRI Photometry of Janus and Epimetheus

Details UVBRI Photometry of Janus and Epimetheus UVBRI Photometry of Janus and Epimetheus

Jul 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003hst..prop.9954v&link_type=abstract

HST Proposal ID #9954

Physics

Hst Proposal Id #9954 Solar System

Scientific paper

We will study the spectrophotometric properties of the small, coorbital saturnian satellites Janus and Epimetheus using WFPC2 images obtained over the wavelength range 336-1024 nm during the period September 1996 through January 2002. We will produce broadband spectra and hence colors for each satellite which will address the current discrepancy in the color of Janus. Poulet et al. {1999} found Janus to have a pronounced redness over the wavelength range 0.3 to 0.7 microns, while a recent study by French et al. {2002} found Janus to be more neutral. We will investigate any leading/trailing hemisphere albedo dichotomies. Upon removal of any rotational albedo effects, we will produce the first solar phase curves from data between 0.22 and 6.4 degrees in phase angle, possibly revealing for the first time the existence of narrow opposition surges. In combination with available {Voyager} spacecraft data at higher phase angles, we will produce the most complete phase curves to date for these objects. We will apply the Hapke 2002 photometric equation to these phase curves to relate the physical characteristics of the satellite surface to the observed photometric properties. From these fits to the solar phase angle data we will determine the geometric albedo in each filter, the single scattering albedo, in addition to parameters which characterize the opposition effects due to shadow hiding and coherent backscatter.

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