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...0.03, V(1,0) -9.48 or -] 0.02, R(1,0) = -10.16 [+ or -] 0.04 and I(1,0) = -10.28 [+ or -] 0.02. The selected phase angle coefficients of Saturn, in magnitudes/degree, are: [C.sub.B] = 0.022 [+ or -] 0.014, [C.sub.V] = 0.021 [+ or -] 0.008, [C.sub.R] = 0.027 [+ or -] 0.015 and [c.sub.1] = 0.018 [+ or -] 0.011.
Key Words: Saturn, Magnitude, Ring Brightness, Opposition Surge
INTRODUCTION
During late 2005, summaries of two important Saturn studies were published. French and co-workers (1) analyzed Hubble Space Telescope images of Saturn made between 1996 and 2004 and report that Saturn's rings have an opposition surge. The opposition surge is a sharp brightness increase that occurs when an object reaches opposition and is thus in the opposite direction of the Sun as seen from Earth. Salo and co-workers (2) carried out a theoretical study of the opposition surge data of Saturn's rings in visible light and they conclude that most of the B ring's opposition surge is due to a reduction of shadowing of one particle on another. Therefore, these studies show that Saturn's rings become much brighter at opposition. The current study is a continuation of a long-term photometric study of Saturn + rings that began in 1991;...
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