  Uranus is fainter when the Sun and Earth are near its equatorial plane than
when they are near the projection of its poles. The average of the absolute
values of the sub-Earth and sub-Sun latitudes (referred to as the sub-latitude
here) is used to quantify this dependency. The rates of change of magnitude
with sub-latitude for four of the Johnson-Cousins band-passes are B-band, -0.48
+/- 0.11 milli-magnitudes per degree; V-band, -0.84 +/- 0.04 ; R-band, -5.33
+/- 0.30; and I-band -2.79 +/- 0.41. Evaluated over the range of observed
sub-latitudes, the blue flux changes by a modest 3% while the red flux varies
by a much more substantial 30%. These disk-integrated variations are consistent
with the published brightness characteristics of the North and South Polar
Regions, with the latitudinal distribution of methane and with a planetary
hemispheric asymmetry. Reference magnitudes and colors are also reported along
with geometric albedos for the seven Johnson-Cousins band-passes.
