The outermost planets ( Jupiter, Saturn, Uranus, and Neptune ) are so distant that only small portions of their phase curves near 0?( full phase ) can be evaluated from the Earth.
32.
The amplitude curve is a straight line of constant slope 20 \ alpha dB / dec, and the phase curve is a horizontal line at \ frac { \ alpha \ pi } { 2 } rad.
33.
A few direct measurements of the Earth's luminosity have been obtained with the EPOXI spacecraft . While they do not cover much of the phase curve they reveal a rotational light curve caused by the transit of dark oceans and bright land masses across the hemisphere.
34.
The asteroid was imaged by " Ralph " ( use of LORRI was not possible because of proximity to Sun ), which gave the team a chance to test " Ralph " capabilities, and make observations of the asteroid's composition as well as light and phase curves.
35.
Since the phase curve of Venus is relatively flat while its distance from the Earth can vary greatly, maximum brightness occurs when the planet is a crescent, at phase angle 125? at which time Venus can be as bright as magnitude " 4.9 . Near inferior conjunction the planet typically fades to about magnitude " 3 although the exact values depends on the phase angle.
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