Refinement of the phase of a spherical planet located at a small distance from the Sun

Details Refinement of the phase of a spherical planet located at a small distance from the Sun Refinement of the phase of a spherical planet located at a small distance from the Sun

Apr 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007sosyr..41..150m&link_type=abstract

Solar System Research, Volume 41, Issue 2, pp.150-161

Statistics

Computation

95.10.Km, 96.30.-T, 96.30.Dz

Scientific paper

Formulas for refining the phase of a spherical planet located a small distance from the Sun are derived. Finite heliocentric distance of the planet results in the formation on its visible disk of the geometric terminator, which is not coincident with the orthographic terminator. The visible disk is assumed to be observed from Earth in orthographic projection. We suggest introducing linear and surface phases for the geometric terminator in accordance with two existing definitions of the phase of a planet. Linear and surface phases of a planet are shown to be given by different sets of formulas. An example of the computation of the phase of Mercury is given.

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