Astrolabe observations of Mars and the phase effect

Details Astrolabe observations of Mars and the phase effect Astrolabe observations of Mars and the phase effect

Jan 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982crasb.294..191c&link_type=abstract

Academie des Sciences (Paris), Comptes Rendus, Serie II - Mecanique, Physique, Chimie, Sciences de l'Univers, Sciences de la Ter

Astronomy and Astrophysics

Astronomy

2

Astrolabes, Mars (Planet), Phase Shift, Solar Orbits, Correction, Luminous Intensity

Scientific paper

Astrolabe observations of Mars in the periods 1975-1976 and 1977-1978 revealed that classical corrections for phase were inaccurate. New formulations are developed which take into account the optical properties of planetary images. A model for the repartition of the luminous intensity is presented, relying on Lambert's law to define new corrective relations. Curves of equal intensity are assumed to by spherical about an axis joining the planetary surface to the sun. Any projection on a plane normal to the observer is then an ellipse, with axes proportional to the cosine of the phase angle. The method is shown to result in hundredths of arcsecond accuracy when using the astrolabe.

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