An evaluation of phase corrections to planet position measurements

Details An evaluation of phase corrections to planet position measurements An evaluation of phase corrections to planet position measurements

Oct 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26a...139..215c&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 139, no. 1, Oct. 1984, p. 215-219. In French.

Astronomy and Astrophysics

Astrophysics

10

Astrolabes, Astrometry, Astronomical Coordinates, Planets, Correction, Mars (Planet), Planets, Position (Location), Observations, Astrolabe, Procedure, Technique, Light (Visible), Radiation, Intensity, Imagery, Models, Comparisons, Analysis, Telescope Methods, Phases

Scientific paper

Since 1963, the capability of astrolabe for planetary observations, has been fully demonstrated. But, the quality of the results was not as good as those obtained for star or, even, solar observations. This shows that the problem does not come from instrumental errors but, in fact, from an insufficient correction of the phase on observations. The author presents a model of distribution of light intensity and, assuming that the point observed is the photocenter, he computes the corresponding phase corretion. Analysis of Mars observations, compared to the Jet Propulsion Laboratory ephemeris, shows that there is a strong "phase effect" in right ascension. The new phase correction applied to these results gives the best residuals. A comparison of the author's model with Jupiter observations is being made at San Fernando Observatory. Studies of Venus observations will begin soon in Sao Paulo Observatory.

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