Meridian observations of planets with a photoelectric multislit micrometer

Details Meridian observations of planets with a photoelectric multislit micrometer Meridian observations of planets with a photoelectric multislit micrometer

May 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977a%26a....57...55l&link_type=abstract

Astronomy and Astrophysics, vol. 57, no. 1-2, May 1977, p. 55-72.

Astronomy and Astrophysics

Astronomy

26

Astronomy, Electrophotometers, Error Analysis, Micrometers, Planets, Jupiter (Planet), Light Curve, Mars (Planet), Mercury (Planet), Position (Location), Venus (Planet)

Scientific paper

Errors involved in multislit-micrometer observations of planets due to their finite apparent diameters are studied with particular reference to photoelectric meridian observations of Mars, Jupiter, and Saturn. The photocenter of an extended asymmetric image is defined, the theoretical phase displacement of the photocenter of a sphere or spheroid with a homogeneous scattering surface is analyzed, and the effect of surface markings on phase corrections is investigated. A formula is derived by which the magnitude of this effect can be estimated from the amplitude of a rotational light curve, and special problems associated with observations of Mercury, Venus, Mars, Jupiter, and Saturn are discussed. Results of photoelectric multislit-micrometer meridian observations of Mars, Jupiter, and Saturn are reported, reduction procedures are outlined, and final phase corrections are determined. The effect of nonlinear photometric response is evaluated along with clamp corrections and the mean number of errors per observation.

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