The photometric center of the Gegenschein

Details The photometric center of the Gegenschein The photometric center of the Gegenschein

Aug 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981icar...47..265m&link_type=abstract

Icarus, vol. 47, Aug. 1981, p. 265-269. USAF-supported research;

Astronomy and Astrophysics

Astronomy

4

Astronomical Photometry, Backscattering, Density Distribution, Gegenschein, Interplanetary Dust, Light Scattering, Astronomical Maps, Astronomical Models, Brightness Distribution, Computer Techniques, Spatial Distribution

Scientific paper

Model calculations are employed to assess two factors that determine the position of the photometric center of the Gegenschein: (1) the increased scattering efficiency of the interplanetary dust near backscattering (at scattering angles of 165 to 180 deg); and (2) the spatial density distribution of the dust. Computer-generated brightness contours are used to examine which of these two factors dominates. It is found that the effect of the enhanced scattering of light by dust in the backscattering region is more important than the effect of the spatial density distribution of the dust. This means that the photometric center should be observed at the antisolar point at all times, except possibly when the antisolar point is at its maximum displacement from the symmetry plane.

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