Statistics – Computation
Scientific paper
May 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010dda....41.0904b&link_type=abstract
American Astronomical Society, DDA meeting #41, #9.04; Bulletin of the American Astronomical Society, Vol. 41, p.935
Statistics
Computation
Scientific paper
The Oort Cloud can be considered a spherical shell having an inner radius of about 20000 AU. Cometary material scatters within this shell until a small fraction of the population has perihelia in the region of the outer planets. We can suppose that, during the final revolution before discovery, galactic tides take sufficient angular momentum out of a comet's orbit to reduce the perihelion distance so that it is inside Jupiter's orbit.
In 1996, Matese and Whitmire presented a striking plot showing a strong modulation in galactic longitude in the distribution of the 83 cometary orbits of quality classes 1A and 1B available at that time. The modulation in longitude was strange, because the predicted effect, due to the galactic disk, allows only for modulation with galactic latitude. Since 1996 the number of high-quality orbits has more than doubled. In this poster we retrict the computations to the 199 quality-class 1A orbits currently available and show that the effect of a strong radial galactic tide persists.
Bartlett David F.
Marsden Brian G.
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