Aphelion clustering of "new" comets: Star tracks through Oort's cloud.

  title={Aphelion clustering of "new" comets: Star tracks through Oort's cloud.},
  author={L. Biermann and W. Huebner and R. L{\"u}st},
  journal={Proceedings of the National Academy of Sciences of the United States of America},
  volume={80 16},
An explanation is proposed for the observed and often discussed clustering of long-period comet aphelia on the sky. Poisson and several multinomial distributions are applied to the most conspicuous cluster, considering only the 80 "new" and 59 "intermediate" comets with the best-determined orbits. The observed number of aphelion points in adjacent areas in two tests with 24 and 36 equal sky areas, respectively, shows a large deviation from a random distribution. The expected probability… Expand
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