Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26a...141...94l&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 141, no. 1, Dec. 1984, p. 94-100.
Astronomy and Astrophysics
Astrophysics
17
Aphelions, Comets, Interstellar Matter, Astronomical Coordinates, Spatial Distribution
Scientific paper
The distribution of the aphelia of 223 long-period comets is analyzed with respect to the equatorial, the galactic and the solar apex coordinate system. A systematic north-south asymmetry can at least partly be explained by observational biasing due to a better detection probability for comets in the northern sky. A division of the sample into 3 subgroups according to the semimajor axes shows a different behavior of the more primordial 'new' and 'intermediate' comets on one hand and the 'old' comets with smaller semimajor axes on the other hand. A cluster of 30 primordial comets is located in a small region north of the galactic plane. An explanation for it as an indication of a stellar passage a few million years ago has been given by Biermann et al. (1983). In the same sample, + or - 10 deg belt around the galactic plane is almost void of aphelia. No indication is found for an accumulation of aphelia directly around the antapex.
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