Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001mnras.327..623g&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 327, Issue 2, pp. 623-628.
Astronomy and Astrophysics
Astronomy
6
Methods: Data Analysis, Meteors, Meteoroids
Scientific paper
In order to determine stream structure within the meteoroid orbital dust cloud, which may help in our understanding of progenitor comet and asteroid bodies, a method involving dissimilarity functions called D-criteria must be used. It is important to understand the response of these criteria to particular orbital orientations. Simulations are performed to determine the applicability of four D-criteria functions in retrieving meteor stream members, with due regard for sporadic background intrusion, in radar detected data sets. The AMOR data set is used as a particular example of the latter. It is found that the Southworth & Hawkins' criterion (DSH) performs satisfactorily but requires quite different cut-off levels depending on the orbital inclination angle of the stream. Valsecchi et al.'s criterion (DN) performs more evenly over different prograde orbital orientations. The modifications to DSH proposed by Drummond (DD) and Jopek (DH) are also explored. For low prograde inclination (i<10°) streams DSH=0.09, DH=0.1, DD=0.06, DN=0.08 cut-off levels are found to retrieve 70 per cent of a simulated stream. For higher prograde inclination (10<=i<90°) streams DSH=0.12, DH=0.16, DD=0.11, DN=0.09 cut-off levels are used. For retrograde orbits DD=0.18 and DN=0.17 are found to retrieve 70 per cent of the members in the case of three retrograde streams studied. DSH and DH require such high cut-off values, especially in the case of the η Aquarids, that a value is not listed here.
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