Applicability of meteor radiant determination methods depending on orbit type. I. High-eccentric orbits

Details Applicability of meteor radiant determination methods depending on orbit type. I. High-eccentric orbits Applicability of meteor radiant determination methods depending on orbit type. I. High-eccentric orbits

Jul 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993coska..23...23s&link_type=abstract

Contributions of the Astronomical Observatory Skalnate Pleso, vol. 23, p. 23-44.

Astronomy and Astrophysics

Astrophysics

6

Comets, Meteor Streams

Scientific paper

It is evident that there is no uniform method of calculating meteor radiants which would yield reliable results for all types of cometary orbits. In the present paper an analysis of this problem is presented, together with recommended methods for various types of orbits. Some additional methods resulting from mathematical modelling are presented and discussed together with Porter's, Steel-Baggaley's and Hasegawa's methods. In order to be able to compare how suitable the application of the individual radiant determination methods is, it is necessary to determine the accuracy with which they approximate real meteor orbits. To verify the accuracy with which the orbit of a meteoroid with at least one node at 1 AU fits the original orbit of the parent body, we applied the Southworth-Hawkins D-criterion (Southworth, R.B., Hawkins, G.S.: 1963, Smithson. Contr. Astrophys 7, 261). D<=0.1 indicates a very good fit of orbits, 0.10.2 the fit is rather poor and the change of orbit unrealistic. The optimal methods with the smallest values of D for given types of orbits are shown in two series of six plots. The new method of rotation around the line of apsides we propose is very appropriate in the region of small inclinations. There is no doubt that Hasegawa's omega-adjustment method (Hasegawa, I.: 1990, Publ. Astron. Soc. Japan 42, 175) has the widest application. A comparison of the theoretical radiants with the observed radiants of seven known meteor showers is also presented.

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