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Astron. Astrophys. 320, 631-641 (1997)

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A stream search among 502 TV meteor orbits. An objective approach

T.J. Jopek 1 and Cl. Froeschlé 2

1 Obserwatorium Astronomiczne Uniwersytetu A.Mickiewicza, Sloneczna 36, PL-60-286 Pozna, Poland
2 Observatoire de la Côte d'Azur, Dept. Cassini, B.P. 229, F-06304 Nice Cedex 4, France

Received 2 October 1995 / Accepted 4 June 1996

Abstract

In the first part of the paper a short review of the computer meteor stream searching techniques is given. Different fractions of the stream component obtained amongst radio, photographic and TV data are partially due to the use of different methods applied in the stream search. A new objective approach is proposed in order to obtain the threshold value [FORMULA] of the orbital similarity corresponding to the probability of chance occurrence of the stream. The 502 Canadian TV data has been used to test this approach. It appears, that the values of [FORMULA] given by Southworth & Hawkins (1963), and Lindblad (1971b) formulae are too high to warrant sufficient reliability of the identified streams. Indeed using these formulae the result is that the probability to obtain by chance at least one stream of 4-5 members goes from 21% to 68%. The effect of the three different distance functions used to measure the orbital similarity (Southworth & Hawkins (1963), Drummond (1979, 1981), and Jopek 1993) has been investigated. For all functions taking the same [FORMULA] reliability level, the number of streams detected is considerably less than in the case of the traditional approach (Jopek 1993a). However, results are different using different distances. Finally, we give the list of the orbits of eight streams identified at the reliability level [FORMULA] using the Jopek distance.

Key words: meteors

Send offprint requests to: A. Kwasniewski, Belweder, Warszawa Tables 6 and 7 are only available in electronic form at the CDS via ftp 130.79.128.5 or http://cdsweb.u-strasbg.fr

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© European Southern Observatory (ESO) 1997

Online publication: June 30, 1998
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