Astron. Astrophys. Suppl. Ser. 135, 291-297
A. Olech1,2 - M. Gajos1,2 - M. Jurek2
Send offprint request: Arkadiusz Olech,
1 - Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warszawa, Poland
2 - Comets and Meteors Workshop, ul. Sokolicz 3/59, 01-508 Warszawa, Poland
Received June 23; accepted November 6, 1998
We present a comprehensive study of a possible -Cygnid meteor shower. Based on visual and telescopic observations made by Polish observers we estimate basic parameters of the stream. Activity of -Cygnids lasts from around June 30 to July 31 with clear maximum near July 18 (solar longitude ). Maximal Zenithal Hourly Rates (ZHRs) are equal to . The structure of the radiant analyzed by RADIANT software is most compact for geocentric velocity of the events equal to 41 km s-1, and for the drift of the radiant (in units /day) equal to . Center of the radiant for the moment of maximum is . We derive population index r equal to from magnitude distribution of 738 possible members of the stream. Comparing the velocity distributions of 754 possible -Cygnids and 4339 sporadic events by and Kolmogorov-Smirnov tests we conclude that both distributions are different with a probability very close to 1.0.
Telescopic observations strictly confirm the results obtained from visual observations. The smallest values of parameter were obtained for the geocentric velocity equal to 40 km s-1 and for the drift of the radiant (in units /day) equal to . The center of the radiant for moment of maximum is .
In spite of making many photographic exposures we still have no photographic or video confirmation of the existence of this stream.
Key words: meteoroids, meteors -- interplanetary medium
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