Astron. Astrophys. Suppl. Ser. 135, 291-297
A. Olech1,2 - M. Gajos1,2 - M. Jurek2
Send offprint request: Arkadiusz Olech,
e-mail: olech@sirius.astrouw.edu.pl
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
Copyright The European Southern Observatory (ESO)