The Giacobinid Meteor Stream

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Abstract
An account is given of the radio echo observations of the return of the meteor shower associated with Comet Giacobini-Zinner during the daytime on 1952 October 9. At this time the Earth was at the node 193 days before the comet. The duration of the shower was only 3 hours, thus showing the same short period characteristics of the great meteoric storms associated with the 1933 and 1946 returns. In 1953 October the Earth was at the node 172 days after the comet but no shower was observed. An interpretation of the factors influencing the occurrence of a meteor shower from the comet is given, and it is suggested that all the results can be explained if perturbations have increased the perihelion distance of the meteors in front of the comet relative to those behind. On this basis a discussion is given of the possibility of observing the shower again in 1958 to 1960. A comment is also made on a recent analysis of the visual, photographic and radio echo observations of the 1946 shower which indicate that a separation of meteor masses may have occurred.

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