[meteorite-list] Draconids - Part 2 of 2
From: Bernd Pauli HD <bernd.pauli_at_meteoritecentral.com>
Date: Thu Apr 22 09:37:33 2004 Message-ID: <3A337878.85F818AE_at_lehrer1.rz.uni-karlsruhe.de> Sky & Telescope, October 1986, p. 324: Draconid Meteor Show? The Draconids may be very intense on October 8th or 9th of this year. This meteor shower, also called the Giacobinids, is associated with Comet Giacobini-Zinner and has put on spectacular shows in 1933 and 1946. In those cases, Earth encountered material that was both behind the comet and inside its orbit. In 1985, Japanese observers reported significant activity, with rates briefly attaining several hundred Draconids per hour. However, I believe the main concentration was missed, and that 1986 offers a better chance for a great shower, even though the Earth is farther from the comet. Depending on a number of assumptions, Earth may cross the debris stream between 19.2 hours Universal time on October 8th and 10.7 hours on the 9th. The radiant should be near the head of Draco. This is an evening shower and must be observed shortly after sunset, even though a Moon just one day before first quarter will interfere to some extent. The stream is famous for bright meteors. If this prediction holds, the shower may be visible from northern South America and Europe, North America, and Hawaii. I would appreciate receiving reports of this event and will send all contributing observers a final report of the results. Ignacio Ferrin Apartado 700 Merida 5101-A, Venezuela -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.- Sky & Telescope, December 1987, p. 658: Intense meteor shower A few times this century meteors have rained from the heavens. Take, for example, the October 9, 1933 and 1946, Giacobinid showers, when, for an hour, tens of thousands of meteors could be seen pouring from the head of Draco. Although similar activity was anticipated every 13 years since the 1946 display, it had not recurred. Now visual data from the Nippon Meteor Society (NMS) in Japan point to a meek revival of the Giacobinids in 1985. After analysing observations from 50 individuals and 10 groups who participated in its Giacobini Project, the NMS estimates that the time of maximum activity was October 8th at about 10h 10m UT. Around that time, an average of 154 meteors fell from the sky per hour, and one count was 325 meteors per hour. To confirm that these meteors were indeed Giacobinids, the NMS used a pair of photographs of the same meteor and calculated its orbital elements. Its orbit matched that of Comet Giacobini-Zinner, the shower's parent body. Several NMS members determined the shower's radiant position visually and photographically. But by far the most accurate measurement came from a TV camera. The result - right ascension 17h 34m, declination 55°.8 (1950.0) - was 2° from the shower's predicted radiant. The NMS's full report appears in the journal Icarus, Vol. 70, pages 138-145. Best Sunday wishes, Bernd Received on Sun 10 Dec 2000 07:35:04 AM PST |
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