(meteorobs)
Sergey Shanov
shanov-2004 at yandex.ru
Tue Jun 29 22:29:56 EDT 2004
This feature (not perihelion ejections) did not attract attention in case of young trails, however thanking 2004JBO and works Lyytinen, Jeremie, Sato it became for all obvious.
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JUNE BOOTID (IOTA-DRACONID) OUTBURST JUNE 23
An outburst of June Bootid meteors was observed from about
June 22 19h UT until June 24 01h UT (ZHR > 1/hr), peaking at
a rate of ZHR ~ 30/hr at 11?2 h UT, June 23. The meteors wee
mostly yellow in color, and the thre low-resolution spectra
recorded by Peter Jenniskens show a strong sodium line, a weak
magnesium line, and a continuum with a relatively small
contribution from the first positive system of N2.
The event was PREDICTED by Sergey Shanov and Sergey Dubrovsky, and also
STUDIED by Mikiya Sato and Jeremie Vaubaillon, the latter at IMCCE, and
is the result of Earth passing through a cluster of dust trails of
7P/Pons-Winnecke ejected in the returns of 1819, 1825, and 1830. The
theoretical radiant was calculated at RA = 223.0, Decl. = +47.1 (Vg =
14.14 km/s) by Sato.
e.g.: http://kaicho.pobox.ne.jp/tenshow/meteor/7p2004/e1.htm
PERSEID OUTBURST
The next anticipated outburst will occur during this year's
Perseids, when Earth encounters the recent 1862 dust trail.
Esko Lyytinen PREDICTS that the 1862 dust trail of comet
109P/Swift-Tuttle will pass just inside of Earth orbit (at
a distance of 0.0013 AU) when Earth approaches that point
during the upcoming 2004 Perseids. Earth passes the trail
node at solar longitude (2000.0) 139.441 degrees. This occurs
at 11 August 20:54 UT. The outburst will be visible from parts
of Europe and Asia.
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