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(http://www.imo.net/galleries/calendar/2009/jbo.png)
June Boötids (JBO)
Active: June 22-July 2
Maximum: June 27 08h30m UT (λo = 95°7
ZHR = variable - 0-100+
Radiant: α = 224° δ = +48°
Radiant drift: see Table 6
v∞ = 18 km/s; r = 2.2
TFC: α = 156° δ = +64° and α = 289° δ = +67° (β = 25°-60° N)
This source was reinstated on the Working List after its unexpected return of 1998, when ZHRs of 50-100+ were visible for more than half a day. Another outburst of similar length, but with ZHRs of ~ 20-50 was observed on 2004 June 23, a date before definite activity had previously been recorded from this shower. Consequently, the shower's start date was altered to try to ensure future activity so early is caught, and we encourage all observers to routinely monitor throughout the expected activity period, in case of fresh outbursts. Prior to 1998, only three more probable returns had been detected, in 1916, 1921 and 1927, though that in 1921 was very uncertainly recorded. With no significant reports between 1928 and 1997, it seemed likely these meteoroids no longer encountered Earth. The dynamics of the stream were poorly understood, although recent theoretical modelling has improved our comprehension. The shower's parent, Comet 7P/Pons-Winnecke, has an orbit that now lies around 0.24 astronomical units outside the Earth's at its closest approach. Its most recent perihelion passage was in 2008 September. Clearly, the 1998 and 2004 returns resulted from material shed by the comet in the past which now lies on slightly different orbits to the comet itself. Dust trails laid down at various perihelion returns during the 19th century seem to have been responsible for the last two main outbursts. There were no predictions in force for possible activity in 2009 at the time of writing, but conditions for checking are very favourable from the mid-northern latitudes where the radiant is best seen, with an early-setting waxing crescent Moon. The prolonged - in some places continuous - mid-northern twilight means the summer nights are short anyway. The radiant is usefully accessible virtually all night, and all observing techniques can be employed.
IMO Meteor Shower Calendar 2009 (http://www.imo.net/calendar/2009#jbo)