By IMO - International Meteor Organization
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Extra resources for WGN Vol. 37, No. 1, February 2009
Bull. Astron. Inst. , 40, 53–63. Handling Editor: Javor Kac Figure 3 – Evolution of train between 06h 01m 20s and 06h 05m 52s UT. WGN, the Journal of the IMO 37:1 (2009) 39 Preliminary results Results of the IMO Video Meteor Network — November 2008 Sirko Molau 1 and Javor Kac 2 The cameras of the IMO Video Meteor Network operated on all 30 nights in 2008 November. We collected more than 2 200 hours of effective observing time and recorded more than 9 000 meteors. Preliminary analysis of the 2008 Leonids is presented.
The activity interval, on the other hand, agrees well with the value from literature. The Handbook lists an interval of December 12 to January 23 (with a maximum near December 20), whereas the radiant was well observed between December 9 and January 27 in the video data. Also the calculated velocity (64 km/s) is in good agreement with the Handbook (65 km/s). Figure 9 shows the activity profile derived from the video data, which confirms the maximum occurs on De- References cember 20. The profile is less pronouned than that of Molau S.
The radiant is well defined all the time (Figure 3), from which we can conclude that the extended activity interval is real. The radiant is found about a degree north of the position given in the IMO handbook. Between solar longitude 235◦ and 237◦ , the longterm activity profile of the Leonids (Figure 4) is shaped by the different meteor storms of the last decade. More reliable are the values away from the maximum, which confirm a roughly symmetric activity profile. 3 α Monocerotids Right after the Leonids, the α Monocerotids become active, whereby ‘active’ is a relative term.