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Ian
Love your work up there in Nhulunbuy, I would like to get up there one day.
Anyway, 4 comets in a year. Maybe I'm wrong, but this could be easily explained by the statistics of small numbers, things that don't happen often. When you are looking at things that happen infrequently, it is not unusual to have a period of time in which nothing happens, or to have a sudden spike in numbers. This is a possible reason for so called "cancer clusters" and potentially also for "comet clusters". For example, if something was to happen 10 times a year in Australia, it would not be surprising to see 4 episodes in a single month and then see very few or no episodes for the next few months.
Just my thoughts
Stuart
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