[PPS02-P09] 4-D dust trail calculations of 1998 Bootid outburst and 1972 Giacobinid absence
Keywords:Bootid, Giacobinid, dust trail theory
Also, the 4-D duat trail calculation revealed the mechanism of 1972 Giacobinid. Giacobinid was expected to show the activity in 1972 but almost no activity. This is because that the minimum ejection velocity from the parent comet was 60m/s which is over the sublimation velocity of H2O.