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Book Review: Mission Today -- Reflection from an Ignatian Perspective
A review of Mission Today -- Reflection from an Ignatian Perspective by Michael Amaladoss
Three-body resonance in meteoroid streams
Mean-motion resonances play an important role in the evolution of various
meteoroid streams. Previous works have studied the effects of two-body
resonances in different comets and streams. These already established two-body
resonances were mainly induced either by Jovian or Saturnian effects but not
both at the same time. Some of these resonances have led to spectacular meteor
outbursts and storms in the past. In this work, we find a new resonance
mechanism involving three bodies -- i.e. meteoroid particle, Jupiter and
Saturn, in the Perseid meteoroid stream. Long-term three-body resonances are
not very common in real small bodies in our solar system although they can
mathematically exist at many resonant sweet spots in an abstract sense in any
dynamical system. This particular resonance combination in the Perseid stream
is such that it is close to the ratio of 1:4:10 if the orbital periods of
Perseid particle, Saturn and Jupiter are considered respectively. These
resonant Perseid meteoroids stay resonant for typically about 2 kyr. Highly
compact dust trails due to this unique resonance phenomenon are present in our
simulations. Some past and future years are presented where three-body resonant
meteoroids of different sizes (or subject to different radiation pressures) are
computed to come near the Earth. This is the first theoretical example of an
active and stable three-body resonance mechanism in the realm of meteoroid
streams.Comment: 12 pages, 12 figures, 3 tables; Accepted in MNRA
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