Realistic gravitational focusing of meteoroid streams

Realistic gravitational focusing of meteoroid streams

ABSTRACT The number density and flux of a meteoroid stream is enhanced near a massive body due to the phenomenon known as gravitational focusing. The greatest enhancement occurs directly opposite the massive body from the stream radiant: as an observer approaches this location, the degree of focusin...

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Bibliographic Details
Published in:Monthly notices of the Royal Astronomical Society Vol. 494; no. 2; pp. 2982 - 2994
Main Authors: Moorhead, Althea V, Clements, Tiffany D, Vida, Denis
Format: Journal Article
Language:English
Published: Oxford University Press 11-05-2020
Subjects:
meteorites
meteors
meteoroids
Online Access:Get full text
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Summary:ABSTRACT The number density and flux of a meteoroid stream is enhanced near a massive body due to the phenomenon known as gravitational focusing. The greatest enhancement occurs directly opposite the massive body from the stream radiant: as an observer approaches this location, the degree of focusing is unbound for a perfectly collimated stream. However, real meteoroid streams exhibit some dispersion in radiant and speed that will act to eliminate this singularity. In this paper, we derive an analytic approximation for this smoothing that can be used in meteoroid environment models and is based on real measurements of meteor shower radiant dispersion.
ISSN:0035-8711
1365-2966
DOI:10.1093/mnras/staa719