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Meteoritics & Planetary Science 34, 975--978 (1999) [1999 November issue] fl Meteoritical Society, 1999.

Summary: Meteoritics & Planetary Science 34, 975--978 (1999) [1999 November issue]
fl Meteoritical Society, 1999.
Variation of Leonid maximum times with location of observer
R.H. McNAUGHT 1 and D.J. ASHER 2\Lambda
1 Siding Spring Observatory, Coonabarabran, NSW 2357, Australia
2 Armagh Observatory, College Hill, Armagh, BT61 9DG, UK
\Lambda Correspondence author's e­mail address: dja@star.arm.ac.uk
(Received 1999 June 29; accepted in revised form 1999 August 25)
(Part of a series of papers on the 1998 Leonid shower)
A time adjustment from the Earth's centre to the observer's location is quantified and shown to improve
the residuals between the observed time of pronounced Leonid showers and the time calculated from
perturbed dust trails. A correlation with the exact time of closest approach to the nominal dust trail
orbit would allow a further improvement in the residuals. However, there is no evidence for such a
correlation, suggesting that the dust trail cross section is substantially elongated within the orbital plane.
These results indicate that approaches to dust trails within 0.0005 AU are predictable with an uncertainty
of around 5 minutes. Application of this correction to satellites confirms the utility of two strategies to
minimise the impact risk. The time adjustment could be applied to any meteor stream.
1 Introduction


Source: Armagh Observatory


Collections: Physics