The recently discovered asteroid 2002 NY40 will be making a close
approach August 18-19. Minimum distance based on the first orbit is
0.0036 AU, or about a third of a million miles = half a million kilometers.
The current prediction is for it to get up to about mag. 10. The object
will be moving at some 125 deg/day.
Details can be found here:
http://cfa-www.harvard.edu/mpec/K02/K02O17.html
Remember that because of the close approach, the ephemeris shown in this
MPEC is likely to change drastically in the coming weeks. To actually
find it you'll need an up-to-date ephemeris calculated within a few days
of the close approach. Use the one here only for general planning purposes.
\Brian
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