On Thu, 1 Aug 2002 [EMAIL PROTECTED] wrote:
> << If you're talking about a flyby as the asteroid passes -- so the probe
> just needs to be in the right near-Earth place at the right time -- then a
> reasonable rule of thumb is to take an orbital delta-V and add 3km/s.
>
> Ditto for close ones. Maybe add another km/s to catch pop-ops outside the
> Moon's orbit...
If you get modest advance warning, you need very little beyond escape
velocity, because even a very slight excess at injection altitude
translates to quite a bit after escape. (For example, escape plus 50m/s
near Earth leaves you heading out at over 1000m/s after escape, which
puts you far beyond the Moon in a week.)
You need large excesses only if it's very short notice and you really need
to cover the distance to the rendezvous point quickly. (An extra 1km/s
near Earth translates to nearly 5km/s after escape, which puts you beyond
the Moon in less than a day.)
Henry Spencer
[EMAIL PROTECTED]
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