Re: Asteroids or bust!
From: Hop David (hopspageHATESSPAaMmM_at_tabletoptelephone.com)
Date: 06/04/04
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Date: Thu, 03 Jun 2004 17:45:59 -0700
Perplexed in Peoria wrote:
> A tether that could throw something out of Saturn's gravity well from
> the vicinity of Titan would be something to behold.
At 1.2 million kilometers, Titan isn't deep in Saturn's gravity well.
The hyperbolic excess velocity to get from Titan orbit to Hohmann
insertion is 9.4 km/sec. But since Titan's circular orbit is already 5.4
km/sec, you only need an additional 4 km/sec delta vee.
The brunt of the delta vee expense is slowing down at perihelion to
match velocities with the earth. Earth is moving at 30 km/sec and the
load of nitrogen is moving at about 40 km/sec.
It is a different story if you're exporting Titanian nitrogen to Main
Belt asteroids or Jupiter's Trojans. (Although there may already be
nitrogen sources in those places.)
-- Hop David http://clowder.net/hop/index.html
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