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Re: Space Geography

From: Indy <indy.kochte@g...>
Date: Fri, 23 Sep 2011 14:18:21 -0400
Subject: Re: Space Geography

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On Fri, Sep 23, 2011 at 2:08 PM, Samuel Penn <>

> On Friday 23 September 2011 14:30:28 Indy wrote:
> > On Fri, Sep 23, 2011 at 9:23 AM, Samuel Penn <>
> wrote:
> > > [...]
> [...]
> > (1) - one way around this is to set up a handful (3-4 minimum) of
> > detectors in polar orbit around the Sun.
> How about sticking them in the same orbit as the main world, at
> the 3 Lagrange points (L3, L4, L5)? That would give similar coverage
> I would have thought.

It would be difficult to have a direct comms link with the L3 sensor
the primary would be directly interposed. Either L4 or L5 would have to
relay, and if one (or both!) of them is down...

In a polar orbit, with 3 satellites, at least two of them will be out of
ecliptic plane at any one time, and able to look 'down' (or 'up') to see
entirety of the ecliptic plane (assuming one is concentrating toward the
plane for an invading force; elsewise the sensors should be basically
Also, while above/below the ecliptic plane, the sensors could have
comms to the main world.

If one of the polar sats is offline for some reason, you still get some
pretty good coverage of the system as the crossing-the-ecliptic plane
satellite will only be there for a short bit. And can see any blind
the out-of-the-ecliptic plane satellite can't. If two of the polar sats
offline, the primary will be the blind spot in the whole detection
but depending on the orbital parameters of the sensor satellites, any
direction could be blind for a fairly minimal time (an invading fleet
have to either be very lucky or VERY exacting in their arrival vector
timing to be in the blind spot).


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