I can recall that one or more of the Apollo moon missions was tasked with photographing the L1 Lagrangian. They were trying to see if there were any objects floating there. I don't remember the outcome.

Marc Vermeersch wrote:

• The Lagrangian points L1, L2, L3 are not stable. A satellite positioned

there would require constant positions corrections: complex satellite. L4 and L5 are stable.

• When n L points are populated and you want to populate another L point,

you have to solve an (n+2)-body problem. This becomes extremely complex.

• L4 and L5 are about the same distance from Earth as the moon: EME type

complications for communications.

http://www.physics.montana.edu/faculty/cornish/lagrange.pdf

http://www.physics.montana.edu/faculty/cornish/lagrange.html

http://en.wikipedia.org/wiki/Lagrangian_point

http://www.esa.int/esaSC/SEMM17XJD1E_index_0.html

-----Original Message----- From: amsat-bb-bounces@amsat.org [mailto:amsat-bb-bounces@amsat.org] On Behalf Of w7lrd@comcast.net Sent: January 12, 2007 08:07 To: amsat-bb@amsat.org Subject: [amsat-bb] Lanrangian points

Hello Amsat'ers Is it possible or practical to have a communications satellite at the L1 or L2 points. 73 Bob W7LRD Seattle _______________________________________________ Sent via AMSAT-BB@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb

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Sent via AMSAT-BB@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb