Quote:
Originally Posted by mapuc
I think it's the first time we put a artificiel satellit in the L2 orbit.
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Not quite. There
were five satellites which were at L2, but have since been moved - either to heliocentric orbits (orbiting the Sun), Earth orbit (and then to L1) or otherwise out of the L2 orbit.
There are
currently two other satellites (The ESA Gaia probe and the joint Russian-German high-energy astrophysics observatory) which are at L2. There are at least eight more satellites planned for L2 orbit.
See
this Wikipedia page for more info.