blart,
The ME-L1/EM-L2 is about as "lunar centric" of an orbit as it gets.

Although fully interactive in a good sort of way, this mutual
gravity-well offers us one heck of an energy efficient 'sweet spot'
worth of a parallel satellite parking zone for the future LSE-CM/ISS,
that's getting just downright nifty and about as easy for keeping an
eye upon as it gets.

Most everything necessary for establishing and maintaining this
station-keeping position can be effectively managed via terrestrial
ground-control. Hell bells folks, this could even be a 4H club amateur
science project, along with the right software and just a dial-up
internet connection should be sufficient for most any PC to manage the
entire station-keeping requirements and of accomplishing all sort of
Earth/moon related science. All that this sort of platform needs to
incorporate is a good Rn breeder reactor, whereas Ra226--Rn222, thus
LRn gets briefly stored and then LRn--Rn--ion thrust seems like a
win-win sort of reliable form of ion thrust for managing this platform
like a slow-motion ping pong ball within this interactive ME-L1/EM-L2
zone.

Could yourself or perhaps from others contributing their expertise
suggest as to exactly where that nullification zone is at any given
time within the cycle of our moon, as having to orbit along with the
somewhat off-centered and rotating Earth influence while also having to
deal with the sun and, of every 19 months having another pull
contributed by Venus just for keeping things a bit interesting. Upon
average at the Earth/moon distance of 384,400 km it's supposedly
located at roughly 60,000 km off the lunar deck, or 16% of the distance
away from the moon, although that may or may not be the case.

BTW; That's only a five body equation if we're having to include
anything as for the satellite platform mass. It becomes a 6 body
equation if having to include the lunar anchored tethers and, it gets
into a 7+ body equation if there's a tether dipole element involved. Of
course, there could also be a few interactive variables as to various
automated/robotic items associated along with the LSE-CM/ISS, in which
case a CRAY super-computer might have to get involved.

Brad Guth
~

Life upon Venus, a township w/Bridge & ET/UFO Park-n-Ride Tarmac:
http://guthvenus.tripod.com/gv-town.htm
The Russian/China LSE-CM/ISS (Lunar Space Elevator)
http://guthvenus.tripod.com/lunar-space-elevator.htm
Venus ETs, plus the updated sub-topics; Brad Guth / GASA-IEIS
http://guthvenus.tripod.com/gv-topics.htm