astronomy links

collected by the OSU Astronomy Club .

updated 2003-02-06.


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asteroids, planets, stars, galaxies, comets, etc.


detailed information:


Technical details about telescopes and related ground-based hardware

Space Telescopes

Rockets, Corporations, and other ways of getting from Earth to Elsewhere

Satellites, space stations, and other hardware in space

see also

Orbital Mechanics

I (David Cary) have been told that there are some especially stable points for placing satellites in Earth's orbit, called Lagrange points

You should be able to spot them in these graphs I've made. (Darkest blue == smallest acceleration in a 1 orbit/month circular orbit). There are many other other fairly stable orbits (simple circular orbits; elliptical orbits) other than the ones shown here.

Unfortunately, I have not yet been able to find all 5 Lagrange points in my graphs.

According to the sources below, there are 5 Lagrange points in a 2 body system.

                     L4 (ahead of the secondary)

  L3          (O)      L1  o   L2

                     L5 (following the secondary)

 (O) = primary body
  o = secondary body

L4 and L5 are called Trojan points. I have heard that L1, L2, L3 are points of unstable equilibrium, but L4 and L5 are points of stable equilibrium. Why can't i see them on my graphs ?

DAV wrote these Matlab scripts; they drew the above pictures: ../program/lagrange.m ; ../program/lagrange_graphs.m ; ../program/lagrange_physics.m .

More Lagrange information:

What are frozen orbits ?

More satellite design information, in general. (See also 3d_design.html#spacecraft_design for more futuristic designs ).


misc astronomy links

Started 1998-11-07
Original Author: David Cary
Current Maintainer: David Cary

Send comments, suggestions, bug reports to
David Cary

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