A hummingbird for the L2 lunar libration point
F. O. Vonbun, United States. National Aeronautics and Space Administration, Goddard Space Flight Center
National Aeronautics and Space Administration, 1968 - Artificial satellites - 10 pages
5 pages matching earth-moon axis in this book
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ACCELERATION EXPERIENCED acceleration x ANGLE BETWEEN EARTH-MOON angular speed antenna beam axis see Figure barycenter cm sec cm sec"2 craft distance dyne earth acceleration earth-moon axis earth-moon line earth-moon system F. O. Vonbun Goddard far-side lunar fuel-to-spacecraft-mass ratio Goddard Space Flight Greenbelt high specific impulse hovering Hummingbird Integrating Equation ion engines Journal of Spacecraft keep the spacecraft L2 libration point lifetime Lunar Communication lunar L2 libration LUNAR LIBRATION POINT lunar month magnitude mass point moon moon's NECESSARY SPECIFIC IMPULSE needed for station needed to keep occultation orbiting spacecraft POINT By F. O. point L2 radians sec-1 ratio mf/mo Reference rsincp)2 satellite position vector seen from Figure shown in Figure small accelerations Space Flight Center Spacecraft and Rockets spacecraft mass spacecraft must rotate station keeping station-keeping requirements sun's influence Thrust levels total spacecraft tracking station tremely small unit vector Varying Equation Vonbun Goddard Space