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Chapter 5. Planetary Orbits

      90° true anomaly always occurs.
      an orbiting spacecraft crosses the planet's equatorial plane going north.
      180° true anomaly always occurs.
      an orbiting spacecraft crosses the semimajor axis going north.



      retrograde.
      geosychronous.
      prograde.
      high inclination.



      always a polar orbit.
      always a walking orbit.
      never a precessing orbit.
      convenient for many science observations.



      always a polar orbit.
      more a controlled drift than a classical orbit.
      associated with a Lagrange point.
      associated with a Laplace point.





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SECTION I  
ENVIRONMENT
 1 The Solar System
2 Reference Systems
3 Gravity & Mechanics
4 Trajectories
5 Planetary Orbits
6 Electromagnetics

SECTION II
FLIGHT PROJECTS
 7 Mission Inception
8 Experiments
9 S/C Classification
10 Telecommunications
11 Onboard Systems
12 Science Instruments
13 Navigation

SECTION III
FLIGHT OPERATIONS
 14 Launch
15 Cruise
16 Encounter
17 Extended Operations
18 Deep Space Network