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Chapter 4. Interplanetary Trajectories

How Orbits Work


      Remove energy from its existing solar orbit.
      Add energy to its existing solar orbit.
      Place it in solar orbit.
      Change its aphelion.



      is always a Type-II orbit.
      always uses gravity assist.
      is always a Type-I orbit.
      permits efficient use of propellant.



      departs the planet faster than it arrives, as seen from the planet.
      must fly slower than the planet's escape velocity.
      tugs on the planet via gravity.
      changes the planet's orbital energy.






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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