Sun – Earth System Questions

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Presentation transcript:

Sun – Earth System Questions Understanding Orbits Sun – Earth System Questions 1. Why are the suns rays shown as parallel when reaching the earth? 2. Does the earth have the axis tilted all year long? 3. Does the orbit shown spend any time in the eclipse? SSE-120

Questions 1. What is the estimated inclination for the orbit shown? Understanding Orbits Questions 1. What is the estimated inclination for the orbit shown? 2. What would inclination be for the spacecraft velocity going in the opposite direction? 3. Will the inclination change with increase in altitude? 4. Will the inclination change if the orbit were elliptical? SSE-120

Questions Earth’s rotation around the sun Understanding Orbits Earth’s rotation around the sun Questions 1. Does the eclipse of the earth change with seasons? 2. If there are no disturbing perturbations to the orbit, draw a terminator orbit for each season. 3. Does the terminator orbit differ for each season? SSE-120

Launching a spacecraft Understanding Orbits Launching a spacecraft Questions 1. Does the eclipse of the earth change with orbit altitude? 2. Will they eclipse time of the spacecraft change with an increase in altitude? 3. Does an eclipse occur with a GEO spacecraft? SSE-120

Questions What is the inclination on orbit A? B? C? D? E? Understanding Orbits Questions What is the inclination on orbit A? B? C? D? E? SSE-120

A spacecraft in a terminator orbit Understanding Orbits A spacecraft in a terminator orbit Questions 1. Does the eclipse of a terminator orbit change with orbit altitude? 2. Will the eclipse time of this spacecraft change with an increase in altitude? 3. Does an eclipse occur with a Molniya orbiting spacecraft? SSE-120 SSE-120

Questions 1. Where is the eclipse in this diagram? Understanding Orbits Questions 1. Where is the eclipse in this diagram? 2. What would you consider to determine if this orbit experiences an eclipse over a year? SSE-120 SSE-120

A spacecraft in a noon-midnight orbit Understanding Orbits A spacecraft in a noon-midnight orbit Questions 1. Does the eclipse of this orbit change with a change in altitude? 2. Will the eclipse time of this spacecraft change with an increase in altitude? SSE-120

Understanding Orbits Questions What would be the eclipse time if a spacecraft could orbit at zero altitude? What is the eclipse time for an altitude of 750 km for the noon-midnight orbit? What would be the maximum eclipse time for a 750 km altitude orbit if the inclination was 90 degrees? SSE-120