Mastering Spacecraft Attitude Control

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Questions and Answers

Which mission did NASA lose due to a math boo-boo?

  • Jupiter Space Probe mission
  • Saturn Space Telescope mission
  • Mars Rover mission
  • Mars Climate Orbiter mission (correct)

What was the cost of the mission that NASA lost?

  • $100 million
  • $200 million
  • $500 million
  • $327 million (correct)

Which year did the Mars Climate Orbiter launch?

  • 2000
  • 1996
  • 1999
  • 1998 (correct)

What was the weight of the Mars Climate Orbiter?

<p>638 kilograms (B)</p> Signup and view all the answers

How many course corrections were performed during the mission?

<p>4 (A)</p> Signup and view all the answers

What is solar pressure?

<p>The momentum of the massless photons exerting pressure on a spacecraft (A)</p> Signup and view all the answers

According to the text, what caused the Mars Climate Orbiter mission to fail?

<p>Software misinterpretation of thruster firing data (C)</p> Signup and view all the answers

What unit of measurement was mistakenly used by the software?

<p>Pound-seconds of force (A)</p> Signup and view all the answers

What was the calculated altitude at which the spacecraft was supposed to encounter Mars?

<p>226 kilometers (B)</p> Signup and view all the answers

Which unit of measurement was incorrectly used by the spacecraft in its reports to the ground station?

<p>Pound seconds (A)</p> Signup and view all the answers

What was the factor by which the reported results of the spacecraft's desaturation maneuvers were off?

<p>4.45 times (C)</p> Signup and view all the answers

Why was the trajectory calculated by the guidance team incorrect?

<p>The units used in the calculations were incorrect (C)</p> Signup and view all the answers

What could have prevented the error in the spacecraft's trajectory calculations?

<p>Using the correct units in the calculations (C)</p> Signup and view all the answers

During a desaturation maneuver or correction burn, NASA records the exact impulse and time every thruster fired. What is the purpose of this?

<p>To calculate the spacecraft's trajectory changes (D)</p> Signup and view all the answers

How does Mission Control track the spacecraft's trajectory in deep space?

<p>By Doppler shift (D)</p> Signup and view all the answers

What is the purpose of the Hohmann transfer burn?

<p>To send the spacecraft on its way to Mars (B)</p> Signup and view all the answers

Why did the navigation team notice a discrepancy in the observed trajectory after the Mars Orbital Insertion burn?

<p>The spacecraft's altitude was measured in the wrong unit (B)</p> Signup and view all the answers

What altitude did the spacecraft encounter Mars at?

<p>The spacecraft encountered Mars at 57 kilometers in altitude instead of the calculated 226 kilometers.</p> Signup and view all the answers

What lesson can be learned from the Mars Climate Orbiter mishap?

<p>The mishap serves as a humbling reminder that even brilliant minds can make errors and overlook trivial problems.</p> Signup and view all the answers

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