AST 2011 - Lab 4 - Earth's Orbital Velocity - Intro and Conclusion

AST 2011 - Lab 4 - Earth's Orbital Velocity - Intro and Conclusion

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  Instructor: Kraig Andrews 16 October 2014 Lab Experiment #4: Earth’s Orbital Velocity Introduction: The purpose of this lab was to measure the Doppler shifts about three spectral lines of the K-giant star Arcturus from actual spectrograms. From that, the shifts would be used to calculate Earth’s orbital velocity, the radical velocity of Arcturus with respect from the Sun, and Earth’s distance from the sun. The materials used in this lab were a ruler, a calculator, and the spectrograms on the lab manual. The first thing done in this lab was that the ruler was used to calculate D on the plate scale. Next, the change in d was measured for four lines and then they were multiplied by D to find the change in wavelength A and the change in wavelength B. These values were then subsequently used to find the average values of V EARTH , V STAR , and the distance from the Earth to the Sun. By doing this lab, I hope to learn more about Doppler shifts and radial velocities.
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  • Fall '14
  • KraigAndrews
  • Astronomy, Doppler, Doppler shifts, VEARTH

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