, Background Material
Complete the following sections after reviewing the background pages entitled Introduction,
Doppler Shift, Center of Mass, and ExtraSolar Planet Detection.
Question1: Label the positions on the star’s orbit with the letters corresponding to the labeled
positions of the radial velocity curve. Remember, the radial velocity is positive when the star is
moving away from the earth and negative when the star is moving towards the earth.
A: Transitioning from moving away from Earth, to moving toward Earth
B: Moving towards Earth
C: Transitioning from moving toward Earth, to moving away from Earth
D: Moving away from Earth
Question 2: Label the positions on the planet’s orbit with the letters corresponding to the labeled
positions of the radial velocity curve. Hint: the radial velocity in the plot is still that of the star, so
for each of the planet positions determine where the star would be and in which direction it
would be moving. A: Left of the circle B: Top of the circle C: Right of the circle D: Bottom of the circle
NAAP – ExtraSolar Planets 2/12
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