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The parallax of Reiltas has been measured to be 0.285 arcseconds. What is the distance to...

The parallax of Reiltas has been measured to be 0.285 arcseconds.

  1. What is the distance to Reiltas in parsecs? in light-years?
  2. Suppose Reiltas' parallax was re-measured by the new Satellite for Parallax Accuracy Measurements (SPAM) to be 0.275 arcseconds. Is Reiltas closer or farther than previously determined? Explain your reasoning.
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Answer #1

D(In parsec) = 1/(in arcsecond)

a) distance = 1/0.285 = 3.5087 parsec

in light year = 3.5087*3.26156 = 11.443 light year

b) at 0.275 arcseconds

D = 1/0.275 = 3.6363parsec =3.6363*3.26156 = 11.86 light year

so it is farther than previously determined distance

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