Barnards star, our nearest neighbor beyond the Alpha Centauri system, has a parallax of 0.55 arc seconds as measured from Earth. Doppler shift measurements show that it is approaching us at the rate of 111 kilometers per second, in addition to the transverse motion discussed in the textbook. How much does the parallax of this star change per year?

0 votes
     about 0.04 arc seconds per year
      about 8.6 x 10-8 arc seconds per year
      about 70 arc seconds per year
      about 2.5 x 10-3 arc seconds per year
      about 3.4 x 10-5 arc seconds per year
asked Sep 20, 2012 in Astronomy by anonymous
    

1 Answer

0 votes
about 3.4 x 10-5 arc seconds per year
answered Sep 22, 2012 by SkyStar ~Expert~ (2,855 points)



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