A binary star in our galaxy, Sirius, is 2.64 parsecs away from us. What is the parallax angle in arcseconds for this binary star?
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From the ground, the smallest measurable parallax is p = 0.01 arcsec (corresponding to a distance d = 100 parsecs = 326 light years).
From a satellite, the smallest measurable parallax is p = 0.002 arcsec (corresponding to a distance d = 500 parsecs = 1600 light years).
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