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One star (BZ2) is observed to be moving in an edge-on circle around the central mass....

One star (BZ2) is observed to be moving in an edge-on circle around the central mass. From the Doppler effect, its speed is measured to be 89000 km/s. And when passing in front of the central mass, it has an apparent side-ways speed of 3 arcsec per (Earth) year. Use these numbers to calculate the distance from the planet to the centre of the central mass (in parsecs):

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