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What is the magnitude of the proper motion in tau Leonis

stated to 2 decimal
precision for the calculated magnitudes of proper
motion.
Using Equation 1.10, Tau Sco has a magnitude of
proper motion of
μ² = (μα+)² + (μs) ²
16.851
10.756
μ = ((989)² + (-23)
1/2
-1
mas y-¹

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