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What characteristics of the orbiting stars do we need to measure in order to calculate the mass of the central object, sgr a*?

What characteristics of the orbiting stars do we need to measure in order to calculate the mass of the central object, sgr a*?
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What characteristics of the orbiting stars do we need to measure in order to calculate the mass of the central object, sgr a*?

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User Martin Cazares
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In order to calculate the mass of the central object, sgr a*, we need to measure two characteristics of the orbiting stars.

These two characteristics are:
1- their orbital period
2- average orbital distances


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User Pakka Pakka
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