Book Value Calculation Example
Wednesday, September 14th, 2011
Why is determine mass with 2 objects easier than with one?
I read often astronomical websites and books. Here is stated that the mass of two objects (e.g. planets or stars) in orbit of each can be calculated by just watching their motion. I have read the black hole in the center of the galaxy had a mass of ~4kk solar mass and this number was calculated by some (big) stars revolving it.
So how does this actually work? Take Pluto and Charon for example. For a calculation to work you have to have at least on value, is it not? So how did they calculate Pluto’s mass? And how can Charon enhance the calculation of both masses?
M1+M2= A^3/P^2
M is the masses
A is distance between two masses
P is the orbital period
once they know the orbital period, they can figure out the distance. And if they knoe the distance they can figure out the orbital period. When getting both the orbital period and distance, they can calculate the mass.
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