A planet of mass 'm' moves in an ellipti...

A planet of mass 'm' moves in an elliptical orbit around an unknown star of mass 'M' such that its maximum and minimum distances from the star are equal to `r_1` and `r_2`respectively. The angular momentum of the planet relative to the centre of the star is

`msqrt((2GMr_1 r_2)/(r_1 + r_2))`

`msqrt((2GM(r_1 + r_2)/r_1 r_2)`

`msqrt(((2GMr_1 /r_1 + r_2))r_2`

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