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Consider two Earth orbits lying in the same orbital plane. Orbit 1 has an eccentricity0<e1<1and semi-major axisa1. Orbit 2 has an eccentricitye2=0and semi-major axisa2. - Derive an expression for time it would take to perform most efficient impulsive transfer. - Estimate specific impulse (i.e., find an expression) for this transfer, if it is known that mass ratiomfmi=N, wheremiis mass of the spacecraft before the transfer andmfis the mass of the spacecraft after the transfer.

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