Correct Answer : 149,597,871 km
Explanation : Since the distances in heliocentric orbits are very large, the distances are referred in terms of AU (Astronomical unit) rather than kilometers. 1AU = 149,597,871 km.
Correct Answer : Option (C) : Elliptic
Explanation : In the heliocentric phase of the patched conic method, the spacecraft follows the elliptical transfer orbit where sun is considered as the primary gravitational body. The interplanetary cruise is analyzed by two-body mechanics in heliocentric0ecliptic coordinate frame.
Correct Answer : Option (C) : Ratio of perturbing acceleration and central-body acceleration
Explanation : According to Laplace, Sphere of Influence (SOI) is described as the ratio of perturbing acceleration and central-body acceleration.
Correct Answer : Option (A) : Hyperbolic
Explanation : The arrival trajectory inside the target planet’s sphere of influence is done using a hyperbolic orbit which is analyzed in inertial planet-centered frame. As soon as the spacecraft enters the target planet’s sphere of influence, the sun’s gravity is turned off and planet’s gravity is turned on.
