Which of these planet's synodic period is more than its sidereal period?

Mars

Venus

Jupiter

Mercury

Correct Answer : Mars

Explanation : Mars is the only planet in our solar system whose synodic period is more than its sidereal period. Its sideral period is 687 days whereas its synodic period is 780days. The synodic period is the time taken by the planet or any celestial object to come back to the initial angular position whereas the sidereal period is the time taken by the planet to orbit 360 degrees around the Earth as seen from Sun or any other fixed star.

Recently Updated in Spaceflight Mechanics Questions

What kind of trajectory is obtained if the satellite is launched from a place whose latitude is 30 deg

Arc trajectory

Co-axial trajectory

Coplanar trajectory

Non-coplanar trajectory

Correct Answer : Option (D) : Non-coplanar trajectory

Explanation : Coplanar trajectory only occurs when the launch is at a suitable condition where launch latitude matches the moon’s orbital inclination. This is a rare condition which occurs only at Cape Kennedy whose latitude for launch is 28.5 deg. When launches are done at any other location or when the suitable conditions is not met, it results in non-coplanar trajectory.

Which of these is not a constraint on lunar trajectories?

Phase of the moon

Accuracy tolerance

Launch site location

Rotation speed of the earth

Correct Answer : Option (D) : Rotation speed of the earth

Explanation : There are several constraints which carrying out lunar missions. These include-launch site location, accuracy tolerance, limited range of injection conditions, phase of the moon determining the lighting condition, direction of launch from a site.

What is the right ascension of launch point equal to?

Synodic time

Local sidereal time

East longitude

Greenwich sidereal time

Correct Answer : Option (B) : Local sidereal time