# Frequent question: What determines a planets orbital period?

Contents

For celestial objects in general the sidereal orbital period (sidereal year) is referred to by the orbital period, determined by a 360° revolution of one celestial body around another, e.g. the Earth orbiting the Sun, relative to the fixed stars projected in the sky.

## What determines an orbital period?

The time to complete one revolution around the planet depends upon the height of the orbit. … The orbital period of a satellite depends on the mass of the planet being orbited and the distance of the satellite from the centre of the planet.

## What affects a planet’s orbital period?

The size of a planet doesn’t affect its orbital period. The orbital period is only dependent of the planet’s distance from the sun. Mercury is the smallest planet and it also has the shortest orbital period. Earth and Venus are about the same size but Venus has a shorter orbital period as it is closer to the sun.

## Why do planets have different orbital periods?

Planets that orbit closer to the Sun than Earth have shorter years than Earth. Planets that orbit farther from the Sun than Earth have longer years than Earth. This happens for two main reasons. If a planet is close to the Sun, the distance it orbits around the Sun is fairly short.

## How do you find the orbital period of AU?

If the size of the orbit (a) is expressed in astronomical units (1 AU equals the average distance between the Earth and Sun) and the period (P) is measured in years, then Kepler’s Third Law says P2 = a3. where P is in Earth years, a is in AU and M is the mass of the central object in units of the mass of the Sun.

## Does orbital period depend on eccentricity?

A) a planet’s period does not depend on the eccentricity of its orbit. B) a planet travels faster when it is nearer to the Sun and slower when it is farther from the Sun.

## What makes the planet Earth habitable compared to Mars?

So basically, Earth has a dense atmosphere that is rich in oxygen and water vapor, and which is generally warm and conducive to life. Mars, meanwhile, is generally very cold, but can become quite warm at times. It’s also quite dry and very dusty.

## How does gravity affect the orbital period of a planet?

As the planet moves further away in its orbit around the Sun, the gravitational force exerted by the Sun on the planet decreases. If the force exerted on the planet decreases, the planet’s acceleration, proportional to Msun/d2, must also decrease, resulting in a lower orbital speed.

## How does distance influence the orbital period?

There is, however, a relationship between a planet’s distance from the Sun and its period of revolution. … The further away from the Sun it is, the slower the planet’s orbital speed and the longer its path. Both of those factors result in taking longer to make one complete orbit and a planet having a longer year.

THIS IS EXCITING:  What does the color of Uranus and Neptune tell you about their composition quizlet?

## How do planets differ?

Planets have different properties because they are different distances away from the sun, are different sizes, and are made up of different stuff from the earth. Very tiny planets do not have enough gravitational field to keep much of an atmosphere in. … The earth too changes from time to time.

## Why is Pluto not a planet?

Answer. The International Astronomical Union (IAU) downgraded the status of Pluto to that of a dwarf planet because it did not meet the three criteria the IAU uses to define a full-sized planet. Essentially Pluto meets all the criteria except one—it “has not cleared its neighboring region of other objects.”

## How is the Earth different from other planets?

How is Earth different from other planets? It differs from the other planets because it has liquid water on its surface, maintains life, and has active plate movement. It rotates on its axis every 24 hours (a day) and revolves around the Sun every 365 days (a year). The Earth has one moon.

## How do you find orbitals?

The number of orbitals in a shell is the square of the principal quantum number: 12 = 1, 22 = 4, 32 = 9. There is one orbital in an s subshell (l = 0), three orbitals in a p subshell (l = 1), and five orbitals in a d subshell (l = 2). The number of orbitals in a subshell is therefore 2(l) + 1.

## Does orbital period depend on mass?

The period, speed and acceleration of a satellite are only dependent upon the radius of orbit and the mass of the central body that the satellite is orbiting.

THIS IS EXCITING:  You asked: How do I know if I want to be an astronomer?