How Far is Mars from the Sun?

by Fraser Cain on June 4, 2008

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What is the distance from Mars to the Sun?



Like the rest of the planets in the Solar System, Mars travels an elliptical orbit around the Sun. This means that it has a closest point to the Sun in its orbit as well as a distant point.

When an object reaches the closest point in its orbit, astronomers call this “perihelion”. The perihelion for Mars is 207 million km, or 1.38 astronomical units (1 AU is the average distance from the Earth to the Sun).

The most distant point on an orbit is called aphelion. The aphelion for Mars is 249 million km, or 1.67 AU.

The average distance from Mars to the Sun is 228 million km, or 1.52 AU. Astronomers call this the semi-major axis.

Mars actually has the second most eccentric orbit of all the planets in the Solar System, right after crazy Mercury. The wide ranging distances have a significant impact on its seasons. When Mars is at perihelion, its southern hemisphere is tilted towards the Sun, and can heat up much more than when its northern hemisphere is experiencing summer.

The dust storms that can rage across the entire planet usually get going when the distance from Mars to Sun is the smallest.

Here’s an article that gives the distance from all the planets to the Sun. And no, Mars isn’t getting so close that it will look as big as the Moon in the sky.

Astronomy for beginners teaches you how to calculate the distance to Mars. And here’s more information about the distance to Mars.

Finally, if you’d like to learn more about Mars in general, we have done several podcast episodes about the Red Planet at Astronomy Cast. Episode 52: Mars, and Episode 91: The Search for Water on Mars.

About 

Fraser Cain is the publisher of Universe Today. He's also the co-host of Astronomy Cast with Dr. Pamela Gay.

sarah October 7, 2008 at 4:28 PM

The distance of of mars to sun 228 kilometer.

jaychyann January 5, 2009 at 9:50 AM

So Is It 228 million km.
Or just 228 km.
?

jaychyann January 5, 2009 at 9:50 AM

Yo.
This is confusing

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