What Telescope Size Do I Need to See Mars?

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The telescope size you need to see Mars depends on what type of observer you are. A 4” – 6” telescope is fine for beginners/ casual observers, while a 6” – 8” is suitable for intermediate observers. Advanced observers who want to see more details need a telescope that’s 8” or larger.

The universe is fascinating, and Mars is one of the planets that makes it so. The planet is named after the Roman god of war because of its bloody red tone.

We can observe Mars from our home here on Earth. People who have been privileged to observe Mars are always amazed and intrigued by the red planet.

However, the experience of observing Mars is dependent on many factors, including the size of the telescope you use. With the wrong telescope, Mars could appear as an uninspiring red dot in the sky. But with the right telescope, it would be a spectacular red world.

In this article, we’ll answer the question, “what size telescope do I need to see Mars for the best results?” The discussion will reveal recommended telescope size for Mars observation and more.

Let’s get started!

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Intermediate observer: 6 – 8 inches

Intermediate observers always want to see more noticeable dark features on the red planet, making a 6 – 8 inches telescope more suitable.

With an aperture range of 6 – 8 inches, the red color of Mars is more pronounced, and the polar ice caps are clearer and bigger. You’ll also see more dark patches on the Martian surface.

An excellent intermediate telescope is the Celestron NexStar 8SE telescope. With its 8-inch aperture, it has a fantastic light-gathering ability to deliver sharp images for intermediate to advanced stargazers.

Advanced observer: 8 inches or larger

Advanced observers want to get as many details as possible when viewing the red planet. Thus, an advanced observer needs a more powerful and larger telescope (not smaller than an 8 inches aperture). 

A powerful telescope will reveal an incredible amount of surface detail. It lets you see finer details of the three Martian surface albedo – dark regions, bright orange-red regions, and bright white polar caps.

A perfect example is the Celestron–StarSense Explorer 10-inch Dobsonian Smartphone App-Enabled Telescope.

What is the best telescope magnification to view Mars?

To see most of Mars’ surface features, you should use 30 – 50x magnification.

When viewing Mars, the higher the magnification, the better. So, for the best viewing experience, use your telescope’s maximum useful magnification.

A telescope’s maximum useful magnification is 50x its aperture size in inches or (2x the aperture in millimeters). Thus, the maximum useful magnification of this 8 inches NexStar computerized telescope is 400.

Using the optimal useful magnification (50 aperture) is not often possible. So, when viewing Mars, it’s good to try for a magnification of 30x – 50x aperture size.

To know the magnification of your telescope, divide its focal length by the eyepiece’s focal length. Magnification = telescope’s focal length ÷ eyepiece’s focal length.

What can I see on Mars with a small telescope?

Mars is distinct in the night sky. While stars will appear as shining pinpricks, Mars appears as a red disc.

Mars is the only planet whose surface features can clearly be seen from Earth. Under ideal conditions, you can see much of Mars’ surface, even with a small telescope.

Around opposition, even with a small telescope, you can see the following:

A polar cap

During Martian northern and southern winters, polar ice caps forms at the planet’s poles, consisting of a layer of frozen carbon dioxide and water ice. 

With a small telescope, you can see at least one polar cap, appearing as white coloration at the top and bottom of the red planet.

Syrtis Major 

It’s one of the two major darker regions of Mars. It was formerly thought to be a sea. So, it’s named after the Gulf of Sidra off the coast of Libya. 

Syrtis Major is a wedge-shaped dark area (near the equator) pointing towards the north pole.

Mare Acidalium 

It’s the second of the major darker regions of Mars. Mare Acidalium is named after a legendary fountain. It is located in the north of Mars and extends southwards.

Elysium Planitia 

It’s one of the red-orange regions of Mars, formerly thought to be continents. It’s a broad plain that straddles the equator of the red planet.

Chryse Planitia 

This is where the first US spacecraft to Mars landed. It’s another of the lighter Mars regions. It’s a smooth circular plain in the northern equatorial region of Mars.

Dust storms 

Mars’ thin atmosphere can cause dust storms. You can see these storms with a small telescope. However, you won’t want to see Martian dust storms because they can completely obscure the planet’s surface, depriving you of seeing all of Mars’ glory.

With a more powerful telescope, you’ll see more striking features on Mars including:

Cloud 

Mars has thin water-ice clouds which are visible with a powerful telescope.

Olympus Mons 

Olympus Mons is a large shield volcano on Mars. In fact, it’s the tallest volcano in the solar system (towering about two and a half times Mount Everest’s height above sea level).

Valles Marineris 

It’s a large canyon system, which is deeper and longer than the Grand Canyon.

Martian Moons 

Mars has two moons – Phobos and Deimos – and if you use a powerful telescope, you may be lucky enough to detect them orbiting the red planet.

Where do I find Mars in the night sky with a telescope?

Mars lies in the constellation Taurus, just north and west of Orion.

People who have not been following Mars since the 2022 opposition can use star charts and sky maps in astronomy magazines and websites to locate Mars in the night sky.

How do I get the best views of Mars with a telescope?

To get the best view of Mars when observing the planet through a telescope, you need to do the following: 

Observe Mars during its closest approach to Earth

As Mars orbits the sun, its position relative to the earth constantly changes.

Mars’ features are more visible when it is closest to the earth than when it is far away. Thus, the best time to observe Mars is during its closest approach to Earth.

Mars is closest to earth when it is in opposition (or appears opposite the sun in the sky).

Mars’ latest closest approach to earth was on December 8, 2022, when it got to 0.5492 AU distance from earth. The red planet’s closest approaches in the near future will be:

• January 16, 2025 (0.6435 AU distance)
• February 19, 2027 (0.6780 AU distance)

Use a telescope with a large aperture for the best view of Mars

The larger your telescope’s aperture, the more light it gathers and the higher its resolving power.

The higher the resolution of your telescope, the clearer, and sharper its pictures. So, if you want to see the fine details of the Martain surface, you need a telescope with a large aperture. 

The Orion 8945 SkyQuest XT8 Classic Dobsonian Telescope is a powerful telescope that is easy to use because of its Dobsonian design. Importantly, it’s the perfect large-aperture low-budget telescope.

Use high-quality eyepieces and a Barlow lens

The eyepiece is the part of the telescope that magnifies the image produced by the microphone’s objective. A high-quality eyepiece helps you achieve useful magnification so that the human eye can see the image.

Using a Barlow lens is one of the easiest ways to increase the magnification of your telescope. A Barlow lens increases the focal length of a telescope by reducing the convergence of the light cone heading toward the eyepiece.

Since a telescope’s magnification is determined by dividing the focal length by the eyepiece’s focal length, increasing the focal length increases the magnification.

You may also like The Best Barlow Lens For Any Telescope (Buying Guide)

Use filters to enhance the view of specific features on the Martian Surface

A telescope’s filter improves contrasts and enhances details by “filtering” out unwanted colors or wavelengths.

Know that light pollution is a real killer when viewing Mars. Filters help you see Martian features in greater detail by filtering out unwanted light. For example:

• Red (#23A, #25, #29) filters enhance fine surface details, allowing you to see dust clouds and polar cap boundaries clearly.
• Blue (#38A, #80A, #82A) filters enhance clouds, helping you make out discrete white clouds, equatorial cloud bands, etc.

That said, investing in filters will help you get the best views of Mars with a telescope.

Properly align and focus your telescope before observing

You will see blurry images if your telescope is not properly aligned. So, to get clear views of Mars, you need to properly align your telescope before viewing. You can easily do this using a bright star in a dark sky.

• Focus your telescope on a very bright star in the sky
• Center the star in the field of view, and zoom in on it as much as possible
• Then slowly defocus the star, ensuring a pattern of concentric circles appears around it.

Use a motorized equatorial mount for tracking Mars

As the earth turns, an astronomical object you are observing can go out of your telescope’s field of vision. A motorized equatorial mount prevents this.

The motorized equatorial mount is an advanced mount that helps you keep Mars in your telescope’s field of vision for long-exposure astrophotography.

One perfect equatorial mount for tracking Mars is this Celestron CGX Computerized German Equatorial Mount and Tripod.

Take a series of images of Mars over time to watch any changes in its surface features

Like the Earth, Mars rotates about its axis as it orbits the sun. So, the view of the planet from your observing position changes slightly from night to night.

A Mars day lasts 37 minutes longer than an Earth day. So, Mars appears to rotate slowly from east to west, revealing all its surface features.

Thus, to get the best results, you should take a series of images to see the changes in the planet’s surface features over time. 

Observe Mars in the early evening when it is higher in the sky and the air is more stable

The best time to observe Mars is when it is at its highest point in the sky. The red planet is brightest at its highest point in the sky, allowing you to explore more of its surface features.

In the few weeks after opposition, Mars appears higher in the sky in the early evenings.

However, this does not mean you’ll get the best viewing result in any evening. Nights with steady air are best for viewing Mars. 

A turbulent atmosphere will make Mars appear as a boiling reddish blob in the telescope. But in a steady atmosphere, you can see its finer details.

Join an online observing group or club

Astronomy is more fun when you do it with like-minded people. In an observing group or club, you’ll find people ready to share their knowledge of the sky.

You’ll learn new techniques and discover new equipment to help you get richer images when viewing Mars. So an observing group is one of the best resources for developing your skills in astronomy.

A popular astronomy club is the Virtual Astronomy Club. They’ll guide you through everything, from setting up your telescope to discovering galaxies and nebulae. We like their detailed monthly guides and challenges to attempt. 

The Griffith Observatory in Los Angeles is another space to follow for great Mars viewing experiences. They host special events that connect people to special sights in the sky. 

You may also like: How Big of a Telescope Do You Need to See Saturn’s Rings?

Takeaway – Explore the fascinating red world of Mars

You can see Mars with your naked eye. However, a telescope gives a better experience as it enhances the image, turning it from an uninspiring red disc to a fascinating feature-filled world.

You can see major features on Mar’s surface with a small telescope. But you need a powerful telescope to see the planet’s finer details.

A 4 – 6 inches telescope is fine for beginners/ casual observers. A 6 – 8 inches telescope is suitable for intermediate observers. While advanced observers need a telescope that’s 8 inches or larger.

Important factors to consider when choosing a telescope for exploring the fascinating red world of Mars include magnification, aperture, quality of optics, mount type, and budget.

Read also:

• 8 Reasons Why We Could Live on Mars
• 10 Best Dobsonian Telescopes (Ranked!)