how long is a day on pluto

How Long is a Day on Pluto in Earth Days / Hours / Years

Pluto, once considered the ninth planet in our solar system, has intrigued scientists and stargazers for decades. As we explore this enigmatic dwarf planet, one question that arises is the length of a day on Pluto. In this blog post, we will delve into the fascinating details of how long a day is on Pluto and the factors that influence this measurement, shedding light on the unique timekeeping of this distant world.

Defining a Day on Pluto

Before we embark on understanding the day length on Pluto, it's important to clarify what constitutes a day on a celestial body. A day is the time it takes for a planet or object to complete one full rotation on its axis, resulting in a cycle of day and night. On Earth, a day lasts 24 hours, but Pluto's day length is markedly different.

How Long is a Day on Dwarf Planet Pluto in Earth Days / Hours / Years

Pluto, classified as a dwarf planet, has a rotational period that is somewhat similar to the rotation of terrestrial planets. Here are the details for a day on Pluto:

  • Pluto Day (Rotation Period): Approximately 6.4 Earth days.

So, a day on Pluto, measured by its rotation period, is approximately 6.4 Earth days.

  • Hours: To convert this into hours, it is approximately 6.4 daysĂ—24 hours per day.
  • Years: Pluto's year, or the time it takes to complete one orbit around the Sun, is about 248 Earth years.

Keep in mind that Pluto's rotation is tidally locked with its largest moon, Charon, so both Pluto and Charon always show the same face to each other as they orbit around a common center of mass. This means that Pluto's rotation period is synchronized with its orbital period around the Sun.

The Slow Rotation of Pluto

Pluto rotates on its axis at a leisurely pace compared to Earth. It takes approximately 6.4 Earth days for Pluto to complete one full rotation. This means that a day on Pluto lasts about 153 hours and 21 minutes.

Influence of Pluto's Tilt and Orbit

Pluto's axial tilt and elliptical orbit around the Sun contribute to variations in daylight and darkness on the dwarf planet. As Pluto orbits the Sun, its axial tilt causes shifts in the distribution of sunlight across its surface, leading to changes in temperature and the length of daylight.

The Tumbling Motion of Pluto

One intriguing aspect of Pluto's rotation is its tumbling motion. Unlike the steady rotation of most celestial bodies, Pluto exhibits a wobbling and tumbling motion due to its irregular shape and complex gravitational interactions with its moon, Charon. This motion adds another layer of complexity to Pluto's timekeeping.

Day and Night on Pluto

Given Pluto's slow rotation, a single day on this distant world is significantly longer than a day on Earth. However, since Pluto is so far from the Sun, the amount of sunlight it receives is much less intense than on Earth. This results in frigid temperatures on Pluto's surface, even during its "daytime."

The New Horizons Mission

Our understanding of Pluto's day length comes from data collected by NASA's New Horizons mission, which conducted a flyby of the dwarf planet in 2015. The spacecraft captured images and gathered valuable information about Pluto's rotation, surface features, and atmosphere, contributing to our knowledge of this distant world.

Exploring the Mysteries of Pluto

As we continue to explore and study Pluto, our knowledge of its day length and other characteristics deepens. Future missions and advancements in technology will allow scientists to further investigate the mysteries of this dwarf planet, unlocking insights into its geology, atmosphere, and potential for supporting life.


The day length on Pluto, with its slow rotation of approximately 6.4 Earth days, sets it apart from our home planet. Pluto's timekeeping showcases the diversity and complexity of celestial bodies in our solar system. By unraveling the mysteries of Pluto's day length, scientists gain valuable insights into its rotational dynamics, climate patterns, and the forces shaping this distant world. Exploring the wonders of Pluto expands our understanding of planetary diversity and paves the way for future discoveries in our cosmic journey.

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