Diameter of Jupiter lxi

Jupiter, the largest planet in our solar system, has been a subject of curiosity for astronomers for centuries. One of the most intriguing aspects of Jupiter is its diameter, which has been a subject of controversy for decades. In this article, we will explore the mystery surrounding Jupiter’s diameter and the scientific efforts to unravel its secrets.

What is Jupiter?

Before diving into the mystery of Jupiter’s diameter, it is important to understand what Jupiter is. Jupiter is a gas giant planet composed mostly of hydrogen and helium. It is the fifth planet from the Sun and the largest planet in our solar system. Jupiter is known for its iconic Great Red Spot, a massive storm that has been raging for centuries.

The Controversy Surrounding Jupiter’s Diameter

Jupiter’s diameter has been a topic of debate for many years. The current accepted diameter of Jupiter is 139,822 kilometers (86,881 miles), which was calculated by NASA’s Voyager missions in the 1970s. However, some scientists argue that this number is incorrect and that Jupiter’s diameter is actually smaller.

The Pioneer Anomaly

One of the most significant pieces of evidence used to argue for a smaller diameter of Jupiter is the Pioneer anomaly. The Pioneer 10 and 11 spacecraft were launched in the 1970s to explore the outer reaches of our solar system. However, scientists noticed that these spacecraft were experiencing a small, unexplained acceleration that could not be accounted for by any known forces.

Could the Pioneer Anomaly be Explained by a Smaller Jupiter?

One theory to explain the Pioneer anomaly is that Jupiter’s diameter is smaller than the currently accepted measurement. If this were true, then Jupiter’s gravity would be weaker than previously thought, which could account for the unexplained acceleration of the Pioneer spacecraft.

Other Efforts to Measure Jupiter’s Diameter

To further investigate the mystery of Jupiter’s diameter, other scientific efforts have been made to measure the planet’s size. In 1995, the Galileo spacecraft used radio waves to measure the diameter of Jupiter lxi and found it slightly smaller than the Voyager measurement.

The Juno Mission

In 2011, NASA launched the Juno mission to study Jupiter in more detail than ever before. One of Juno’s objectives was to measure Jupiter’s gravity field, which could provide more accurate information about the planet’s diameter. In 2016, the Juno spacecraft arrived at Jupiter and began its mission.

The Results of the Juno Mission

The Juno mission has provided some exciting new insights into Jupiter’s diameter. In 2018, scientists published a study based on Juno data that found Jupiter’s diameter to be slightly larger than the Voyager measurement. However, this measurement is still within the margin of error of previous measurements, so the controversy surrounding Jupiter’s diameter remains.

The Importance of Understanding Jupiter’s Diameter

While the mystery of Jupiter’s diameter may seem like a minor scientific debate, it has important implications for our understanding of our solar system. Accurate measurements of Jupiter’s diameter are essential for understanding the planet’s gravity and the dynamics of the solar system.


Jupiter’s diameter remains a topic of scientific debate and controversy. While the currently accepted measurement is 139,822 kilometers, some scientists argue that Jupiter’s diameter is actually smaller. The Juno mission has provided new insights into Jupiter’s diameter, but the mystery remains unsolved. Accurate measurements of Jupiter’s diameter are crucial for our understanding of the solar system, and scientists will continue to study this gas giant in the years to come.

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