";s:4:"text";s:2415:" This makes Neptune the 4th largest planet in the Solar System, after Jupiter, Saturn and Uranus. [/caption] The diameter of Neptune is approximately 49,500 km. The Diameter of Uranus is about 51,118 kilometers (equatorial diameter). The Latest Revisiting Decades-Old Voyager 2 Data, Scientists Find One More Secret. Get the latest updates on NASA missions, watch NASA TV live, and learn about our quest to reveal the unknown and benefit all humankind. Diameter comparison of Uranus and Earth. Uranus's moons are divided into three groups: thirteen inner moons, five major moons, and nine irregular moons. Uranus Observational Parameters Discoverer: William Herschel Discovery Date: 13 March 1781 Distance from Earth Minimum (10 6 km) 2581.9 Maximum (10 6 km) 3157.3 Apparent diameter from Earth Maximum (seconds of arc) 4.1 Minimum (seconds of arc) 3.3 Mean values at opposition from Earth Distance from Earth (10 6 km) 2719.99 Apparent diameter (seconds of arc) 3.9 Apparent visual … So the circumference is about 160,592 kilometers. Example: Saturn has about nine times Earth's diameter, slightly more for the equatorial, slighly less for the polar diameter. The Diameter of Uranus is about 51,118 kilometers (equatorial diameter). Uranus, the seventh planet of the Solar System, has 27 known moons, most of which are named after characters that appear in, or are mentioned in, the works of William Shakespeare and Alexander Pope. Overview The first planet found with the aid of a telescope, Uranus was discovered in 1781 by astronomer William Herschel, although he originally thought it was either a comet or a star. One unique feature of Uranus is that it rotates on its side. Approximate scale is 90 km/px. From left to right: Puck, Miranda, Ariel, Umbriel, Titania, and Oberon Uranus, the seventh planet of the Solar System, has 27 known moons, all of which are named after characters from the works of William Shakespeare and Alexander Pope. Please enter first the kind of diameter, then enter one value. Credit: NASA. Uranus: Neptune: Pluto: Sun: Round to .