Ella Walter
Pan, a moon of Saturn, is approximately 35 kilometres across and 23 kilometres wide. It orbits within the Encke Gap in Saturn's A Ring and is responsible for keeping the gap free of ring particles. Pan is irregularly shaped and has been described as having the appearance of a walnut or ravioli. Its mass is estimated to be 4,945,605,829,220,740 kg, with a density of 0.42 g/cm^3. Pan's escape velocity is 25 km/h, and it orbits Saturn once every 0.575 days.
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What You'll Learn
Pan is 35km wide, 23km across, and orbits 134,000km from Saturn
Pan, a moon of Saturn, is approximately 35 kilometres across and 23 kilometres wide. It orbits within the Encke Gap in Saturn's A Ring, 134,000 kilometres from Saturn. It is the innermost named moon of Saturn and was discovered by Mark R. Showalter in 1990 when he analysed old Voyager 2 probe photos. It was also observed by Voyager 1, which took low-resolution images, and later by Cassini, which provided more detailed images.
Pan is a shepherd moon, responsible for keeping the Encke Gap free of ring particles. It has a distinctive walnut or ravioli shape, with an equatorial ridge. This unusual shape is likely due to Pan collecting ring material from the Encke Gap as it orbits. Its mass is estimated at 4,945,605,829,220,740 kg, with a density of 0.42 g/cm^3.
The Encke Gap is a 200-mile (325-kilometre) opening in Saturn's A ring. Pan orbits within this gap, maintaining particles in horseshoe orbits. As it orbits Saturn every 13.8 hours, it creates stripes or "wakes" in the ring material on either side. These wakes are formed by ring particles receiving a gravitational "kick" from Pan as they move faster in their orbits, causing waves to develop in the gap and throughout the ring.
The moon is named after the Greek god Pan, the god of shepherds, nature, and the wild. The name is fitting, given Pan's role as a shepherd moon.
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Pan is the innermost of Saturn's 148 moons
The moon was named after the mythological Greek god Pan, who was the god of shepherds, among other things. The name is also a reference to this role as a shepherd moon. It is sometimes described as having the appearance of a walnut, or a ravioli, due to its prominent equatorial ridge. This ridge is caused by ring material that Pan has swept up from the Encke Gap.
The existence of a moon in the Encke Gap was first predicted in 1985 by Jeffrey N. Cuzzi and Jeffrey D. Scargle, who noticed wavy edges of the gap, indicating a gravitational disturbance. In 1986, Showalter and his team inferred its orbit and mass by modelling its gravitational wake. They predicted a semi-major axis of 133,603 ± 10 km and a mass of 5–10×10^12 Saturn masses. They also inferred that there was only a single moon within the Encke gap.
Pan is one of Saturn's innermost moons, along with Daphnis, Atlas, Prometheus, Pandora, Epimetheus, Janus, and Mimas. These moons orbit within Saturn's ring system and have orbital periods only slightly longer than the planet's rotation period.
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Pan was discovered in 1990 by Mark R. Showalter
Pan, the innermost named moon of Saturn, is approximately 35 kilometres (21.7 miles) across and 23 kilometres (14.3 miles) wide. It orbits within the Encke Gap in Saturn's A Ring and is a ring shepherd, keeping the gap free of ring particles. Its distance from Saturn varies by around 4 kilometres (2.5 miles) due to the eccentricity of its orbit.
Pan was discovered by Mark R. Showalter in 1990 through analysis of old Voyager 2 probe photos. Showalter is a senior research scientist at the SETI Institute, with a particular interest in the dynamics of rings and small moons in the Solar System. He has discovered six moons and three planetary rings. Showalter's work with Voyager data also led to the discovery of Jupiter's faint, outer "gossamer" rings.
In 1980 and 1981, the twin Voyager spacecraft flew by Saturn, capturing images of its rings. One of these images, when viewed from the side, revealed a wavy edge to the Encke Gap, indicating a gravitational disturbance. In 1985, Jeffrey N. Cuzzi and Jeffrey D. Scargle published a paper predicting the existence of a moon within the Encke Gap, which they dubbed "TBD". Showalter, in collaboration with Cuzzi and Scargle, used all the Voyager 2 images to predict whether the moon would be visible under favourable conditions. They then inferred the orbit and mass of the moon by modelling its gravitational wake, arriving at a precise prediction for the semi-major axis and mass.
In June 1990, Showalter had access to all 30,000 Voyager images of Saturn on CD-ROM. Using his knowledge of when and where the images were taken, along with the predicted orbital path of the moon, he identified the most promising image and discovered Pan, appearing as a single bright pixel in the middle of the dark Encke Gap.
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Pan is irregularly shaped, often described as walnut or ravioli-shaped
Pan, the innermost of Saturn's moons, is irregularly shaped and is often described as walnut or ravioli-shaped. It has a mean radius of 8.8 miles (14.1 kilometres) and is approximately 35 kilometres across and 23 kilometres wide. It orbits within the Encke Gap in Saturn's A Ring, and is responsible for keeping the gap free of ring particles.
The moon's walnut-like shape is due to its equatorial ridge, which is caused by ring material that Pan has swept up from the Encke Gap. This ridge has also led to it being compared to a space empanada, a form of stuffed bread or pastry. The Encke Gap contains a ringlet that coincides with Pan's orbit, indicating that the moon maintains the particles in horseshoe orbits.
The unusual shape of Pan may also be due to collisions between tiny moonlets, causing them to merge and form Pan. This is known as the pyramidal regime formation scenario. Pan's mass is estimated to be 4,945,605,829,220,740 kg, with a density of 0.42 g/cm^3. Its volume is 11,742.00 (km^3), and its surface area is 2,498.32 km^2.
The moon was discovered in 1990 by Mark R. Showalter when he was analysing old images of Saturn and its rings taken by Voyager 2. It was later found within 1° of the predicted position. The moon was named after the mythological Greek god Pan, who was the god of shepherds, nature, and the wild.
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Pan's mass is 4,945,605,829,220,740kg, with a density of 0.42g/cm^3
Pan, a moon of Saturn, has a mass of 4,945,605,829,220,740 kg and a density of 0.42 g/cm^3. This moon, discovered in 1990 by Mark R. Showalter, is one of 148 moons orbiting Saturn. Pan is the innermost named moon of Saturn and is approximately 35 kilometres across and 23 km wide. It orbits within the Encke Gap in Saturn's A Ring and is responsible for keeping the gap free of ring particles.
Pan's mass and density are intriguing aspects of this moon. Its mass is almost five trillion kilograms, which is quite substantial for an object of its size. The density of 0.42 g/cm^3 indicates that Pan is a relatively lightweight object. This low density suggests that Pan may be composed of less dense materials, such as ice or other volatile substances.
The shape of Pan is quite distinctive, often described as resembling a walnut or ravioli due to its equatorial ridge. This ridge is believed to be formed from ring material that Pan has swept up from the Encke Gap. The moon's volume is 11,742.00 cubic kilometres, and its equatorial radius is 14.00 kilometres. Its surface area is 2,498.32 square kilometres, which is quite small compared to Earth's surface area.
Pan's mass and density play a crucial role in its interaction with other celestial bodies. For example, its mass affects its gravitational force, which is much weaker than that of Earth. This weaker gravity means that objects weigh significantly less on Pan than they do on Earth. Additionally, Pan's mass and density influence its orbital dynamics around Saturn. The moon's mean orbit velocity is 60,819.40 km/h, and it completes an orbit around Saturn in just 0.575 days.
In summary, Pan's mass of 4,945,605,829,220,740 kg and density of 0.42 g/cm^3 are key characteristics that contribute to its unique nature as a moon of Saturn. Its relatively low density and substantial mass influence its gravitational force and orbital behaviour, making it an intriguing object of study in our solar system.
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Frequently asked questions
Pan is approximately 35 kilometres across and 23 km wide. It has a mean radius of 8.8 miles (14.1 kilometres).
Pan is one of the smallest of Saturn's 148 moons.
Pan is much smaller than Earth. Earth's mean radius is 1,079.6 miles (1,737.5 kilometres).
The surface area of Pan is 2,498.32 square kilometres.
