Saturn in natural color, photographed by Cassini, 2004
Average orbital speed
|Known satellites||62 with formal designations; innumerable additional moonlets.|
(less than water)
Sidereal rotation period
(10 hr 34 min)
Equatorial rotation velocity
North pole right ascension
North pole declination
|+1.47 to −0.24|
|14.5″ to 20.1″
Saturn is the sixth planet from the Sun and the second largest planet in the Solar System, after Jupiter. Named after the Roman god of agriculture, its astronomical symbol (♄) represents the god's sickle. Saturn is a gas giant with an average radius about nine times that of Earth. While only one-eighth the average density of Earth, with its larger volume Saturn is just over 95 times more massive.
Saturn's interior is probably composed of a core of iron, nickel and rock (silicon and oxygen compounds), surrounded by a deep layer of metallic hydrogen, an intermediate layer of liquid hydrogen and liquid helium and an outer gaseous layer. The planet exhibits a pale yellow hue due to ammonia crystals in its upper atmosphere. Electrical current within the metallic hydrogen layer is thought to give rise to Saturn's planetary magnetic field, which is weaker than Earth's magnetic field but has a magnetic moment 580 times that of the Earth due to Saturn's larger body radius. Saturn's magnetic field strength is around one-twentieth the strength of Jupiter's. The outer atmosphere is generally bland and lacking in contrast, although long-lived features can appear. Wind speeds on Saturn can reach 1,800 km/h (1,100 mph), faster than on Jupiter, but not as fast as those on Neptune.
Saturn has a prominent ring system that consists of nine continuous main rings and three discontinuous arcs, composed mostly of ice particles with a smaller amount of rocky debris and dust. Sixty-two known moons orbit the planet; fifty-three are officially named. This does not include the hundreds of "moonlets" comprising the rings. Titan, Saturn's largest and the Solar System's second largest moon, is larger than the planet Mercury and is the only moon in the Solar System to retain a substantial atmosphere.
- 1 Physical characteristics
- 2 Atmosphere
- 3 Magnetosphere
- 4 Orbit and rotation
- 5 Planetary rings
- 6 Natural satellites
- 7 History of exploration
- 8 Observation
- 9 In culture
- 10 See also
- 11 Notes
- 12 References
- 13 Further reading
- 14 External links
Saturn is classified as a gas giant because the exterior is predominantly composed of gas and it lacks a definite surface, although it may have a solid core. The rotation of the planet causes it to take the shape of an oblate spheroid; that is, it is flattened at the poles and bulges at the equator. Its equatorial and polar radii differ by almost 10%: 60,268 km versus 54,364 km, respectively. Jupiter, Uranus, and Neptune, the other gas giants in the Solar System, are also oblate but to a lesser extent. Saturn is the only planet of the Solar System that is less dense than water—about 30% less. Although Saturn's core is considerably denser than water, the average specific density of the planet is 0.69 g/cm3 due to the gaseous atmosphere. Jupiter has 318 times the Earth's mass, while Saturn is 95 times the mass of the Earth, Together, Jupiter and Saturn hold 92% of the total planetary mass in the Solar System.
Saturn is termed a gas giant, but it is not entirely gaseous. The planet primarily consists of hydrogen, which becomes a non-ideal liquid when the density is above 0.01 g/cm3. This density is reached at a radius containing 99.9% of Saturn's mass. The temperature, pressure and density inside the planet all rise steadily toward the core, which, in the deeper layers of the planet, cause hydrogen to transition into a metal.
Standard planetary models suggest that the interior of Saturn is similar to that of Jupiter, having a small rocky core surrounded by hydrogen and helium with trace amounts of various volatiles. This core is similar in composition to the Earth, but more dense. Examination of the gravitational moment of the planet, in combination with physical models of the interior, allowed French astronomers Didier Saumon and Tristan Guillot to place constraints on the mass of the planet's core. In 2004, they estimated that the core must be 9–22 times the mass of the Earth, which corresponds to a diameter of about 25,000 km. This is surrounded by a thicker liquid metallic hydrogen layer, followed by a liquid layer of helium-saturated molecular hydrogen that gradually transitions into gas with increasing altitude. The outermost layer spans 1,000 km and consists of a gaseous atmosphere.
Saturn has a very hot interior, reaching 11,700 °C at the core, and the planet radiates 2.5 times more energy into space than it receives from the Sun. Most of this extra energy is generated by the Kelvin–Helmholtz mechanism of slow gravitational compression, but this alone may not be sufficient to explain Saturn's heat production. An additional mechanism may be at play whereby Saturn generates some of its heat through the "raining out" of droplets of helium deep in its interior. As the droplets descend through the lower-density hydrogen, the process releases heat by friction and leaves the outer layers of the planet depleted of helium. These descending droplets may have accumulated into a helium shell surrounding the core.
Diagram of Saturn
The outer atmosphere of Saturn contains 96.3% molecular hydrogen and 3.25% helium. The proportion of helium is significantly deficient compared to the abundance of this element in the Sun. The quantity of elements heavier than helium are not known precisely, but the proportions are assumed to match the primordial abundances from the formation of the Solar System. The total mass of these heavier elements is estimated to be 19–31 times the mass of the Earth, with a significant fraction located in Saturn's core region.
Trace amounts of ammonia, acetylene, ethane, propane, phosphine and methane have been detected in Saturn's atmosphere. The upper clouds are composed of ammonia crystals, while the lower level clouds appear to consist of either ammonium hydrosulfide (NH4SH) or water. Ultraviolet radiation from the Sun causes methane photolysis in the upper atmosphere, leading to a series of hydrocarbon chemical reactions with the resulting products being carried downward by eddies and diffusion. This photochemical cycle is modulated by Saturn's annual seasonal cycle.
Saturn's atmosphere exhibits a banded pattern similar to Jupiter's, but Saturn's bands are much fainter and are much wider near the equator. The nomenclature used to describe these bands is the same as on Jupiter. Saturn's finer cloud patterns were not observed until the flybys of the Voyager spacecraft during the 1980s. Since then, Earth-based telescopy has improved to the point where regular observations can be made.
The composition of the clouds varies with depth and increasing pressure. In the upper cloud layers, with the temperature in the range 100–160 K and pressures extending between 0.5–2 bar, the clouds consist of ammonia ice. Water ice clouds begin at a level where the pressure is about 2.5 bar and extend down to 9.5 bar, where temperatures range from 185–270 K. Intermixed in this layer is a band of ammonium hydrosulfide ice, lying in the pressure range 3–6 bar with temperatures of 290–235 K. Finally, the lower layers, where pressures are between 10–20 bar and temperatures are 270–330 K, contains a region of water droplets with ammonia in aqueous solution.
Saturn's usually bland atmosphere occasionally exhibits long-lived ovals and other features common on Jupiter. In 1990, the Hubble Space Telescope imaged an enormous white cloud near Saturn's equator that was not present during the Voyager encounters and in 1994, another, smaller storm was observed. The 1990 storm was an example of a Great White Spot, a unique but short-lived phenomenon that occurs once every Saturnian year, roughly every 30 Earth years, around the time of the northern hemisphere's summer solstice. Previous Great White Spots were observed in 1876, 1903, 1933 and 1960, with the 1933 storm being the most famous. If the periodicity is maintained, another storm will occur in about 2020.
The winds on Saturn are the second fastest among the Solar System's planets, after Neptune's. Voyager data indicate peak easterly winds of 500 m/s (1800 km/h). In images from the Cassini spacecraft during 2007, Saturn's northern hemisphere displayed a bright blue hue, similar to Uranus. The color was most likely caused by Rayleigh scattering. Infrared imaging has shown that Saturn's south pole has a warm polar vortex, the only known example of such a phenomenon in the Solar System. Whereas temperatures on Saturn are normally −185 °C, temperatures on the vortex often reach as high as −122 °C, believed to be the warmest spot on Saturn.
North pole hexagonal cloud pattern
The sides of the hexagon are each about 13,800 km (8,600 mi) long, which is longer than the diameter of the Earth. The entire structure rotates with a period of 10h 39m 24s (the same period as that of the planet's radio emissions) which is assumed to be equal to the period of rotation of Saturn's interior. The hexagonal feature does not shift in longitude like the other clouds in the visible atmosphere.
The pattern's origin is a matter of much speculation. Most astronomers believe it was caused by some standing-wave pattern in the atmosphere. Polygonal shapes have been replicated in the laboratory through differential rotation of fluids.
South pole vortex
HST imaging of the south polar region indicates the presence of a jet stream, but no strong polar vortex nor any hexagonal standing wave. NASA reported in November 2006 that Cassini had observed a "hurricane-like" storm locked to the south pole that had a clearly defined eyewall. This observation is particularly notable because eyewall clouds had not previously been seen on any planet other than Earth. For example, images from the Galileo spacecraft did not show an eyewall in the Great Red Spot of Jupiter.
Cassini has observed a series of cloud features nicknamed "String of Pearls" found in northern latitudes. These features are cloud clearings that reside in deeper cloud layers.
Saturn has an intrinsic magnetic field that has a simple, symmetric shape – a magnetic dipole. Its strength at the equator – 0.2 gauss (20 µT) – is approximately one twentieth of that of the field around Jupiter and slightly weaker than Earth's magnetic field. As a result Saturn's magnetosphere is much smaller than Jupiter's. When Voyager 2 entered the magnetosphere, the solar wind pressure was high and the magnetosphere extended only 19 Saturn radii, or 1.1 million km (712,000 mi), although it enlarged within several hours, and remained so for about three days. Most probably, the magnetic field is generated similarly to that of Jupiter – by currents in the liquid metallic-hydrogen layer called a metallic-hydrogen dynamo. This magnetosphere is efficient at deflecting the solar wind particles from the Sun. The moon Titan orbits within the outer part of Saturn's magnetosphere and contributes plasma from the ionized particles in Titan's outer atmosphere. Saturn's magnetosphere, like Earth's, produces aurorae.
Orbit and rotation
The average distance between Saturn and the Sun is over 1.4 billion kilometres (9 AU). With an average orbital speed of 9.69 km/s, it takes Saturn 10,759 Earth days (or about 29½ years), to finish one revolution around the Sun. The elliptical orbit of Saturn is inclined 2.48° relative to the orbital plane of the Earth. Because of an eccentricity of 0.056, the distance between Saturn and the Sun varies by approximately 155 million kilometres between perihelion and aphelion, which are the nearest and most distant points of the planet along its orbital path, respectively.
The visible features on Saturn rotate at different rates depending on latitude and multiple rotation periods have been assigned to various regions (as in Jupiter's case): System I has a period of 10 h 14 min 00 s (844.3°/d) and encompasses the Equatorial Zone, which extends from the northern edge of the South Equatorial Belt to the southern edge of the North Equatorial Belt. All other Saturnian latitudes have been assigned a rotation period of 10 h 38 min 25.4 s (810.76°/d), which is System II. System III, based on radio emissions from the planet in the period of the Voyager flybys, has a period of 10 h 39 min 22.4 s (810.8°/d); because it is very close to System II, it has largely superseded it.
A precise value for the rotation period of the interior remains elusive. While approaching Saturn in 2004, Cassini found that the radio rotation period of Saturn had increased appreciably, to approximately 10 h 45 m 45 s (± 36 s). In March 2007, it was found that the variation of radio emissions from the planet did not match Saturn's rotation rate. This variance may be caused by geyser activity on Saturn's moon Enceladus. The water vapor emitted into Saturn's orbit by this activity becomes charged and creates a drag upon Saturn's magnetic field, slowing its rotation slightly relative to the rotation of the planet. The latest estimate of Saturn's rotation based on a compilation of various measurements from the Cassini, Voyager and Pioneer probes was reported in September 2007 is 10 hours, 32 minutes, 35 seconds.
Saturn is probably best known for the system of planetary rings that makes it visually unique. The rings extend from 6,630 km to 120,700 km above Saturn's equator, average approximately 20 meters in thickness and are composed of 93% water ice with traces of tholin impurities and 7% amorphous carbon. The particles that make up the rings range in size from specks of dust up to 10 m. While the other gas giants also have ring systems, Saturn's is the largest and most visible. There are two main hypotheses regarding the origin of the rings. One hypothesis is that the rings are remnants of a destroyed moon of Saturn. The second hypothesis is that the rings are left over from the original nebular material from which Saturn formed. Some ice in the central rings comes from the moon Enceladus's ice volcanoes. In the past, astronomers believed the rings formed alongside the planet when it formed billions of years ago. Instead, the age of these planetary rings is probably some hundreds of millions of years.
Beyond the main rings at a distance of 12 million km from the planet is the sparse Phoebe ring, which is tilted at an angle of 27° to the other rings and, like Phoebe, orbits in retrograde fashion. Some of the moons of Saturn, including Pandora and Prometheus, act as shepherd moons to confine the rings and prevent them from spreading out. Pan and Atlas cause weak, linear density waves in Saturn's rings that have yielded more reliable calculations of their masses.
Saturn has at least 150 moons and moonlets, 53 of which have formal names. Titan, the largest, comprises more than 90% of the mass in orbit around Saturn, including the rings. Saturn's second largest moon, Rhea, may have a tenuous ring system of its own, along with a tenuous atmosphere.
Many of the other moons are very small: 34 are less than 10 km in diameter and another 14 less than 50 km but larger than 10 km. Traditionally, most of Saturn's moons have been named after Titans of Greek mythology. Titan is the only satellite in the Solar System with a major atmosphere in which a complex organic chemistry occurs. It is the only satellite with hydrocarbon lakes.
On June 6, 2013, scientists at the IAA-CSIC reported the detection of polycyclic aromatic hydrocarbons in the upper atmosphere of Titan, a possible precursor for life. On June 23, 2014, NASA claimed to have strong evidence that nitrogen in the atmosphere of Titan came from materials in the Oort cloud, associated with comets, and not from the materials that formed Saturn in earlier times.
Saturn's moon Enceladus has often been regarded as a potential base for microbial life. Evidence of this life includes the satellite's salt-rich particles having an "ocean-like" composition that indicates most of Enceladus's expelled ice comes from the evaporation of liquid salt water.
History of exploration
There have been three main phases in the observation and exploration of Saturn. The first era was ancient observations (such as with the naked eye), before the invention of the modern telescopes. Starting in the 17th century progressively more advanced telescopic observations from earth have been made. The other type is visitation by spacecraft, either by orbiting or flyby. In the 21st century observations continue from the earth (or earth-orbiting observatories) and from the Cassini orbiter at Saturn.
Saturn has been known since prehistoric times. In ancient times, it was the most distant of the five known planets in the solar system (excluding Earth) and thus a major character in various mythologies. Babylonian astronomers systematically observed and recorded the movements of Saturn. In ancient Roman mythology, the god Saturnus, from which the planet takes its name, was the god of agriculture. The Romans considered Saturnus the equivalent of the Greek god Cronus. The Greeks had made the outermost planet sacred to Cronus, and the Romans followed suit. (In modern Greek, the planet retains its ancient name Cronus—Κρόνος: Kronos.)
The Greek scientist Ptolemy based his calculations of Saturn's orbit on observations he made while the planet was in opposition. In Hindu astrology, there are nine astrological objects, known as Navagrahas. Saturn, one of them, is known as "Shani", judges everyone based on the good and bad deeds performed in life. Ancient Chinese and Japanese culture designated the planet Saturn as the "earth star" (土星). This was based on Five Elements which were traditionally used to classify natural elements.
In ancient Hebrew, Saturn is called 'Shabbathai'. Its angel is Cassiel. Its intelligence or beneficial spirit is Agiel (layga) and its spirit (darker aspect) is Zazel (lzaz). In Ottoman Turkish, Urdu and Malay, its name is 'Zuhal', derived from Arabic زحل.
European observations (17th–19th centuries)
Saturn's rings require at least a 15-mm-diameter telescope to resolve and thus were not known to exist until Galileo first saw them in 1610. He thought of them as two moons on Saturn's sides. It was not until Christiaan Huygens used greater telescopic magnification that this notion was refuted. Huygens discovered Saturn's moon Titan; Giovanni Domenico Cassini later discovered four other moons: Iapetus, Rhea, Tethys and Dione. In 1675, Cassini discovered the gap now known as the Cassini Division.
No further discoveries of significance were made until 1789 when William Herschel discovered two further moons, Mimas and Enceladus. The irregularly shaped satellite Hyperion, which has a resonance with Titan, was discovered in 1848 by a British team.
In 1899 William Henry Pickering discovered Phoebe, a highly irregular satellite that does not rotate synchronously with Saturn as the larger moons do. Phoebe was the first such satellite found and it takes more than a year to orbit Saturn in a retrograde orbit. During the early 20th century, research on Titan led to the confirmation in 1944 that it had a thick atmosphere – a feature unique among the solar system's moons.
Modern NASA and ESA probes
Pioneer 11 flyby
Pioneer 11 carried out the first flyby of Saturn in September 1979, when it passed within 20,000 km of the planet's cloud tops. Images were taken of the planet and a few of its moons, although their resolution was too low to discern surface detail. The spacecraft also studied Saturn's rings, revealing the thin F-ring and the fact that dark gaps in the rings are bright when viewed at high phase angle (towards the sun), meaning that they contain fine light-scattering material. In addition, Pioneer 11 measured the temperature of Titan.
In November 1980, the Voyager 1 probe visited the Saturn system. It sent back the first high-resolution images of the planet, its rings and satellites. Surface features of various moons were seen for the first time. Voyager 1 performed a close flyby of Titan, increasing knowledge of the atmosphere of the moon. It proved that Titan's atmosphere is impenetrable in visible wavelengths, therefore no surface details were seen. The flyby changed the spacecraft's trajectory out from the plane of the solar system.
Almost a year later, in August 1981, Voyager 2 continued the study of the Saturn system. More close-up images of Saturn's moons were acquired, as well as evidence of changes in the atmosphere and the rings. Unfortunately, during the flyby, the probe's turnable camera platform stuck for a couple of days and some planned imaging was lost. Saturn's gravity was used to direct the spacecraft's trajectory towards Uranus.
The probes discovered and confirmed several new satellites orbiting near or within the planet's rings, as well as the small Maxwell Gap (a gap within the C Ring) and Keeler gap (a 42 km wide gap in the A Ring).
On July 1, 2004, the Cassini–Huygens space probe performed the SOI (Saturn Orbit Insertion) maneuver and entered into orbit around Saturn. Before the SOI, Cassini had already studied the system extensively. In June 2004, it had conducted a close flyby of Phoebe, sending back high-resolution images and data.
Cassini's flyby of Saturn's largest moon, Titan, has captured radar images of large lakes and their coastlines with numerous islands and mountains. The orbiter completed two Titan flybys before releasing the Huygens probe on December 25, 2004. Huygens descended onto the surface of Titan on January 14, 2005, sending a flood of data during the atmospheric descent and after the landing. Cassini has since conducted multiple flybys of Titan and other icy satellites.
Since early 2005, scientists have been tracking lightning on Saturn. The power of the lightning is approximately 1,000 times that of lightning on Earth.
In 2006, NASA reported that Cassini had found evidence of liquid water reservoirs that erupt in geysers on Saturn's moon Enceladus. Images had shown jets of icy particles being emitted into orbit around Saturn from vents in the moon's south polar region. According to Andrew Ingersoll, California Institute of Technology, "Other moons in the solar system have liquid-water oceans covered by kilometers of icy crust. What's different here is that pockets of liquid water may be no more than tens of meters below the surface." In May 2011, NASA scientists at an Enceladus Focus Group Conference reported that Enceladus "is emerging as the most habitable spot beyond Earth in the Solar System for life as we know it".
Cassini photographs have led to other significant discoveries. They have revealed a previously undiscovered planetary ring, outside the brighter main rings of Saturn and inside the G and E rings. The source of this ring is believed to be the crashing of a meteoroid off two of the moons of Saturn. In July 2006, Cassini images provided evidence of hydrocarbon lakes near Titan's north pole, the presence of which were confirmed in January 2007. In March 2007, additional images near Titan's north pole revealed hydrocarbon "seas", the largest of which is almost the size of the Caspian Sea. In October 2006, the probe detected an 8,000 km diameter cyclone-like storm with an eyewall at Saturn's south pole.
From 2004 to November 2, 2009, the probe discovered and confirmed 8 new satellites. Its primary mission ended in 2008 when the spacecraft had completed 74 orbits around the planet. The probe's mission was extended to September 2010 and then extended again to 2017, to study a full period of Saturn's seasons.
In April 2013 Cassini sent back images of a hurricane at the planet's north pole 20 times larger than those found on Earth, with winds faster than 530 km/h.
On July 19, 2013, Cassini was pointed towards Earth to capture an image of the Earth and the Moon (and, as well, Venus and Mars) as part of a natural light, multi-image portrait of the entire Saturn system. The event was unique as it was the first time NASA informed the people of Earth that a long-distance photo was being taken in advance.
Saturn is the most distant of the five planets easily visible to the naked eye, the other four being Mercury, Venus, Mars and Jupiter. (Uranus and occasionally 4 Vesta are visible to the naked eye in very dark skies.) Saturn appears to the naked eye in the night sky as a bright, yellowish point of light with an apparent magnitude of usually between +1 and 0. It takes approximately 29.5 years for the planet to complete an entire circuit of the ecliptic against the background constellations of the zodiac. Most people will require an optical aid (very large binoculars or a small telescope) that magnifies at least 30 times to achieve an image of Saturn's rings, in which clear resolution is present. Twice every Saturnian year (roughly every 15 Earth years), the rings briefly disappear from view, due to the way in which they are angled and because they are so thin. Such a "disappearance" will next occur in 2025, but Saturn will be too close to the sun for any ring-crossing observation to be possible.
Saturn and its rings are best seen when the planet is at, or near, opposition, the configuration of a planet when it is at an elongation of 180°, and thus appears opposite the Sun in the sky. A Saturnian opposition occurs every year—approximately every 378 days—and results in the planet appearing at its brightest. However, both the Earth and Saturn orbit the sun on eccentric orbits, which means their distances from the sun vary over time, and therefore so do their distances from each other, hence varying the brightness of Saturn from one opposition to the other. Also, Saturn appears brighter when the rings are angled such that they are more visible. For example, during the opposition of December 17, 2002, Saturn appeared at its brightest due to a favorable orientation of its rings relative to the Earth, even though Saturn was closer to the Earth and Sun in late 2003.
Also, from time to time Saturn is occulted by the moon (that is, the Moon covers up Saturn in the sky). As with all of the planets in our solar system, occultations of Saturn occur in “seasons”. Saturnian occultations will take place 12 or more times over a 12-month period, followed by about a five-year period in which no such activity is registered. Australian astronomy experts Hill and Horner explain the seasonal nature of Saturnian occultations:
This is the result of the fact that the moon’s orbit around the Earth is tilted to the orbit of the Earth around the sun – and so most of the time, the moon will pass above or below Saturn in the sky, and no occultation will occur. It is only when Saturn lies near the point that the moon’s orbit crosses the “plane of the ecliptic” that occultations can happen – and then they occur every time the moon swings by, until Saturn moves away from the crossing point.
- Saturn in astrology () is the ruling planet of Capricorn and, traditionally, Aquarius.
- Saturn, the Bringer of Old Age is a movement in Gustav Holst's The Planets.
- The Saturn family of rockets were developed by a team of mostly German rocket scientists led by Wernher von Braun to launch heavy payloads to Earth orbit and beyond. Originally proposed as a military satellite launcher, they were adopted as the launch vehicles for the Apollo program.
- The day Saturday is named after the planet Saturn, which is derived from the Roman god of agriculture, Saturn (linked to the Greek god Cronus).
- In Saturn's Rings is an upcoming movie from director Stephen van Vuuren about Saturn. It features more than a million photographs of the planet assembled with various techniques. The film is expected to be released in early 2014.
- Orbital elements refer to the barycenter of the Saturn system and are the instantaneous osculating values at the precise J2000 epoch. Barycenter quantities are given because, in contrast to the planetary centre, they do not experience appreciable changes on a day-to-day basis from the motion of the moons.
- Refers to the level of 1 bar atmospheric pressure
- Walter, Elizabeth (April 21, 2003). Cambridge Advanced Learner's Dictionary (Second ed.). Cambridge University Press. ISBN 978-0-521-53106-1.
- Seligman, Courtney. "Rotation Period and Day Length". Archived from the original on 2011-08-10. Retrieved 2009-08-13.
- Williams, David R. (September 7, 2006). "Saturn Fact Sheet". NASA. Archived from the original on 2011-08-21. Retrieved 2007-07-31.
- "The MeanPlane (Invariable plane) of the Solar System passing through the barycenter". 2009-04-03. Archived from the original on 2009-05-14. Retrieved 2009-04-10. (produced with Solex 10 written by Aldo Vitagliano; see also Invariable plane)
- Yeomans, Donald K. (2006-07-13). "HORIZONS Web-Interface for Saturn Barycenter (Major Body=6)". JPL Horizons On-Line Ephemeris System. Retrieved 2007-08-08. – Select "Ephemeris Type: Orbital Elements", "Time Span: 2000-01-01 12:00 to 2000-01-02". ("Target Body: Saturn Barycenter" and "Center: Sun" should be defaulted to.)
- Seidelmann, P. Kenneth; Archinal, B. A.; A'hearn, M. F. et al. (2007). "Report of the IAU/IAG Working Group on cartographic coordinates and rotational elements: 2006". Celestial Mechanics and Dynamical Astronomy 98 (3): 155–180. Bibcode:2007CeMDA..98..155S. doi:10.1007/s10569-007-9072-y.
- "NASA: Solar System Exploration: Planets: Saturn: Facts & Figures". Solarsystem.nasa.gov. 2011-03-22. Archived from the original on 2011-10-05. Retrieved 2011-08-08.
- 'Astronews' (New Spin For Saturn). Astronomy. November 2009. p. 23.
- Schmude, Richard W. Junior (2001). "Wideband photoelectric magnitude measurements of Saturn in 2000". Georgia Journal of Science. Archived from the original on 2007-10-16. Retrieved 2007-10-14.
- Brainerd, Jerome James (November 24, 2004). "Characteristics of Saturn". The Astrophysics Spectator. Archived from the original on 2011-10-05. Retrieved 2010-07-05.
- "General Information About Saturn". Scienceray. July 28, 2011. Archived from the original on 2011-10-05. Retrieved 2011-08-17.
- Brainerd, Jerome James (October 6, 2004). "Solar System Planets Compared to Earth". The Astrophysics Spectator. Archived from the original on 2011-10-05. Retrieved 2010-07-05.
- Dunbar, Brian (November 29, 2007). "NASA – Saturn". NASA. Archived from the original on 2011-10-05. Retrieved 2011-07-21.
- Cain, Fraser (July 3, 2008). "Mass of Saturn". Universe Today. Retrieved 2011-08-17.
- Brainerd, Jerome James (October 27, 2004). "Giant Gaseous Planets". The Astrophysics Spectator. Archived from the original on 2011-10-05. Retrieved 2010-07-05.
- Russell, C. T.; Luhmann, J. G. (1997). "Saturn: Magnetic Field and Magnetosphere". UCLA – IGPP Space Physics Center. Archived from the original on 2011-10-05. Retrieved 2007-04-29.
- "The Planets ('Giants')". Science Channel. June 8, 2004.
- Piazza, Enrico. "Saturn's Moons". Cassini, Equinox Mission. JPL NASA. Archived from the original on 2011-10-05. Retrieved 2010-06-22.
- Munsell, Kirk (April 6, 2005). "The Story of Saturn". NASA Jet Propulsion Laboratory; California Institute of Technology. Archived from the original on 2011-08-22. Retrieved 2007-07-07.
- Melosh, H. Jay (2011). Planetary Surface Processes. Cambridge Planetary Science 13. Cambridge University Press. p. 5. ISBN 0-521-51418-5.
- "Saturn – The Most Beautiful Planet of our solar system". Preserve Articles. January 23, 2011. Archived from the original on 2011-10-05. Retrieved 2011-07-24
- Williams, David R. (November 16, 2004). "Jupiter Fact Sheet". NASA. Archived from the original on 2011-10-05. Retrieved 2007-08-02
- Fortney, Jonathan J.; Nettelmann, Nadine (May 2010). "The Interior Structure, Composition, and Evolution of Giant Planets". Space Science Reviews 152 (1–4): 423–447. arXiv:0912.0533. Bibcode:2010SSRv..152..423F. doi:10.1007/s11214-009-9582-x
- Guillot, Tristan et al. (2009). "Saturn's Exploration Beyond Cassini-Huygens". In Dougherty, Michele K.; Esposito, Larry W.; Krimigis, Stamatios M.,. Saturn from Cassini-Huygens. Springer Science+Business Media B.V. p. 745. arXiv:0912.2020. Bibcode:2009sfch.book..745G. doi:10.1007/978-1-4020-9217-6_23. ISBN 978-1-4020-9216-9.
- Fortney, Jonathan J. (2004). "Looking into the Giant Planets". Science 305 (5689): 1414–1415. doi:10.1126/science.1101352. PMID 15353790.
- Saumon, D.; Guillot, T. (July 2004). "Shock Compression of Deuterium and the Interiors of Jupiter and Saturn". The Astrophysical Journal 609 (2): 1170–1180. arXiv:astro-ph/0403393. Bibcode:2004ApJ...609.1170S. doi:10.1086/421257.
- "Saturn". BBC. 2000. Archived from the original on 2011-08-21. Retrieved 2011-07-19.
- Faure, Gunter; Mensing, Teresa M. (2007). Introduction to planetary science: the geological perspective. Springer. p. 337. ISBN 1-4020-5233-2.
- "Saturn". National Maritime Museum. Archived from the original on 2011-10-05. Retrieved 2007-07-06.
- "Structure of Saturn's Interior". Windows to the Universe. Archived from the original on 2011-08-21. Retrieved 2011-07-19.
- de Pater, Imke; Lissauer, Jack J. (2010). Planetary Sciences (2nd ed.). Cambridge University Press. pp. 254–255. ISBN 0-521-85371-0.
- "NASA – Saturn". NASA. 2004. Archived from the original on 2011-08-21. Retrieved 2007-07-27.
- "Hubble sees a flickering light display on Saturn". ESA/Hubble Picture of the Week. Retrieved 20 May 2014.
- Saturn. Universe Guide. Retrieved 29 March 2009.
- Guillot, Tristan (1999). "Interiors of Giant Planets Inside and Outside the Solar System". Science 286 (5437): 72–77. Bibcode:1999Sci...286...72G. doi:10.1126/science.286.5437.72. PMID 10506563.
- Courtin, R. et al. (1967). "The Composition of Saturn's Atmosphere at Temperate Northern Latitudes from Voyager IRIS spectra". Bulletin of the American Astronomical Society 15: 831. Bibcode:1983BAAS...15..831C.
- Cain, Fraser (January 22, 2009). "Atmosphere of Saturn". Universe Today. Archived from the original on 2011-10-05. Retrieved 2011-07-20.
- Guerlet, S.; Fouchet, T.; Bézard, B. (November 2008). Ethane, acetylene and propane distribution in Saturn's stratosphere from Cassini/CIRS limb observations. In Combes, C. "SF2A-2008: Proceedings of the Annual meeting of the French Society of Astronomy and Astrophysics". "SF2A-2008: Proceedings of the Annual meeting of the French Society of Astronomy and Astrophysics Eds.: C. Charbonnel: 405. Bibcode:2008sf2a.conf..405G
- Martinez, Carolina (September 5, 2005). "Cassini Discovers Saturn's Dynamic Clouds Run Deep". NASA. Archived from the original on 2011-10-05. Retrieved 2007-04-29.
- Orton, Glenn S. (September 2009). "Ground-Based Observational Support for Spacecraft Exploration of the Outer Planets". Earth, Moon, and Planets 105 (2–4): 143–152. Bibcode:2009EM&P..105..143O. doi:10.1007/s11038-009-9295-x.
- Dougherty, Krimigis; Esposito, Esposito; Krimigis, Stamatios M. (2009). "Saturn from Cassini-Huygens". In Dougherty, Stamatios M.; Esposito, Larry W; Krimigis, Stamatios M. Saturn from Cassini-Huygens. Edited by M.K. Dougherty (Springer): 162. Bibcode:2009sfch.book.....D. doi:10.1007/978-1-4020-9217-6. ISBN 1-4020-9216-4
- Pérez-Hoyos, S.; Sánchez-Laveg, A.; French, R. G.; J. F., Rojas (2005). "Saturn's cloud structure and temporal evolution from ten years of Hubble Space Telescope images (1994–2003)". Icarus 176 (1): 155–174. Bibcode:2005Icar..176..155P. doi:10.1016/j.icarus.2005.01.014.
- Patrick Moore, ed., 1993 Yearbook of Astronomy, (London: W.W. Norton & Company, 1992), Mark Kidger, "The 1990 Great White Spot of Saturn", pp. 176–215.
- Hamilton, Calvin J. (1997). "Voyager Saturn Science Summary". Solarviews. Archived from the original on 2011-10-05. Retrieved 2007-07-05.
- Watanabe, Susan (March 27, 2007). "Saturn's Strange Hexagon". NASA. Archived from the original on 2010-02-01. Retrieved 2007-07-06.
- "Warm Polar Vortex on Saturn". Merrillville Community Planetarium. 2007. Archived from the original on 2011-10-05. Retrieved 2007-07-25.
- Godfrey, D. A. (1988). "A hexagonal feature around Saturn's North Pole". Icarus 76 (2): 335. Bibcode:1988Icar...76..335G. doi:10.1016/0019-1035(88)90075-9.
- Sanchez-Lavega, A.; Lecacheux, J.; Colas, F.; Laques, P. (1993). "Ground-based observations of Saturn's north polar SPOT and hexagon". Science 260 (5106): 329–32. Bibcode:1993Sci...260..329S. doi:10.1126/science.260.5106.329. PMID 17838249.
- "New images show Saturn's weird hexagon cloud". MSNBC. December 12, 2009. Archived from the original on 2011-10-05. Retrieved 2011-09-29.
- Godfrey, D. A. (March 9, 1990). "The Rotation Period of Saturn's Polar Hexagon". Science 247 (4947): 1206–1208. Bibcode:1990Sci...247.1206G. doi:10.1126/science.247.4947.1206. PMID 17809277.
- Baines, Kevin H. et al. (December 2009). "Saturn's north polar cyclone and hexagon at depth revealed by Cassini/VIMS". Planetary and Space Science 57 (14–15): 1671–1681. Bibcode:2009P&SS...57.1671B. doi:10.1016/j.pss.2009.06.026.
- Ball, Philip (May 19, 2006). "Geometric whirlpools revealed". Nature. doi:10.1038/news060515-17. Bizarre geometric shapes that appear at the centre of swirling vortices in planetary atmospheres might be explained by a simple experiment with a bucket of water but correlating this to Saturn's pattern is by no means certain.
- Aguiar, Ana C. Barbosa; Read, Peter L.; Wordsworth, Robin D; Salter, Tara; Hiro Yamazaki, Y. (April 2010). "A laboratory model of Saturn's North Polar Hexagon". Icarus 206 (2): 755–763. Bibcode:2010Icar..206..755B. doi:10.1016/j.icarus.2009.10.022. Retrieved 20 February 2013. Laboratory experiment of spinning disks in a liquid solution forms vortices around a stable hexagonal pattern similar to that of Saturn's.
- "Hubble Space Telescope Observations of the Atmospheric Dynamics in Saturn's South Pole from 1997 to 2002". The Smithsonian/NASA Astrophysics Data System. October 8, 2002. Retrieved 2007-07-06.[dead link]
- "NASA catalog page for image PIA09187". NASA Planetary Photojournal. Archived from the original on 2011-10-05. Retrieved 2007-05-23.
- "Huge 'hurricane' rages on Saturn". BBC News. November 10, 2006. Archived from the original on 2011-10-05. Retrieved 2011-09-29.
- "NASA Sees into the Eye of a Monster Storm on Saturn". NASA. November 9, 2006. Archived from the original on 2011-10-05. Retrieved 2006-11-20.
- "A Hurricane Over the South Pole of Saturn". NASA. NASA. November 13, 2006. Retrieved 2013-05-01.
- "Cassini Image Shows Saturn Draped in a String of Pearls" (Press release). Carolina Martinez , NASA. 10 November 2006. Retrieved 3 March 2013.
- McDermott, Matthew (2000). "Saturn: Atmosphere and Magnetosphere". Thinkquest Internet Challenge. Archived from the original on 2011-10-05. Retrieved 2007-07-15.
- "Voyager – Saturn's Magnetosphere". NASA Jet Propulsion Laboratory. October 18, 2010. Archived from the original on 2011-10-05. Retrieved 2011-07-19.
- Atkinson, Nancy (December 14, 2010). "Hot Plasma Explosions Inflate Saturn's Magnetic Field". Universe Today. Archived from the original on 2011-10-05. Retrieved 2011-08-24.
- Russell, Randy (June 3, 2003). "Saturn Magnetosphere Overview". Windows to the Universe. Archived from the original on 2011-10-05. Retrieved 2011-07-19.
- Cain, Fraser (January 26, 2009). "Orbit of Saturn". Universe Today. Archived from the original on 2011-10-05. Retrieved 2011-07-19.
- Benton, Julius (2006). Saturn and how to observe it. Astronomers' observing guides (11th ed.). Springer Science & Business. p. 136. ISBN 1-85233-887-3.
- "Scientists Find That Saturn's Rotation Period is a Puzzle". NASA. June 28, 2004. Archived from the original on 2011-08-21. Retrieved 2007-03-22.
- Cain, Fraser. "Saturn." Universe Today. 30 June 2008. Retrieved 17 August 2011. Archived 5 October 2011 at WebCite
- "Enceladus Geysers Mask the Length of Saturn's Day" (Press release). NASA Jet Propulsion Laboratory. March 22, 2007. Retrieved 2007-03-22. Archived 5 October 2011 at WebCite
- Gurnett, D. A. et al. (2007). "The Variable Rotation Period of the Inner Region of Saturn's Plasma Disc". Science 316 (5823): 442–5. Bibcode:2007Sci...316..442G. doi:10.1126/science.1138562. PMID 17379775.
- Anderson, J. D.; Schubert, G. (2007). "Saturn's gravitational field, internal rotation and interior structure". Science 317 (5843): 1384–1387. Bibcode:2007Sci...317.1384A. doi:10.1126/science.1144835. PMID 17823351.
- Poulet F.; Cuzzi J.N. (2002). "The Composition of Saturn's Rings". Icarus 160 (2): 350. Bibcode:2002Icar..160..350P. doi:10.1006/icar.2002.6967.
- Shafiq, Muhammad (2005). "Dusty Plasma Response to a Moving Test Change" (PDF). Retrieved 2007-07-25.
- Spahn, F. et al. (2006). "Cassini Dust Measurements at Enceladus and Implications for the Origin of the E Ring". Science 311 (5766): 1416–1418. Bibcode:2006Sci...311.1416S. doi:10.1126/science.1121375. PMID 16527969.
- "The Real Lord of the Rings". Science@NASA. February 12, 2002. Archived from the original on 2011-10-05. Retrieved August 24, 2011.
- "Age and Fate of Saturn's Rings" (PD). Creation Concepts. Retrieved 2011-07-23.
- Cowen, Rob (November 7, 2999). "Largest known planetary ring discovered". Science News. Archived from the original on 2011-10-05. Retrieved 2010-04-09.
- Russell, Randy (June 7, 2004). "Saturn Moons and Rings". Windows to the Universe. Archived from the original on 2011-10-05. Retrieved 2011-07-19.
- NASA Jet Propulsion Laboratory (March 3, 2005). "NASA's Cassini Spacecraft Continues Making New Discoveries". ScienceDaily. Archived from the original on 2011-10-05. Retrieved July 19, 2011.
- Tiscareno, Matthew (July 17, 2013). "The population of propellers in Saturn's A Ring". Cornell University Library. Retrieved 2013-07-17.
- Wall, Mike (June 21, 2011). "Saturn's 'Ice Queen' Moon Helene Shimmers in New Photo". Space.com. Archived from the original on 2011-10-05. Retrieved 2011-07-19.
- Brunier, Serge (2005). Solar System Voyage. Cambridge University Press. p. 164. ISBN 978-0-521-80724-1.
- Jones, G. H. et al. (March 7, 2008). "The Dust Halo of Saturn's Largest Icy Moon, Rhea". Science 319 (5868): 1380–1384. Bibcode:2008Sci...319.1380J. doi:10.1126/science.1151524. PMID 18323452.
- Atkinson, Nancy (November 26, 2010). "Tenuous Oxygen Atmosphere Found Around Saturn's Moon Rhea". Universe Today. Archived from the original on 2011-10-05. Retrieved 2011-07-20.
- NASA (November 30, 2010). "Thin air: Oxygen atmosphere found on Saturn's moon Rhea". ScienceDaily. Archived from the original on 2011-10-05. Retrieved 2011-07-23.
- "Oxygen found on Saturn moon: NASA spacecraft discovers Rhea has thin atmosphere rich in O2". Daily Mail. November 26, 2010. Archived from the original on 2011-10-05. Retrieved 2011-07-23.
- Ryan, Clare (November 26, 2010). "Cassini reveals oxygen atmosphere of Saturn′s moon Rhea". UCL Mullard Space Science Laboratory. Archived from the original on 2011-10-05. Retrieved 2011-07-23.
- "Saturn's Known Satellites". Department of Terrestrial Magnetism. Archived from the original on 2011-10-05. Retrieved 2010-06-22.
- "Cassini Finds Hydrocarbon Rains May Fill Titan Lakes". ScienceDaily. January 30, 2009. Archived from the original on 2011-10-05. Retrieved 2011-07-19.
- "Voyager – Titan". NASA Jet Propulsion Laboratory. October 18, 2010. Archived from the original on 2011-10-05. Retrieved 2011-07-19.
- "Evidence of hydrocarbon lakes on Titan". MSNBC. Associated Press. July 25, 2006. Archived from the original on 2011-10-05. Retrieved July 19, 2011.
- "Hydrocarbon lake finally confirmed on Titan". Cosmos Magazine. July 31, 2008. Archived from the original on 2011-10-05. Retrieved 2011-07-19.
- López-Puertas, Manuel (June 6, 2013). "PAH's in Titan's Upper Atmosphere". CSIC. Retrieved June 6, 2013.
- Dyches, Preston; Clavin, Clavin (June 23, 2014). "Titan's Building Blocks Might Pre-date Saturn". NASA. Retrieved June 24, 2014.
- NASA (April 21, 2008). "Could There Be Life On Saturn's Moon Enceladus?". ScienceDaily. Archived from the original on 2011-10-05. Retrieved 2011-07-19.
- Madrigal, Alexis (June 24, 2009). "Hunt for Life on Saturnian Moon Heats Up". Wired Science. Archived from the original on 2011-10-05. Retrieved July 19, 2011.
- Spotts, Peter N. (September 28, 2005). "Life beyond Earth? Potential solar system sites pop up". USA Today. Archived from the original on 2011-10-05. Retrieved July 21, 2011.
- Pili, Unofre (September 9, 2009). "Enceladus: Saturn′s Moon, Has Liquid Ocean of Water". Scienceray. Archived from the original on 2011-10-05. Retrieved 2011-07-21.
- "Strongest evidence yet indicates Enceladus hiding saltwater ocean". Physorg. June 22, 2011. Archived from the original on 2011-10-05. Retrieved 2011-07-19.
- Kaufman, Marc (June 22, 2011). "Saturn′s moon Enceladus shows evidence of an ocean beneath its surface". Washington Post. Archived from the original on 2011-10-05. Retrieved 2011-07-19.
- Greicius, Tony; Dunbar, Brian (June 22, 2011). "Cassini Captures Ocean-Like Spray at Saturn Moon". NASA. Archived from the original on 2011-10-05. Retrieved 2011-09-17.
- Platt, Jane; Brown, Dwayne (14 April 2014). "NASA Cassini Images May Reveal Birth of a Saturn Moon". NASA. Retrieved 14 April 2014.
- "Saturn > Observing Saturn". National Maritime Museum. Archived from the original on 2007-04-22. Retrieved 2007-07-06.
- Sachs, A. (May 2, 1974). "Babylonian Observational Astronomy". Philosophical Transactions of the Royal Society of London (Royal Society of London) 276 (1257): 43–50 [45 & 48–9]. Bibcode:1974RSPTA.276...43S. doi:10.1098/rsta.1974.0008. JSTOR 74273.
- "Starry Night Times". Imaginova Corp. 2006. Archived from the original on 2011-08-21. Retrieved 2007-07-05.
- Evans, James (1998). The History and Practice of Ancient Astronomy. Oxford University Press. pp. 296–7. ISBN 978-0-19-509539-5.
- "Greek Names of the Planets". Retrieved 2012-07-14. "The Greek name of the planet Saturn is Kronos. The Titan Cronus was the father of Zeus, while Saturn was the Roman God of agriculture." See also the Greek article about the planet.
- "Popular Miscellany – Superstitions about Saturn". The Popular Science Monthly: 862. April 1893.
- China: De Groot, Jan Jakob Maria (1912). "Religion in China: universism. a key to the study of Taoism and Confucianism". American lectures on the history of religions 10 (G. P. Putnam's Sons). p. 300. Retrieved 2010-01-08.
Japan: Crump, Thomas (1992). "The Japanese numbers game: the use and understanding of numbers in modern Japan". Nissan Institute/Routledge Japanese studies series (Routledge). pp. 39–40. ISBN 0415056098.
Korea: Hulbert, Homer Bezaleel (1909). The passing of Korea. Doubleday, Page & company. p. 426. Retrieved 2010-01-08.
- Cessna, Abby (November 15, 2009). "When Was Saturn Discovered?". Universe Today. Archived from the original on 2011-10-05. Retrieved July 21, 2011.
- Eastman, Jack (1998). "Saturn in Binoculars". The Denver Astronomical Society. Archived from the original on 2011-08-21. Retrieved 2008-09-03.
- Chan, Gary (2000). "Saturn: History Timeline". Archived from the original on 2011-08-21. Retrieved 2007-07-16.
- Cain, Fraser (2008-07-03). "History of Saturn". Universe Today. Archived from the original on 2011-10-05. Retrieved 2011-07-24.
- Cain, Fraser (July 7, 2008). "Interesting Facts About Saturn". Universe Today. Archived from the original on 2011-10-05. Retrieved September 17, 2011.
- Cain, Fraser (2009-11-27). "Who Discovered Saturn?". Universe Today. Archived from the original on 2011-10-05. Retrieved 2011-09-17.
- Micek, Catherine. "Saturn: History of Discoveries". Archived from the original on 2011-08-21. Retrieved 2007-07-15.
- Barton, Samuel G. (April 1946). "The names of the satellites". Popular Astronomy 54: 122–130. Bibcode:1946PA.....54..122B.
- Kuiper, Gerard P. (November 1944). "Titan: a Satellite with an Atmosphere". Astrophysical Journal 100: 378–388. Bibcode:1944ApJ...100..378K. doi:10.1086/144679.
- "The Pioneer 10 & 11 Spacecraft". Mission Descriptions. Archived from the original on 2006-01-30. Retrieved 2007-07-05.
- "Missions to Saturn". The Planetary Society. 2007. Archived from the original on 2011-08-21. Retrieved 2007-07-24.
- Lebreton, Jean-Pierre et al. (December 2005). "An overview of the descent and landing of the Huygens probe on Titan". Nature 438 (7069): 758–764. Bibcode:2005Natur.438..758L. doi:10.1038/nature04347. PMID 16319826.
- "Astronomers Find Giant Lightning Storm At Saturn". ScienceDaily LLC. 2007. Archived from the original on 2011-08-21. Retrieved 2007-07-27.
- Pence, Michael (March 9, 2006). "NASA's Cassini Discovers Potential Liquid Water on Enceladus". NASA Jet Propulsion Laboratory. Archived from the original on 2011-08-21. Retrieved 2011-06-03.
- Lovett, Richard A. (May 31, 2011). "Enceladus named sweetest spot for alien life". Nature (Nature). doi:10.1038/news.2011.337. Archived from the original on 2011-10-05. Retrieved 2011-06-03.
- Kazan, Casey (June 2, 2011). "Saturn's Enceladus Moves to Top of "Most-Likely-to-Have-Life" List". The Daily Galaxy. Archived from the original on 2011-08-21. Retrieved 2011-06-03.
- Shiga, David (September 20, 2007). "Faint new ring discovered around Saturn". NewScientist.com. Archived from the original on 2011-08-21. Retrieved 2007-07-08.
- Rincon, Paul (March 14, 2007). "Probe reveals seas on Saturn moon". BBC. Archived from the original on 2011-10-05. Retrieved 2007-09-26.
- Rincon, Paul (November 10, 2006). "Huge 'hurricane' rages on Saturn". BBC. Archived from the original on 2011-10-05. Retrieved 2007-07-12.
- "Mission overview – introduction". Cassini Solstice Mission. NASA / JPL. 2010. Archived from the original on 2011-08-21. Retrieved 2010-11-23.
- "Massive storm at Saturn's north pole". 3 News NZ. April 30, 2013.
- Overbye, Dennis (November 12, 2013). "The View From Saturn". New York Times. Retrieved November 12, 2013.
- "Why do Saturn's rings Sometimes Disappear?". Google News. Retrieved 4 August 2013.
- "Saturn's Rings Edge-On". Classical Astronomy. 2013. Retrieved 4 August 2013.
- Schmude, Richard W Jr (2003). "Saturn in 2002–03". Georgia Journal of Science. Archived from the original on 2007-10-16. Retrieved 2007-10-14.
- Tanya Hill; Jonti Horner (9 May 2014). "Bright Saturn will blink out across Australia – for an hour, anyway". The Conversation. Retrieved 11 May 2014.
- Bilstein, Roger E. (1999). Stages to Saturn: A Technological History of the Apollo/Saturn Launch Vehicle. DIANE Publishing. p. 37. ISBN 0-7881-8186-6.
- Plotner, Tammy (February 22, 2008). "Time to Observe Saturn – Opposition Occurs February 23!". Universe Today. Archived from the original on 2011-10-05. Retrieved 2011-07-19.
- Reis, Ricardo Cardoso; Jones, Jane H. "Saturn: The Ringed Planet" (PDF). IAU. Retrieved 2011-07-23.
- Lovett, L.; Horvath, J.; Cuzzi, J. (2006). Saturn: A New View. New York: Harry N. Abrams, Inc. ISBN 978-0-8109-3090-2.
- Karttunen, H.; Kröger, P.; et al. (2007). Fundamental Astronomy. New York: Springer, 5th edition. ISBN 978-3-540-34143-7.
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- Astronomy Cast: Saturn
- Saturn in Daytime (12 inch telescope)
- Saturn 'Rev 175' Raw Preview
- Haese, Paul. "Capturing Saturn". Sixty Symbols. Brady Haran for the University of Nottingham.