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Encyclopedia > Mimas (moon)
Mimas
Mimas, as imaged by Cassini in 2005 (NASA)
Discovery
Discovered by: William Herschel
Discovery date: September 17, 1789 [1]
Orbital characteristics
Semi-minor axis: 185,404 km
Eccentricity: 0.0202 [1]
Orbital period: 0.9424218 d [2]
Inclination: 1.51° (to Saturn's equator)
Satellite of: Saturn
Physical characteristics
Dimensions: 414.8×394.4×381.4 km (0.0311 Earths)[2]
Mean radius: 198.30 ± 0.30 km [3]
Surface area: ~490,000 km²
Volume: ~32,900,000 km3
Mass: 3.7493 ± 0.0031×1019 kg [3] [4]
(6.3×10-6 Earths)
Mean density: 1.1479 ± 0.0053 g/cm3 [3]
Equatorial surface gravity: 0.0636 m/s2
Escape velocity: 0.159 km/s
Rotation period: synchronous
Axial tilt: zero
Albedo: 0.962 ± 0.004 (geometric)[5]
Temperature: ~64 K

Mimas (mee'-məs or mye'-məs, IPA: [ˈmɪməs,ˈmaɪməs], Greek Μίμᾱς, rarely Μίμανς) is a moon of Saturn that was discovered in 1789 by William Herschel.[6] It is named after Mimas, a son of Gaia in Greek mythology, and is also designated Saturn I. Image File history File links Mimas, Saturns moon. ... For other persons named William Herschel, see William Herschel (disambiguation). ... September 17 is the 260th day of the year (261st in leap years). ... 1789 was a common year starting on Thursday (see link for calendar). ... Two bodies with a slight difference in mass orbiting around a common barycenter. ... In geometry, the semi-minor axis (also semiminor axis) applies to ellipses and hyperbolas. ... A kilometer (Commonwealth spelling: kilometre), symbol: km is a unit of length in the metric system equal to 1,000 metres (from the Greek words χίλια (khilia) = thousand and μέτρο (metro) = count/measure). ... (This page refers to eccitricity in astrodynamics. ... The orbital period is the time it takes a planet (or another object) to make one full orbit. ... Inclination in general is the angle between a reference plane and another plane or axis of direction. ... A natural satellite is an object that orbits a planet or other body larger than itself and which is not man-made. ... Atmospheric characteristics Atmospheric pressure 140 kPa Hydrogen >93% Helium >5% Methane 0. ... In mathematics, a spheroid is a quadric surface in three dimensions obtained by rotating an ellipse about one of its principal axes. ... Square kilometre (US spelling: Square kilometer), symbol km², is an SI unit of surface area. ... The volume of a solid object is the three-dimensional concept of how much space it occupies, often quantified numerically. ... A cubic kilometre (symbol km³) is an SI derived unit of volume. ... Unsolved problems in physics: What causes anything to have mass? The U.S. National Prototype Kilogram, which currently serves as the primary standard for measuring mass in the U.S. Mass is the property of a physical object that quantifies the amount of matter and energy it is equivalent to. ... The U.S. National Prototype Kilogram, which currently serves as the primary standard for measuring mass in the U.S. It was assigned to the United States in 1889 and is periodically recertified and traceable to the primary international standard, The Kilogram, held at the Bureau International des Poids et... In physics, density is defined as mass m per unit volume V. For the common case of a homogeneous substance, it is expressed as: where, in SI units: ρ (rho) is the density of the substance, measured in kg·m-3 m is the mass of the substance, measured in kg... The surface gravity of a Killing horizon is the acceleration, as exerted at infinity, needed to keep an object at the horizon. ... Acceleration is the time rate of change of velocity, and at any point on a velocity-time graph, it is given by the slope of the tangent to that point In physics or physical science, acceleration (symbol: a) is defined as the rate of change (or derivative with respect to... Space Shuttle Atlantis launches on mission STS-71 In physics, for a given gravitational field and a given position, the escape velocity is the minimum speed an object without propulsion, at that position, needs to have to move away indefinitely from the source of the field, as opposed to falling... In astronomy, a rotation period is the time an astronomical object takes to complete one revolution around its rotation axis. ... In astronomy, synchronous rotation is a planetological term describing a body orbiting another, where the orbiting body takes as long to rotate on its axis as it does to make one orbit; and therefore always keeps the same hemisphere pointed at the body it is orbiting. ... Axial tilt is an astronomical term regarding the inclination angle of a planets rotational axis in relation to its orbital plane. ... Albedo is the ratio of reflected to incident electromagnetic radiation power. ... The geometric albedo of an astronomical body is the ratio of its total brightness at zero phase angle to that of an idealised fully reflecting, diffusively scattering (Lambertian) disk with the same cross-section. ... Fig. ... Not to be confused with the NATO phonetic alphabet, which has also informally been called the “International Phonetic Alphabet”. For information on how to read IPA transcriptions of English words, see IPA chart for English. ... A natural satellite is an object that orbits a planet or other body larger than itself and which is not man-made. ... Atmospheric characteristics Atmospheric pressure 140 kPa Hydrogen >93% Helium >5% Methane 0. ... 1789 was a common year starting on Thursday (see link for calendar). ... For other persons named William Herschel, see William Herschel (disambiguation). ... Mimas may refer to: Mimas, son of Gaia in Greek mythology, was one of the Giants slain by Heracles. ... For other uses, see Gaia. ... The bust of Zeus found at Otricoli (Sala Rotonda, Museo Pio-Clementino, Vatican) Greek mythology is the telling of stories created by the ancient Greeks, concerning their gods and heroes, the nature of the general, on the ancient Greek civilization. ...

Contents

Discovery

The great light of my forty-foot telescope was so useful that on the 17th of September, 1789, I remarked the seventh satellite, then situated at its greatest western elongation.

 
— William Herschel, Philosophical Transactions of the Royal Society of London, Vol. 80 [7]

Name

Mimas is named after one of the Titans in Greek mythology. The names of all seven then-known satellites of Saturn, including Mimas, were suggested by William Herschel's son John in his 1847 publication Results of Astronomical Observations made at the Cape of Good Hope.[8] He named them after Titans specifically because Saturn (the Roman equivalent of Kronos in Greek mythology), was the leader of the Titans. In Greek mythology, the Titans (Greek , plural ) were greater even than the gods. ... The bust of Zeus found at Otricoli (Sala Rotonda, Museo Pio-Clementino, Vatican) Greek mythology is the telling of stories created by the ancient Greeks, concerning their gods and heroes, the nature of the general, on the ancient Greek civilization. ... John Herschel Sir John Frederick William Herschel (7 March 1792 – 11 May 1871) was an English mathematician and astronomer. ... 1847 was a common year starting on Friday (see link for calendar). ... Chronos is the personification of time in Greek mythology There is also Cronus, the similarly named Greek mythological Titan, father of Zeus. ...


According to Liddell and Scott's Greek-English Lexicon, the adjectival form of Mimas would be Mimantean (the genitive case is Latin Mimantis, Greek Μῑμάντος). In practice, anglicisms such as Mimasian and Mimian are very occasionally seen, but more commonly writers simply use the phrase 'of Mimas'. A Greek-English Lexicon is the standard lexicographical work of the ancient Greek language, begun in the nineteenth century and now in its ninth (revised) edition. ... It has been suggested that this article or section be merged with Possessive case. ...


Physical characteristics

Mimas' low density (1.17) indicates that it is composed mostly of water ice with only a small amount of rock. Due to the tidal forces acting on it, the moon is not perfectly spherical; its longest axis is about 10% longer than the shortest. The somewhat ovoid shape of Mimas is especially noticeable in recent images from the Cassini probe. In geometry, an oval or ovoid (from Latin ovum, egg) is any curve resembling an egg or an ellipse. ... Cassini-Huygens is a joint NASA/ESA/ASI unmanned space mission intended to study Saturn and its moons. ...

Mimas, imaged by Cassini, looking notably egg-shaped
Mimas, imaged by Cassini, looking notably egg-shaped
Mimas, silhouetted against Saturn's northern latitudes

Mimas' most distinctive feature is a colossal impact crater 130 km across, named Herschel after the moon's discoverer. Herschel's diameter is almost a third of the moon's own diameter; its walls are approximately 5 km high, parts of its floor measure 10 km deep, and its central peak rises 6 km above the crater floor. If there were a crater of an equivalent scale on Earth it would be over 4,000 km in diameter, wider than Canada. The impact that made this crater must have nearly shattered Mimas: fractures can be seen on the opposite side of Mimas that may have been created by shock waves from the impact travelling through the moon's body. Mimas, imaged by the Cassini orbiter, showing the moons ovoidal shape. ... Mimas, imaged by the Cassini orbiter, showing the moons ovoidal shape. ... Image File history File linksMetadata Download high resolution version (889x1012, 588 KB) Summary Minas (moon of Saturn), NASA [1] Licensing File links The following pages link to this file: Mimas (moon) Metadata This file contains additional information, probably added from the digital camera or scanner used to create or digitize... Image File history File linksMetadata Download high resolution version (889x1012, 588 KB) Summary Minas (moon of Saturn), NASA [1] Licensing File links The following pages link to this file: Mimas (moon) Metadata This file contains additional information, probably added from the digital camera or scanner used to create or digitize... Tycho crater on Earths moon. ... Herschel is a huge crater on the Saturnian moon Mimas. ... Adjectives: Terrestrial, Terran, Telluric, Tellurian, Earthly Atmosphere Surface pressure: 101. ...


The surface is saturated with smaller impact craters, but no others are anywhere near the size of Herschel. Although Mimas is heavily cratered, the cratering is not uniform. Most of the surface is covered with craters greater than 40 km in diameter, but in the south polar region, craters greater than 20 km are generally lacking. This suggests that some process removed the larger craters from these areas.


Scientists officially recognise two types of geological features on Mimas: craters and chasmata (chasms). See also: List of geological features on Mimas. Tycho crater on Earths moon. ... Chasma (pl. ... This is a list of named geological features on Mimas. ...


Mimas is responsible for clearing the material from the Cassini Division, the gap between Saturn's two widest rings, A Ring and B Ring. Particles at the inner edge of the Cassini division are in a 2:1 resonance with Mimas. They orbit twice for each orbit of Mimas. The repeated pulls by Mimas on the Cassini division particles, always in the same direction in space, force them into new orbits outside the gap. Other resonances with Mimas are also responsible for other features in Saturn's rings: the boundary between the C and B ring is at the 3:1 resonance and the outer F ring shepard, Pandora, is at the 3:2 resonance. Categories: Astronomy stubs ... In this image of Saturn, the A Ring is the outer of the two wide rings The A ring is one of the rings of Saturn. ... Categories: Astronomy stubs ... In celestial mechanics, an orbital resonance occurs when two orbiting bodies exert a regular, periodic gravitational influence on each other. ... Pandora (pan-dor-a, Greek Πανδώρα) is a moon of Saturn. ...


Mimas in fiction and film

Comparison of Mimas to the Death Star
Comparison of Mimas to the Death Star
  • Mimas closely resembles the Death Star in the Star Wars films. This is purely coincidental; the Death Star was designed and created long before the first photographs of Mimas were taken.
  • Mimas is featured in the book "Red Dwarf: Infinity welcomes careful drivers" as the moon Dave Lister lives on prior to his acceptance into the mining ship Red Dwarf.
  • Mimas is the site of a Federation waystation in the Star Trek universe.

Image File history File links Taken from NASA via here, but NASA doesnt have the right to the Death Star image and both are tiny in any case. ... Saturn and its moons Several of Saturns natural satellites of have figured prominently in works of science fiction. ... The first Death Star, with TIE Fighters flying from it The Death Star was an enormous military battle station in the fictional Star Wars universe. ... Opening logo to the Star Wars films Star Wars is an epic science fantasy saga and fictional universe created by writer/producer/director George Lucas during the 1970s. ... The current Star Trek franchise logo Star Trek is an American science fiction franchise. ...

References

  1. ^ Imago Mundi - La Découverte des satellites de Saturne (French).
  2. ^ P.C. Thomas et al (2006). Shapes of the Saturnian Icy Satellites. 37th Lunar and Planetary Science Conference. Retrieved on November 26, 2006.
  3. ^ a b c Jacobson, R. A.; Antreasian, P. G.; Bordi, J. J.; Criddle, K. E.; et.al. (December 2006). "The gravity field of the saturnian system from satellite observations and spacecraft tracking data". The Astronomical Journal 132: 2520-2526. 
  4. ^ R.A. Jacobson et al (2005). "The GM values of Mimas and Tethys and the libration of Methone". Astronomical Journal 132: 711. 
  5. ^ A. Verbiscer et al. (2007). "Enceladus: Cosmic Graffiti Artist Caught in the Act". Science 315: 815.
  6. ^ Herschel, W. (1790). "Account of the Discovery of a Sixth and Seventh Satellite of the Planet Saturn; With Remarks on the Construction of Its Ring, Its Atmosphere, Its Rotation on an Axis, and Its Spheroidical Figure". Philosophical Transactions of the Royal Society of London 80: 1–20. 
  7. ^ Herschel (1790), reported by Arago, M. (1871). "Herschel". Annual Report of the Board of Regents of the Smithsonian Institution: 198–223. Retrieved on 2006-11-26. 
  8. ^ Lassell (1848). "Satellites of Saturn: Observations of Mimas, the closest and most interior Satellite of Saturn". Monthly Notices of the Royal Astronomical Society 8: 42. Retrieved on 2006-11-26. 

November 26 is the 330th day (331st on leap years) of the year in the Gregorian calendar. ... For the Manfred Mann album, see 2006 (album). ... For the Manfred Mann album, see 2006 (album). ... November 26 is the 330th day (331st on leap years) of the year in the Gregorian calendar. ... For the Manfred Mann album, see 2006 (album). ... November 26 is the 330th day (331st on leap years) of the year in the Gregorian calendar. ...

External links

... | Janus | Mimas | Methone | ...

  Results from FactBites:
 
Mimas (moon) - Wikipedia, the free encyclopedia (599 words)
Mimas (mye'-məs, IPA /ˈmaɪməs/, Greek Μίμᾱς, rarely Μίμανς) is a moon of Saturn that was discovered in 1789 by William Herschel.
Mimas' most distinctive feature is a colossal impact crater 130 km across, named Herschel after the moon's discoverer.
Mimas is responsible for clearing the material from the Cassini Division, the gap between Saturn's two widest rings, A Ring and B Ring.
Mimas, A Moon of Saturn (1673 words)
During its approach to Mimas on Aug. 2, 2005, the Cassini spacecraft narrow-angle camera obtained multi-spectral views of the moon from a range of 228,000 kilometers (142,500 miles).
This image of Mimas was acquired by the Voyager 1 spacecraft on November 11, 1980 from a range of 425,000 kilometers (264,000 miles).
The diameter of Mimas is 397 kilometers (247 miles), Dione is 1,118 kilometers (695 miles) and Rhea is 1,528 kilometers (949 miles).
  More results at FactBites »

 
 

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