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Encyclopedia > Polydeuces (moon)
Saturn's moon Polydeuces
Saturn's moon Polydeuces
Polydeuces
Discovery
Discovered by Cassini Imaging Science Team
Discovered on 24 October 2004
Orbital characteristics
mean Semimajor axis 377,396 km[1]
Eccentricity 0.0192[2]
Orbital period 2.736915 d[1]
Inclination 0.1774 ± 0.0015°[2]
Is a satellite of Saturn
Physical characteristics
Mean diameter 3.5 km[3]
Mass 1 − 5 ×1013 kg (based on density 0.5 − 2 g/cm³)
Mean density unknown
Surface gravity unknown
Rotation period assumed synchronous
Axial tilt unknown
Albedo unknown
Surface temperature
min mean max
Atmosphere none

Polydeuces (pol'-ee-dew'-seez, IPA: [ˈpɑliˈdjuːsiz], Greek Πολυδεύκης) is a very small natural satellite of Saturn that is co-orbital with Dione and librates around the trailing Lagrangian point (L5). Its diameter is estimated to be about 3.5 km.[3]. Image File history File links Polydeuces. ... Image File history File links Polydeuces. ... October 24 is the 297th day of the year (298th in leap years) in the Gregorian calendar, with 68 days remaining. ... 2004 (MMIV) was a leap year starting on Thursday of the Gregorian calendar. ... m. ... In geometry, the semi-major axis (also semimajor axis) a 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). ... In astrodynamics, under standard assumptions any orbit must be of conic section shape. ... 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. ... DIAMETER is an AAA protocol (Authentication, Authorization and Accounting) succeeding its predecessor RADIUS. // The name is a pun on the RADIUS protocol, which is the predecessor (a diameter is twice the radius). ... 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 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 V is... Gravity is a force of attraction that acts between bodies that have mass. ... On a prograde planet like the Earth, the sidereal day is shorter than the solar day. ... 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. ... Fig. ... Atmosphere is the general name for a layer of gases that may surround a material body of sufficient mass. ... 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. ... Atmosphere none Dione (dye-oe-nee, Greek Διώνη) is a moon of Saturn discovered by Giovanni Cassini in 1684. ... A contour plot of the effective potential (the Hills Surfaces) of a two-body system (the Sun and Earth here), showing the five Lagrange points. ...


Polydeuces was discovered by Carolyn Porco and the Cassini Imaging Team on October 24, 2004[4],[5],[6],[3] in images taken on October 21, 2004 by the Cassini Imaging Team and given the temporary designation S/2004 S 5. Subsequent searches of earlier Cassini imaging showed it in images as far back as April 9, 2004[7]. Polydeuces is also designated as Saturn XXXIV. October 24 is the 297th day of the year (298th in leap years) in the Gregorian calendar, with 68 days remaining. ... 2004 (MMIV) was a leap year starting on Thursday of the Gregorian calendar. ... October 21 is the 294th day of the year (295th in leap years) in the Gregorian Calendar, with 71 days remaining. ... 2004 (MMIV) was a leap year starting on Thursday of the Gregorian calendar. ... April 9 is the 99th day of the year in the Gregorian calendar (100th in leap years). ... 2004 (MMIV) was a leap year starting on Thursday of the Gregorian calendar. ...


Of the known Lagrangian co-orbitals in the Saturn system, Polydeuces wanders the furtherest from its Lagrangian point. The libration takes it away from the L5 by up to 31.4° in the direction away from Dione, and 26.1° towards it with a period of 790.931 days (for comparison L5 trails Dione by 60°)[2]. Polydeuces' libration is large enough that it takes on some qualities of a tadpole orbit, as evidenced by the clear asymmetry between excursions towards and away from Dione. In the course of one such cycle, Polydeuces' orbital radius also varies by about ± 7660 km with respect to Dione's[7]. The animation shows a set of simulated views of the Moon over one month, like a picture taken at the same time each day. ...


The name Polydeuces was approved by the IAU Working Group on Planetary System Nomenclature on January 21, 2005. In Greek mythology, Polydeuces is another name for Pollux, twin brother of Castor, son of Zeus and Leda. January 21 is the 21st day of the year in the Gregorian calendar. ... 2005 (MMV) was a common year starting on Saturday of the Gregorian calendar. ... 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 world and their own cult and ritual practices. ... In Greek mythology, Castor (or Kastor) and Polydeuces (sometimes called Pollux) were the twin sons of Leda and the brothers of Helen of Troy and Clytemnestra. ... In Greek mythology, Castor (or Kastor) and Polydeuces (sometimes called Pollux) were the twin sons of Leda and the brothers of Helen of Troy and Clytemnestra. ... The Statue of Zeus at Olympia Phidias created the 12-m (40-ft) tall statue of Zeus at Olympia about 435 BC. The statue was perhaps the most famous sculpture in Ancient Greece, imagined here in a 16th century engraving Zeus (in Greek: nominative: Zeús, genitive: Diós), is... In Greek mythology, Leda was a Spartan queen, wife of Tyndareus and mother of the double sets of mixed twins, Castor and Polydeuces and Clytemnestra and Helen, as well as Phoebe and Philonoe. ...


References

  1. ^ a b The mean semi-major axis and period must be identical to Dione's.
  2. ^ a b c J.N. Spitale et al (2006). "The orbits of Saturn's small satellites derived from combined historic and Cassini imaging observations". The Astronomical Journal 132: 692. 
  3. ^ a b c C. C. Porco et al. (2005), Cassini Imaging Science: Initial Results on Saturn's Rings and Small Satellites. Science 307 (5713): 1226-1236.
  4. ^ The official attribution for sightings of new moons or rings made by the Cassini imaging scientists in Cassini images goes to the Cassini Imaging Team. This is sanctioned by the International Astronomical Union. The IAU Circulars are the offical announcement of these discoveries, with the authorship 'C.C.Porco and the Cassini Imaging Team'. That is the correct attribution for these discoveries.
  5. ^ IAUC 8432 - discovery announcement (November 8, 2004)
  6. ^ IAUC 8471 - naming of Polydeuces (January 21, 2005)
  7. ^ a b C.D. Murray et al (2005). "S/2004 S 5: A new co-orbital companion for Dione". Icarus 179: 222. 

Atmosphere none Dione (dye-oe-nee, Greek Διώνη) is a moon of Saturn discovered by Giovanni Cassini in 1684. ... November 8 is the 312th day of the year (313th in leap years) in the Gregorian calendar, with 53 days remaining. ... 2004 (MMIV) was a leap year starting on Thursday of the Gregorian calendar. ... January 21 is the 21st day of the year in the Gregorian calendar. ... 2005 (MMV) was a common year starting on Saturday of the Gregorian calendar. ...

External links

... | Telesto, Tethys and Calypso | Polydeuces, Dione and Helene | Rhea | ...

  Results from FactBites:
 
Polydeuces (moon) - Wikipedia, the free encyclopedia (179 words)
Polydeuces (pol'-ee-dew'-seez, IPA /ˈpɑliˈdjuːsiz/, Greek Πολυδεύκης) is a natural satellite of Saturn that was discovered in images taken on October 21, 2004 by the Cassini imaging team, led by Carolyn C. Porco et al, and given the temporary designation S/2004 S 5.
The name Polydeuces was approved by the IAU Working Group on Planetary Science Nomenclature on January 21, 2005.
In Greek mythology, Polydeuces is another name for Pollux, brother of Castor.
Castor and Polydeuces at AllExperts (531 words)
In Greek mythology, Castor (or Kastor) and Polydeuces (sometimes called Pollux) were the twin sons of Leda and the brothers of Helen of Troy and Clytemnestra.
Castor and Polydeuces abducted and married Phoebe and Hilaeira, the daughters of Leucippus.
Polydeuces was granted immortality by Zeus, and further persuaded Zeus to share his gift with Castor.
  More results at FactBites »


 

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