| Discovery [1] | |
|---|---|
| Discovered by | J. J. Kavelaars B. J. Gladman |
| Discovered | in 2000 |
| Mean Orbital elements [2] | |
| Epoch 2000 Feb. J-John Kavelaars, better known as JJ Kavelaars, is a Canadian astronomer who was part of a team that discovered several moons Brett J Gladman, born April 19 1966 is a Canadian Astronomer and an Associate Professor at the University of British Columbia 's Department of Physics In Physics, an orbit is the gravitationally curved path of one object around a point or another body for example the gravitational orbit of a planet around a star In Astronomy, an epoch is a moment in time used as a reference for the Orbital elements of a Celestial body. 26. 00 | |
| Semi-major axis | 11. In Geometry, the semi-major axis (also semimajor axis) is used to describe the dimensions of ellipses and hyperbolae 124 Gm |
| Eccentricity | 0. The metre or meter is a unit of Length. It is the basic unit of Length in the Metric system and in the International In Astrodynamics, under standard assumptions, any Orbit must be of Conic section shape 3163 |
| Inclination | 46. Inclination in general is the Angle between a Reference plane and another plane or axis of direction 444° * |
| Orbital period | 451. The orbital period is the time taken for a given object to make one complete Orbit about another object 4 d (1. 24 yr) |
| Physical characteristics | |
| Mean diameter | 12 km[3] ** |
| Rotation period | ? |
| Albedo | 0. Geometry, a diameter of a Circle is any straight Line segment that passes through the center of the circle and whose Endpoints are on the Sidereal time is a measure of the position of the Earth in its rotation around its axis or time measured by the apparent Diurnal motion of the Vernal equinox The albedo of an object is the extent to which it diffusely reflects light from the sun 04[3] assumed |
| Color | red B-V=1. In Astronomy, the color index is a simple numerical expression that determines the color of an object which in the case of a Star gives its Temperature 05 R-V=0. 58[4] |
| Spectral type | (redder than D)[4] |
| *to the ecliptic **based on the albedo | |
Ijiraq (pronounced /ˈiːɨrɑːk/ EE-yə-raak, or /ˈiːdʒɨrɑːk/ EE-jə-raak) is a prograde irregular satellite of Saturn. Asteroids are assigned a type based on spectral shape Color, and sometimes Albedo. D-type asteroids have a very low Albedo and a featureless reddish Electromagnetic spectrum. The ecliptic is the apparent path that the Sun traces out in the sky during the year Direct motion is the motion of a Planetary body in a direction similar to that of other bodies within its system and is sometimes called prograde motion. In Astronomy, an irregular moon is a Natural satellite following a distant inclined, and often retrograde Orbit. A natural satellite or moon is a Celestial body that Orbits a Planet or smaller body which is called the primary. It was discovered by the team of Brett Gladman, John J. Kavelaars, et al. Brett J Gladman, born April 19 1966 is a Canadian Astronomer and an Associate Professor at the University of British Columbia 's Department of Physics J-John Kavelaars, better known as JJ Kavelaars, is a Canadian astronomer who was part of a team that discovered several moons in 2000, and given the temporary designation S/2000 S 6. 2000 ( MM) was a Leap year that started on Saturday of the Common Era, in accordance with the Gregorian calendar. [5][6] It was named in 2003 after the Ijiraq, a creature of Inuit mythology[7]. In Inuit mythology the ijiraq is a sort of Boogeyman who kidnaps children and hides them away and abandons them Inuit mythology has many similarities to the Religions of other Polar regions Inuit traditional religious practices could be very briefly summarised as a
Contents |
Orbit
Ijiraq orbits Saturn at an average distance of 11. The Inuit group is a dynamical grouping of the Prograde Irregular satellites Saturn which follow similar Orbits Their semi-major axes The Gallic group is a dynamical grouping of the Prograde Irregular satellites of Saturn following similar Orbits Their semi-major axes 1 Gm in 451 days on an orbit very similar to Kiviuq's. Kiviuq (ˈkiːvioʊk KEE-vee-ohk or KIV-ee-ook is a Prograde irregular satellite of Saturn The diagram illustrates its orbit in relation to other prograde irregular satellites of Saturn. The eccentricity of the orbits is represented by the yellow segments extending from the pericentre to the apocentre. In Celestial mechanics, an apsis, plural apsides (ˈæpsɨdɪːz is the point of greatest or least distance of the Elliptical orbit of an object from In Celestial mechanics, an apsis, plural apsides (ˈæpsɨdɪːz is the point of greatest or least distance of the Elliptical orbit of an object from
Ijiraq is believed to be in Kozai resonance i. In Celestial mechanics, the Kozai mechanism is a secular perturbative effect on certain orbits e. its orbit is cyclically reducing the inclination while increasing the eccentricity and vice versa. The orbit’s argument of pericenter oscillates around 90° with an amplitude of 60°. The argument of periapsis (or argument of perifocus) ( ω) is the Orbital element describing the Angle of an Orbiting body's periapsis [8]
Physical characteristics
While Ijiraq is a member of the Inuit group of irregular satellites,[9] recent observations revealed that Ijiraq is distinctively redder than Paaliaq, Siarnaq and Kiviuq. The Inuit group is a dynamical grouping of the Prograde Irregular satellites Saturn which follow similar Orbits Their semi-major axes Paaliaq (ˈpɑːliɑːk PAH-lee-ahk is a Prograde irregular satellite of Saturn. Siarnaq (ˈsiːɑrnɑːk SEE-ar-naak or Saturn XXIX, is a Prograde irregular satellite of Saturn. Its spectral slope (a measure of body reflectance in function of the wavelength) is twice as steep as for other members (20% per 100 nm), typical for red Trans-Neptunian Objects like Sedna but unknown for irregular satellites. In Astrophysics and Planetary science, spectral slope is a measure of dependence of the Reflectance on the Wavelength. In photometry and Heat transfer, reflectivity is the fraction of incident radiation reflected by a surface In Physics wavelength is the distance between repeating units of a propagating Wave of a given Frequency. A trans-Neptunian object (TNO is any object in the Solar system that Orbits the sun at a greater distance on average than Neptune. TemplateInfobox Planet.--> 90377 Sedna (ˈsɛdnə) is a Trans-Neptunian In Astronomy, an irregular moon is a Natural satellite following a distant inclined, and often retrograde Orbit. In addition, unlike the other three, Ijiraq's spectrum lacks the weak absorption near 0. 7 μm, attributed to a possible water hydration. [4]
Name
Kavelaars, an astronomer at McMaster University, suggested this name to help astronomical nomenclature to get out of its Greco-Romano-Renaissance rut. McMaster redirects here for others see McMaster (disambiguation. In modern Olympic and amateur Wrestling, Greco-Roman wrestling is a particular style and variation The Renaissance (from French Renaissance, meaning "rebirth" Italian: Rinascimento, from re- "again" and nascere He spent several months trying to find names that were both multi-cultural and Canadian, consulting Amerindian scholars without finding a name that seemed appropriate. Country to "Dominion of Canada" or "Canadian Federation" or anything else please read the Talk Page For indigenous peoples in the United States other than Hawaii and Alaska see also Native Americans in the United States. In March 2001, he was reading an Inuit tale to his children and had a revelation. Year 2001 ( MMI) was a Common year starting on Monday according to the Gregorian calendar. The ijiraq plays at hide-and-seek, which is what these small moons of Saturn do: they are hard to find, and cold like the Canadian arctic (the team of discoverers includes Canadians, Norwegians and Icelanders—Nordicity is their common trait). Hide and seek (abbreviated HandS, sometimes also called hide and go seek) is a variant of the game tag, in which one or more players search for the other Norway ( Norwegian: Norge ( Bokmål) or Noreg ( Nynorsk) officially the Kingdom of Norway, is a Constitutional Iceland, officially the Republic of Iceland ( ( Ísland or Lýðveldið Ísland ( The Nordic countries make up a region in Northern Europe called the Nordic region, consisting of Denmark, Finland, Iceland, Kavelaars contacted the author of the tale, Michael Kusugak, to get his assent, and the latter also suggested the names for Kiviuq and 90377 Sedna. Kiviuq (ˈkiːvioʊk KEE-vee-ohk or KIV-ee-ook is a Prograde irregular satellite of Saturn TemplateInfobox Planet.--> 90377 Sedna (ˈsɛdnə) is a Trans-Neptunian
References
- ^ Discovery Circumstances (JPL)
- ^ Mean orbital parameters from JPL
- ^ a b Scott Sheppard pages
- ^ a b c Grav, T. ; and Bauer, J. ; A deeper look at the colors of Saturnian irregular satellites
- ^ IAUC 7521: S/2000 S 5, S/2000 S 6 2000 November 18 (discovery)
- ^ MPEC 2000-Y14: S/2000 S 3, S/2000 S 4, S/2000 S 5, S/2000 S 6, S/2000 S 10 2000 December 19 (discovery and ephemeris)
- ^ IAUC 8177: Satellites of Jupiter, Saturn, Uranus 2003 August 8 (naming the moon)
- ^ Nesvorný, D. 2000 ( MM) was a Leap year that started on Saturday of the Common Era, in accordance with the Gregorian calendar. Events 326 - The old St Peter's Basilica is consecrated 1302 - Pope Boniface VIII issues the Papal bull 2000 ( MM) was a Leap year that started on Saturday of the Common Era, in accordance with the Gregorian calendar. Events 324 - Licinius abdicates his position as Roman Emperor. Year 2003 ( MMIII) was a Common year starting on Wednesday of the Gregorian calendar. Events 1220 - Sweden is defeated by Estonian tribes in the Battle of Lihula. ; Alvarellos, Jose L. A. ; Dones, L. ; and Levison, H. F.; Orbital and Collisional Evolution of the Irregular Satellites, The Astronomical Journal, 126 (2003), pp. Harold F "Hal" Levison is a Planetary scientist specializing in planetary dynamics 398–429
- ^ Gladman, B. J. ; Nicholson, P. D. ; Burns, J. A. ; Kavelaars, J. J. ; Marsden, B. G.; Holman, M. J.; Grav, T. Brian Geoffrey Marsden (born 5 August 1937 is a British Astronomer, the longtime director of the Minor Planet Center (MPC at the Harvard-Smithsonian Center Matthew J Holman (* 1967 is a Smithsonian Astrophysicist and lecturer at Harvard University. ; Hergenrother, C. W.; Petit, J. Carl W Hergenrother is an American Astronomer. Working with the Catalina Sky Survey and other colleagues he has co-discovered a number of Comets -M. ; Jacobson, R. A. ; and Gray, W. J. ; Discovery of 12 satellites of Saturn exhibiting orbital clustering, Nature, 412 (2001 July 12), pp. Year 2001 ( MMI) was a Common year starting on Monday according to the Gregorian calendar. Events 1191 - Saladin 's garrison surrenders ending the two-year Siege of Acre. 163–166
- Ephemeris from IAU-MPC NSES
External links
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