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| magnitude = 16.7 ([[Opposition (astronomy and astrology)|opposition]])<ref name=AstDys/><ref name=Horizons/>
| magnitude = 16.7 ([[Opposition (astronomy and astrology)|opposition]])<ref name=AstDys/><ref name=Horizons/>
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'''Makemake''', [[Minor planet names|formally designated]] '''(136472)&nbsp;Makemake''', is the third-largest known [[dwarf planet]] in the [[Solar System]] and one of the two largest [[Kuiper belt]] objects (KBO) in the [[Classical Kuiper belt object|classical KBO]] population.{{Ref_label|B|b|none}} Its diameter is roughly three-quarters that of [[Pluto]].<ref>{{cite web|title=The discovery of {{mp|2003 UB|313}} Eris, the 10<sup>th</sup> planet largest known dwarf planet|author=Michael E. Brown|work=California Institute of Technology|year=2006|url= http://web.gps.caltech.edu/~mbrown/planetlila/|accessdate=2008-07-14}}</ref> Makemake has no known satellites, which makes it unique among the largest KBOs. Its extremely low average temperature, about {{convert|30|K|C|lk=in}}, means its surface is covered with [[methane]], [[ethane]], and possibly [[nitrogen]] ices.<ref name=brown/>
'''iggle piggle''', [[Minor planet names|formally designated]] '''(136472)&nbsp;iggle piggle''', is the third-largest known [[dwarf planet]] in the [[Solar System]] and one of the two largest [[Kuiper belt]] objects (KBO) in the [[Classical Kuiper belt object|classical KBO]] population.{{Ref_label|B|b|none}} Its diameter is roughly three-quarters that of [[Pluto]].<ref>{{cite web|title=The discovery of {{mp|2003 UB|313}} Eris, the 10<sup>th</sup> planet largest known dwarf planet|author=Michael E. Brown|work=California Institute of Technology|year=2006|url= http://web.gps.caltech.edu/~mbrown/planetlila/|accessdate=2008-07-14}}</ref> Makemake has no known satellites, which makes it unique among the largest KBOs. Its extremely low average temperature, about {{convert|30|K|C|lk=in}}, means its surface is covered with [[methane]], [[ethane]], and possibly [[nitrogen]] ices.<ref name=brown/>


Initially known as '''{{mp|2005 FY|9}}''' and later given the [[minor planet names|minor planet number]] 136472, it was discovered on March 31, 2005, by a team led by [[Michael E. Brown|Michael Brown]], and announced on July 29, 2005. Its name derives from the [[Rapanui]] god [[Makemake (mythology)|Makemake]]. On June 11, 2008, the [[International Astronomical Union]] (IAU) included Makemake in its list of potential candidates to be given "[[plutoid]]" status, a term for dwarf planets beyond the orbit of [[Neptune]] that would place the object alongside [[Pluto]], [[Haumea (dwarf planet)|Haumea]] and {{dp|Eris}}. Makemake was formally classified as a plutoid in July 2008.<ref name=Brown>{{cite web|author=Michael E. Brown|title=The Dwarf Planets|publisher=California Institute of Technology, Department of Geological Sciences|url=http://web.gps.caltech.edu/~mbrown/dwarfplanets/|accessdate=2008-01-26}}</ref><ref name=name/><ref name="Tancredi">{{cite journal|author=Gonzalo Tancredi, Sofia Favre|title=Which are the dwarfs in the Solar System?|year=2008|month=June|journal=Icarus|volume=195|issue=2|pages=851–862|url=http://www.lpi.usra.edu/meetings/acm2008/pdf/8261.pdf|format=PDF|doi=10.1016/j.icarus.2007.12.020|accessdate=2008-08-03}}</ref><ref name=IAU0806>{{cite press release| publisher = International Astronomical Union (News Release - IAU0806)|title= Fourth dwarf planet named Makemake|author=International Astronomical Union|url=http://www.iau.org/public_press/news/release/iau0806/|date=2008-07-19|accessdate=2008-07-20}}</ref>
Initially known as '''{{mp|2005 FY|9}}''' and later given the [[minor planet names|minor planet number]] 136472, it was discovered on March 31, 2005, by a team led by [[Michael E. Brown|Michael Brown]], and announced on July 29, 2005. Its name derives from the [[Rapanui]] god [[Makemake (mythology)|Makemake]]. On June 11, 2008, the [[International Astronomical Union]] (IAU) included Makemake in its list of potential candidates to be given "[[plutoid]]" status, a term for dwarf planets beyond the orbit of [[Neptune]] that would place the object alongside [[Pluto]], [[Haumea (dwarf planet)|Haumea]] and {{dp|Eris}}. Makemake was formally classified as a plutoid in July 2008.<ref name=Brown>{{cite web|author=Michael E. Brown|title=The Dwarf Planets|publisher=California Institute of Technology, Department of Geological Sciences|url=http://web.gps.caltech.edu/~mbrown/dwarfplanets/|accessdate=2008-01-26}}</ref><ref name=name/><ref name="Tancredi">{{cite journal|author=Gonzalo Tancredi, Sofia Favre|title=Which are the dwarfs in the Solar System?|year=2008|month=June|journal=Icarus|volume=195|issue=2|pages=851–862|url=http://www.lpi.usra.edu/meetings/acm2008/pdf/8261.pdf|format=PDF|doi=10.1016/j.icarus.2007.12.020|accessdate=2008-08-03}}</ref><ref name=IAU0806>{{cite press release| publisher = International Astronomical Union (News Release - IAU0806)|title= Fourth dwarf planet named Makemake|author=International Astronomical Union|url=http://www.iau.org/public_press/news/release/iau0806/|date=2008-07-19|accessdate=2008-07-20}}</ref>

Revision as of 23:35, 17 June 2010

Makemake
Makemake as seen by the Hubble Space Telescope
Discovery
Discovered byMichael E. Brown,
Chad Trujillo,
David Rabinowitz
Discovery dateMarch 31, 2005
Designations
Designation
(136472) Makemake
Pronunciation/ˌmɑːkiːˈmɑːkiː/ or /ˌmɑːkeɪˈmɑːkeɪ/[a]
2005 FY9
dwarf planet, plutoid, TNO (cubewano)[1]
AdjectivesMakemakean
Orbital characteristics[2][3]
Epoch January 28, 1955 (JD 2 435 135.5)
Aphelion7,939.7 Gm (53.074 AU)
Perihelion5,760.8 Gm (38.509 AU)
6,850.3 Gm (45.791 AU)
Eccentricity0.159
113,183 d (309.88 a)
4.419 km/s
85.13°
Inclination28.96°
79.382°
298.41°
Physical characteristics
Dimensions1,300–1,900 km
Mean radius
750+200
−100 km[4]
~7,000,000 km²
Volume~1.8 km³
Mass~4 kg
Mean density
~2 g/cm³ (assumed)
~0.47 m/s²
~0.84 km/s
7.771±0.003 hours[5]
unknown
Albedo78.2+10.3
−8.6 (geometric)[4]
Temperature30–35 K [d](assuming the same albedo)
Spectral type
B-V=0.83, V-R=0.5[6]
16.7 (opposition)[7][8]
-0.45[3]

iggle piggle, formally designated (136472) iggle piggle, is the third-largest known dwarf planet in the Solar System and one of the two largest Kuiper belt objects (KBO) in the classical KBO population.[b] Its diameter is roughly three-quarters that of Pluto.[9] Makemake has no known satellites, which makes it unique among the largest KBOs. Its extremely low average temperature, about 30 K (−243.2 °C), means its surface is covered with methane, ethane, and possibly nitrogen ices.[10]

Initially known as 2005 FY9 and later given the minor planet number 136472, it was discovered on March 31, 2005, by a team led by Michael Brown, and announced on July 29, 2005. Its name derives from the Rapanui god Makemake. On June 11, 2008, the International Astronomical Union (IAU) included Makemake in its list of potential candidates to be given "plutoid" status, a term for dwarf planets beyond the orbit of Neptune that would place the object alongside Pluto, Haumea and Eris. Makemake was formally classified as a plutoid in July 2008.[11][12][13][14]

Discovery

Makemake was discovered on March 31, 2005, by a team at the Palomar Observatory, led by Michael Brown,[3] and was announced to the public on July 29, 2005. The discovery of Eris was made public the same day, following the announcement of Haumea two days earlier.[15]

Despite its relative brightness (it is about a fifth as bright as Pluto),[c] Makemake was not discovered until well after many much fainter Kuiper belt objects. Most searches for minor planets are conducted relatively close to the ecliptic (the region of the sky that the Sun, Moon and planets appear to lie in, as seen from Earth), due to the greater likelihood of finding objects there. It probably escaped detection during the earlier surveys due to its relatively high orbital inclination, and the fact that it was at its farthest distance from the ecliptic at the time of its discovery, in the northern constellation of Coma Berenices.[8]

Besides Pluto, Makemake is the only other dwarf planet that was bright enough for Clyde Tombaugh to have possibly detected during his search for trans-Neptunian planets around 1930.[16] At the time of Tombaugh's survey, Makemake was only a few degrees from the ecliptic, near the border of Taurus and Auriga,[e] at an apparent magnitude of 16.0.[8] This position, however, was also very near the Milky Way, and Makemake would have been almost impossible to find against the dense background of stars. Tombaugh continued searching for some years after the discovery of Pluto,[17] but he failed to find Makemake or any other trans-Neptunian objects.

Name

The provisional designation 2005 FY9 was given to Makemake when the discovery was made public. Before that, the discovery team used the codename "Easterbunny" for the object, because of its discovery shortly after Easter.[18]

In July 2008, in accordance with IAU rules for classical Kuiper belt objects, 2005 FY9 was given the name of a creator deity. The name of Makemake, the creator of humanity and god of fertility in the mythos of the Rapanui, the native people of Easter Island,[12] was chosen in part to preserve the object's connection with Easter.[18]

Orbit and classification

Orbits of Makemake (blue), Haumea (green), contrasted with the orbit of Pluto (red) and the ecliptic (grey). The perihelia (q)[3] and the aphelia (Q) are marked with the dates of passage. The positions on April 2006 are marked with the spheres illustrating relative sizes and differences in albedo and colour.

As of 2009, Makemake is at a distance of 52 astronomical units (7.78×109 km) from the Sun;[7][8] almost as far from the Sun as it ever reaches on its orbit.[10] Makemake follows an orbit very similar to that of Haumea: highly inclined at 29° and a moderate eccentricity of about 0.16.[19] Nevertheless, Makemake's orbit is slightly farther from the Sun in terms of both the semi-major axis and perihelion. Its orbital period is nearly 310 years,[2] more than Pluto's 248 years and Haumea's 283 years. Both Makemake and Haumea are currently far from the ecliptic—the angular distance is almost 29°. Makemake is approaching its 2033 aphelion,[8] while Haumea passed its aphelion in early 1992.[20]

Makemake is classified a classical Kuiper belt object,[1][b] which means its orbit lies far enough from Neptune to remain stable over the age of the Solar System.[21][22] Unlike plutinos, which can cross Neptune's orbit due to their 2:3 resonance with the planet, the classical objects have perihelia further from the Sun, free from Neptune's perturbation.[21] Such objects have relatively low eccentricities (e below 0.2) and orbit the Sun in much the same way the planets do. Makemake, however, is a member of the "dynamically hot" class of classical KBOs, meaning that it has a high inclination compared to others in its population.[23] Makemake is near (likely coincidental) the 11:6 resonance with Neptune.[24]

Physical characteristics

Brightness, size, and rotation

Makemake (apmag 16.9)

Makemake is currently visually the second brightest Kuiper belt object after Pluto,[16] having a March opposition apparent magnitude of 16.7[7] in the constellation Coma Berenices.[8] This is bright enough to be visible using a high-end amateur telescope. Makemake's high albedo of roughly 80 percent suggests an average surface temperature of about 30 K.[d][4] The size of Makemake is not precisely known, but the detection in infrared by the Spitzer space telescope, combined with the similarities of spectrum with Pluto yielded an estimate of a 1,500+400
−200 km diameter.[4] This is slightly larger than the size of Haumea, making Makemake possibly the third largest known Trans-Neptunian object after Eris and Pluto.[19] Makemake is now designated the fourth dwarf planet in the Solar System because it has a bright V-band absolute magnitude of −0.45.[3] This practically guarantees that it is large enough to achieve hydrostatic equilibrium and become an oblate spheroid.[12]

EarthMoonCharonCharonNixNixKerberosKerberosStyxStyxHydraHydraPlutoPlutoDysnomiaDysnomiaErisErisNamakaNamakaHi'iakaHi'iakaHaumeaHaumeaMakemakeMakemakeMK2MK2XiangliuXiangliuGonggongGonggongWeywotWeywotQuaoarQuaoarSednaSednaVanthVanthOrcusOrcusActaeaActaeaSalaciaSalacia2002 MS42002 MS4File:10 Largest Trans-Neptunian objects (TNOS).png
Artistic comparison of Pluto, Eris, Makemake, Haumea, Gonggong (2007 OR10), Sedna, Quaoar, Orcus, 2002 MS4, and Salacia.

Spectra

In a letter written to the journal Astronomy and Astrophysics in 2006, Licandro et al. reported the measurements of the visible and near infrared spectrum of Makemake. They used the William Herschel Telescope and Telescopio Nazionale Galileo and showed that the surface of Makemake resembles that of Pluto.[25] Like Pluto, Makemake appears red in the visible spectrum, but significantly less red than the surface of Eris (see colour comparison of TNOs).[25] The near-infrared spectrum is marked by the presence of the broad methane (CH4) absorption bands. The methane is observed also on Pluto and Eris, but its spectral signature is much weaker.[25]

Spectral analysis of Makemake's surface revealed that methane must be present in the form of large grains at least one centimetre in size.[10] In addition large amounts of ethane and tholins may be present as well, most likely created by photolysis of methane by solar radiation.[10] The tholins are probably responsible for the red color of the visible spectrum. Although evidence exists for the presence of nitrogen ice on its surface, at least mixed with other ices, there is nowhere near the same level of nitrogen as on Pluto and Triton, where it composes more than 98 percent of the crust. The relative lack of nitrogen ice suggests that its supply of nitrogen has somehow been depleted over the age of the Solar System.[10][26][27]

Atmosphere

The presence of methane and possibly nitrogen suggests that Makemake could have a transient atmosphere similar to that of Pluto near its perihelion.[25] Nitrogen, if present, will be the dominant component of it.[10] The existence of an atmosphere also provides a natural explanation for the nitrogen depletion: since the gravity of Makemake is weaker than that of Pluto, Eris and Triton, a large amount of nitrogen was probably lost via atmospheric escape; methane is lighter than nitrogen, but has significantly lower vapor pressure at temperatures prevalent at the surface of Makemake (30–35 K),[d] which hinders its escape; the result of this process is a higher relative abundance of methane.[28]

Satellites

No satellites have been detected around Makemake so far. A satellite having a brightness 1% of that of the primary would have been detected if it had been at the distance 0.4 arcseconds or further from Makemake.[16] This contrasts with the other largest trans-Neptunian objects, which all possess at least one satellite: Eris has one, Haumea has two and Pluto has three. From 10% to 20% of all trans-Neptunian objects are expected to have one or more satellites.[16] Since satellites offer a simple method to measure an object's mass, lack of a satellite makes obtaining an accurate figure for Makemake's mass more difficult.[16]

See also

Template:Wikipedia-Books

Notes

  1. ^ ^ The Rapa Nui pronunciation is [ˌmakeˈmake], which is approximated in English as either /ˌmɑːkiːˈmɑːkiː/ (Template:USdict)[18] or /ˌmɑːkeɪˈmɑːkeɪ/ (Template:USdict).[29][30] The first is the fully anglicized pronunciation (at least in the US; in the UK it is /ˈmækiːˈmækiː/ (Template:USdict)); the second is a more Polynesian pronunciation, used by Brown and his students.[31]
  2. ^ Astronomers Mike Brown, David Jewitt and Marc Buie classify Makemake as a near scattered object but the Minor Planet Center, from which Wikipedia draws most of its definitions for the trans-Neptunian population, places it among the main Kuiper belt population.[2][10][32].[33]
  3. ^ It has an apparent magnitude in opposition of 16.7 vs. 15 for Pluto.[34]
  4. ^ Based on Minor Planet Center online Minor Planet Ephemeris Service: March 1, 1930: RA: 05h51m, Dec: +29.0.

References

  1. ^ a b "MPEC 2009-P26 : DISTANT MINOR PLANETS (2009 AUG. 17.0 TT)". IAU Minor Planet Center. 2009-08-07. Retrieved 2009-08-28.
  2. ^ a b c Marc W. Buie (2008-04-05). "Orbit Fit and Astrometric record for 136472". SwRI (Space Science Department). Retrieved 2008-07-13.
  3. ^ a b c d e "JPL Small-Body Database Browser: 136472 (2005 FY9)". NASA Jet Propulsion Laboratory. 2010-01-26 last obs. Retrieved 2008-06-11. {{cite web}}: Check date values in: |date= (help)
  4. ^ a b c d J. Stansberry, W. Grundy, M. Brown; et al. (2007). "Physical Properties of Kuiper Belt and Centaur Objects: Constraints from Spitzer Space Telescope" (abstract). The Solar System beyond Neptune. University of Arizona Press. Retrieved 2008-08-04. {{cite journal}}: Explicit use of et al. in: |author= (help); Unknown parameter |month= ignored (help)CS1 maint: multiple names: authors list (link)
  5. ^ A. N. Heinze and Daniel deLahunta, The rotation period and light-curve amplitude of Kuiper belt dwarf planet 136472 Makemake (2005 FY9), The Astronomical Journal 138 (2009), pp. 428-438. doi: 10.1088/0004-6256/138/2/428
  6. ^ Snodgrass, Carry, Dumas, Hainaut (2009). "Characterisation of candidate members of (136108) Haumea's family". The Astrophysical Journal. arXiv:0912.3171. {{cite journal}}: |format= requires |url= (help); Unknown parameter |day= ignored (help); Unknown parameter |month= ignored (help)CS1 maint: multiple names: authors list (link)
  7. ^ a b c "AstDys (136472) Makemake Ephemerides". Department of Mathematics, University of Pisa, Italy. Retrieved 2009-03-19.
  8. ^ a b c d e f "Asteroid 136472 Makemake (2005 FY9)". HORIZONS Web-Interface. JPL Solar System Dynamics. Retrieved 2008-07-01.
  9. ^ Michael E. Brown (2006). "The discovery of 2003 UB313 Eris, the 10th planet largest known dwarf planet". California Institute of Technology. Retrieved 2008-07-14.
  10. ^ a b c d e f g Mike Brown, K. M. Barksume, G. L. Blake, E. L. Schaller, D. L. Rabinowitz, H. G. Roe and C. A. Trujillo (2007). "Methane and Ethane on the Bright Kuiper Belt Object 2005 FY9". The Astronomical Journal. 133: 284–289. doi:10.1086/509734.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  11. ^ Michael E. Brown. "The Dwarf Planets". California Institute of Technology, Department of Geological Sciences. Retrieved 2008-01-26.
  12. ^ a b c "Dwarf Planets and their Systems". Working Group for Planetary System Nomenclature (WGPSN). U.S. Geological Survey. 2008-11-07. Retrieved 2008-07-13.
  13. ^ Gonzalo Tancredi, Sofia Favre (2008). "Which are the dwarfs in the Solar System?" (PDF). Icarus. 195 (2): 851–862. doi:10.1016/j.icarus.2007.12.020. Retrieved 2008-08-03. {{cite journal}}: Unknown parameter |month= ignored (help)
  14. ^ International Astronomical Union (2008-07-19). "Fourth dwarf planet named Makemake" (Press release). International Astronomical Union (News Release - IAU0806). Retrieved 2008-07-20.
  15. ^ Thomas H. Maugh II and John Johnson Jr. (2005). "His Stellar Discovery Is Eclipsed". Los Angeles Times. Retrieved 2008-07-14.
  16. ^ a b c d e M. E. Brown, M. A. van Dam, A. H. Bouchez; et al. (2006-03-01). "Satellites of the Largest Kuiper Belt Objects". The Astrophysical Journal. 639: L43–L46. doi:10.1086/501524. {{cite journal}}: Explicit use of et al. in: |author= (help)CS1 maint: multiple names: authors list (link)
  17. ^ "Clyde W. Tombaugh". New Mexico Museum of Space History. Retrieved 2008-06-29.
  18. ^ a b c Mike Brown (2008). "Mike Brown's Planets: What's in a name? (part 2)". California Institute of Technology. Retrieved 2008-07-14.
  19. ^ a b S. C. Tegler, W. M. Grundy, W. Romanishin, G. J. Consolmagno, K. Mogren, F. Vilas (2007-01-08). "Optical Spectroscopy of the Large Kuiper Belt Objects 136472 (2005 FY9) and 136108 (2003 EL61)". The Astronomical Journal. 133: 526–530. doi:10.1086/510134.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  20. ^ "Asteroid 136108 (2003 EL61)". HORIZONS Web-Interface. JPL Solar System Dynamics. Retrieved 2008-08-04.
  21. ^ a b David Jewitt (2000). "Classical Kuiper Belt Objects (CKBOs)". University of Hawaii. Archived from the original on August 05, 2008. Retrieved 2008-08-04. {{cite web}}: Check date values in: |archivedate= (help); Unknown parameter |month= ignored (help)
  22. ^ Jane X. Luu and David C. Jewitt (2002). "Kuiper Belt Objects: Relics from the Accretion Disk of the Sun" (pdf). Ann. Rev. Astron. Astrophys. 40: 63–101. doi:10.1146/annurev.astro.40.060401.093818. Retrieved 2008-08-04.
  23. ^ Harold F. Levison, Alessandro Morbidelli (2003). "The formation of the Kuiper belt by the outward transport of bodies during Neptune's migration" (pdf). Nature. 426 (6965): 419–421. doi:10.1038/nature02120. PMID 14647375. Retrieved 2007-06-25.
  24. ^ Preliminary simulation of Makemake (2005 FY9)'s orbit and the 2009-02-04 nominal (non-librating) rotating frame for Makemake. See (182294) 2001 KU76 for a proper 11:6 resonance libration.
  25. ^ a b c d J. Licandro, N. Pinilla-Alonso, M. Pedani, E. Oliva, G. P. Tozzi, W. M. Grundy (2006). "The methane ice rich surface of large TNO 2005 FY9: a Pluto-twin in the trans-neptunian belt?". Astronomy and Astrophysics. 445 (3): L35–L38. doi:10.1051/0004-6361:200500219.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  26. ^ S.C. Tegler, W.M. Grundy, F. Vilas, W. Romanishin, D.M. Cornelison and G.J. Consolmagno (2008). "Evidence of N2-ice on the surface of the icy dwarf Planet 136472 (2005 FY9)". Icarus. 195 (2): 844–850. doi:10.1016/j.icarus.2007.12.015. {{cite journal}}: Unknown parameter |month= ignored (help)CS1 maint: multiple names: authors list (link)
  27. ^ Tobias C. Owen, Ted L. Roush; et al. (1993-08-06). "Surface Ices and the Atmospheric Composition of Pluto". Science. 261 (5122): 745–748. doi:10.1126/science.261.5122.745. PMID 17757212. Retrieved 2008-08-03. {{cite journal}}: Explicit use of et al. in: |author= (help)
  28. ^ E.L. Schaller, M.E. Brown (2007-04-10). "Volatile Loss and Retention on Kuiper Belt Objects". The Astrophysical Journal. 659: L61–L64. doi:10.1086/516709.
  29. ^ Mike Brown (2008). "Mike Brown's Planets: Make-make". California Institute of Technology. Retrieved 2008-07-14.
  30. ^ Robert D. Craig (2004). Handbook of Polynesian Mythology. ABC-CLIO. p. 63.
  31. ^ Podcast Dwarf Planet Haumea (Darin Ragozzine, at 3′11″)
  32. ^ Audrey Delsanti, David Jewitt. "The Solar System Beyond The Planets" (PDF). University of Hawaii. Retrieved 2008-08-03.
  33. ^ "List Of Transneptunian Objects". Minor Planet Center. Harvard-Smithsonian Center for Astrophysics. Retrieved 2008-08-03.
  34. ^ David L. Rabinowitz, Bradley E. Schaefer, Suzanne W. Tourtellotte (2007). "The Diverse Solar Phase Curves of Distant Icy Bodies. I. Photometric Observations of 18 Trans-Neptunian Objects, 7 Centaurs, and Nereid". The Astronomical Journal. 133: 26–43. doi:10.1086/508931. Retrieved 2008-08-03.{{cite journal}}: CS1 maint: multiple names: authors list (link)

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