Difference between revisions of "Oberon"
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ITSAMEMARIO (talk | contribs) (New page: Oberon is the farthest moon outside of uranus with a 760 Km ratio. It is the second largest moon in orbit of the planet. == Name == Oberon, like the other moons of the same planet, ha...) |
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| − | Oberon is the | + | {{Planet |
| + | |image=Oberon.jpg | ||
| + | |caption=Oberon, taken by Voyager 2 | ||
| + | |date=January 11, 1787<ref name=usgs>"[http://planetarynames.wr.usgs.gov/append7.html Gazetteer of Planetary Nomenclature: Planetary Body Names and Discoverers]." US Geological Survey, Jennifer Blue, ed. March 31, 2008. Accessed April 17, 2008.</ref> | ||
| + | |discname=William Herschel<ref name=usgs/><ref name=Hamilton>Hamilton, Calvin J. "[http://www.solarviews.com/eng/oberon.htm Entry for Oberon]." ''Views of the Solar System'', 2001. Accessed June 16, 2008.</ref> | ||
| + | |origname=King of the fairies in the play ''A Midsummer Night's Dream'' by William Shakespeare<ref name=Hamilton/><ref name=Arnett>Arnett, Bill. "[http://www.nineplanets.org/oberon.html Entry for Oberon]." ''The <s>Nine</s> 8 Planets'', December 22, 2004. Accessed June 16, 2008.</ref> | ||
| + | |primary=Uranus | ||
| + | |order=18 | ||
| + | |periapsis=583,053 km<ref name=calc>Calculated</ref> | ||
| + | |apoapsis=583,987 km<ref name=calc/> | ||
| + | |semimajor=583,520 km<ref name=uranussatfact>Williams, David R. "[http://nssdc.gsfc.nasa.gov/planetary/factsheet/uraniansatfact.html Uranian Satellite Fact Sheet]." National Space Science Data Center, [[National Aeronautics and Space Administration|NASA]], November 23, 2007. Accessed June 16, 2008.</ref> | ||
| + | |eccentricity=0.0008<ref name=uranussatfact/> | ||
| + | |sidereal=13.463239 da<ref name=uranussatfact/> | ||
| + | |orbitspeed=3.15 km/s<ref name=Hamilton/> | ||
| + | |inclination=0.10°<ref name=uranussatfact/> | ||
| + | |siderealday=13.463239 da<ref name=uranussatfact/> | ||
| + | |rotatespeed=0.00411 km/s<ref name=calc/> | ||
| + | |axialtilt=0°<ref name=uranussatfact/> | ||
| + | |mass=3.01 * 10<sup>21</sup> kg<ref name=uranussatfact/> | ||
| + | |density=1630 kg/m³<ref name=uranussatfact/> | ||
| + | |meanradius=761.4 km<ref name=uranussatfact/> | ||
| + | |surfacegrav=0.3469 m/s²<ref name=calc/> | ||
| + | |escapespeed=0.7268 km/s<ref name=calc/> | ||
| + | |surfacearea=7,285,102 km²<ref name=calc/> | ||
| + | |meantemp=61 K | ||
| + | |composition=Water ice and rock<ref name=Arnett/> | ||
| + | |color=Light brown-gray | ||
| + | |albedo=0.25<ref name=uranussatfact/> | ||
| + | }}'''Oberon''' or '''Uranus IV''' is the eighteenth [[moon]] of [[Uranus]], and the outermost of the major moons of Uranus. It is also the second largest moon of Uranus.<ref name=Arnett/><ref name=Britannica>Ingersoll, Andrew P. "[https://www.britannica.com/eb/article-9056637 Oberon]." Encyclopædia Britannica. 2008. Encyclopædia Britannica Online. 16 June 2008.</ref> | ||
| − | == | + | == Discovery and naming == |
| − | + | [[William Herschel]] discovered Oberon and its inner companion, [[Titania]], on January 11, 1787.<ref name=usgs/> | |
| − | |||
| − | == | + | Sir [[John Herschel]], his son, named the planet after the king of the fairies in [[William Shakespeare]]'s comedy, ''[[A Midsummer Night's Dream]]''.<ref name=usgs/><ref name=Lassell3>Lassell, William. "[http://articles.adsabs.harvard.edu//full/1852AN.....34..325./0000169.000.html Beobachtungen der Uranus-Satelliten]." ''Astronomische Nachrichten'' 34:325-328, 1852. Accessed June 16, 2008.</ref> |
| − | The | + | == Orbital characteristics == |
| + | Oberon is in a slightly eccentric orbit around Uranus, at an average distance of 583,520 km. Its sidereal month is about 13.46 [[Earth]] days.<ref name=uranussatfact/><ref name=Britannica/> | ||
| + | |||
| + | == Rotational characteristics == | ||
| + | Oberon is in [[tidal lock]] with Uranus.<ref name=uranussatfact/><ref name=Britannica/> | ||
| + | |||
| + | == Physical characteristics == | ||
| + | Oberon is the second largest of the moons of Uranus. It is probably composed of [[water]] ice and rock.<ref name=Arnett/><ref name=Britannica/> | ||
| + | |||
| + | === Surface === | ||
| + | The surface of Oberon has many impact craters. Many of these have bright rays that radiate from them, similar to those found on [[Callisto]].<ref name=Hamilton/><ref name=Arnett/><ref name=Britannica/> | ||
| + | |||
| + | The surface, including many of the crater floors, is partially covered with a dark material of unknown origin. Some astronomers speculate that this material is an aqueous solution that upwelled from the interior.<ref name=Hamilton/><ref name=Britannica/> | ||
| + | |||
| + | == Problems for uniformitarian theories posed by Oberon == | ||
| + | Oberon poses the same problem for [[uniformitarianism|uniformitarian]] astronomy as do all the other moons of Uranus: its orbit is inclined severely to the ecliptic, though not to Uranus' own equator. How the Uranian system came to have such an inclination has never been explained. | ||
| + | |||
| + | == Observation and Exploration == | ||
| + | Oberon is visible on a dark sky through a telescope having an aperture of 30 cm or more.<ref name=Arnett/> | ||
| + | |||
| + | The only spacecraft to explore Oberon has been [[Voyager 2]]. It approached to within 470,600 km of Oberon on January 24, 1986, and took a small number of images.<ref name=Voyager1>"[http://pds-rings.seti.org/voyager/mission/#v2uenc Voyager Mission Description: Voyager 2 Uranus Encounter]." February 19, 1997. Accessed June 13, 2008.</ref><ref name=Smith>Smith, B.A., Soderblom, L.A., Beebe, R., ''et al.'' "[http://adsabs.harvard.edu/abs/1986Sci...233...43S Voyager 2 in the Uranian system - Imaging science results]." ''Science'' 233:43-64, July 4, 1986. Accessed June 13, 2008.</ref> No other detailed images are available. | ||
| + | |||
| + | == References == | ||
| + | {{reflist|2}} | ||
| + | {{Solarsystem}} | ||
Latest revision as of 18:52, September 26, 2018
| Oberon | |
|---|---|
 Oberon, taken by Voyager 2 | |
| Date of discovery | January 11, 1787[1] |
| Name of discoverer | William Herschel[1][2] |
| Name origin | King of the fairies in the play A Midsummer Night's Dream by William Shakespeare[2][3] |
| Orbital characteristics | |
| Primary | Uranus |
| Order from primary | 18 |
| Periuranion | 583,053 km[4] |
| Apuranion | 583,987 km[4] |
| Semi-major axis | 583,520 km[5] |
| Orbital eccentricity | 0.0008[5] |
| Sidereal month | 13.463239 da[5] |
| Avg. orbital speed | 3.15 km/s[2] |
| Inclination | 0.10°[5] to Uranus's equator |
| Rotational characteristics | |
| Sidereal day | 13.463239 da[5] |
| Rotational speed | 0.00411 km/s[4] |
| Axial tilt | 0°[5] |
| Physical characteristics | |
| Mass | 3.01 * 1021 kg[5] |
| Density | 1630 kg/m³[5] |
| Mean radius | 761.4 km[5] |
| Surface gravity | 0.3469 m/s²[4] |
| Escape speed | 0.7268 km/s[4] |
| Surface area | 7,285,102 km²[4] |
| Mean temperature | 61 K |
| Composition | Water ice and rock[3] |
| Color | Light brown-gray |
| Albedo | 0.25[5] |
Oberon or Uranus IV is the eighteenth moon of Uranus, and the outermost of the major moons of Uranus. It is also the second largest moon of Uranus.[3][6]
Discovery and naming
William Herschel discovered Oberon and its inner companion, Titania, on January 11, 1787.[1]
Sir John Herschel, his son, named the planet after the king of the fairies in William Shakespeare's comedy, A Midsummer Night's Dream.[1][7]
Orbital characteristics
Oberon is in a slightly eccentric orbit around Uranus, at an average distance of 583,520 km. Its sidereal month is about 13.46 Earth days.[5][6]
Rotational characteristics
Oberon is in tidal lock with Uranus.[5][6]
Physical characteristics
Oberon is the second largest of the moons of Uranus. It is probably composed of water ice and rock.[3][6]
Surface
The surface of Oberon has many impact craters. Many of these have bright rays that radiate from them, similar to those found on Callisto.[2][3][6]
The surface, including many of the crater floors, is partially covered with a dark material of unknown origin. Some astronomers speculate that this material is an aqueous solution that upwelled from the interior.[2][6]
Problems for uniformitarian theories posed by Oberon
Oberon poses the same problem for uniformitarian astronomy as do all the other moons of Uranus: its orbit is inclined severely to the ecliptic, though not to Uranus' own equator. How the Uranian system came to have such an inclination has never been explained.
Observation and Exploration
Oberon is visible on a dark sky through a telescope having an aperture of 30 cm or more.[3]
The only spacecraft to explore Oberon has been Voyager 2. It approached to within 470,600 km of Oberon on January 24, 1986, and took a small number of images.[8][9] No other detailed images are available.
References
- ↑ 1.0 1.1 1.2 1.3 "Gazetteer of Planetary Nomenclature: Planetary Body Names and Discoverers." US Geological Survey, Jennifer Blue, ed. March 31, 2008. Accessed April 17, 2008.
- ↑ 2.0 2.1 2.2 2.3 2.4 Hamilton, Calvin J. "Entry for Oberon." Views of the Solar System, 2001. Accessed June 16, 2008.
- ↑ 3.0 3.1 3.2 3.3 3.4 3.5 Arnett, Bill. "Entry for Oberon." The
Nine8 Planets, December 22, 2004. Accessed June 16, 2008. - ↑ 4.0 4.1 4.2 4.3 4.4 4.5 Calculated
- ↑ 5.00 5.01 5.02 5.03 5.04 5.05 5.06 5.07 5.08 5.09 5.10 5.11 Williams, David R. "Uranian Satellite Fact Sheet." National Space Science Data Center, NASA, November 23, 2007. Accessed June 16, 2008.
- ↑ 6.0 6.1 6.2 6.3 6.4 6.5 Ingersoll, Andrew P. "Oberon." Encyclopædia Britannica. 2008. Encyclopædia Britannica Online. 16 June 2008.
- ↑ Lassell, William. "Beobachtungen der Uranus-Satelliten." Astronomische Nachrichten 34:325-328, 1852. Accessed June 16, 2008.
- ↑ "Voyager Mission Description: Voyager 2 Uranus Encounter." February 19, 1997. Accessed June 13, 2008.
- ↑ Smith, B.A., Soderblom, L.A., Beebe, R., et al. "Voyager 2 in the Uranian system - Imaging science results." Science 233:43-64, July 4, 1986. Accessed June 13, 2008.
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