Oberó (satèl·lit): diferència entre les revisions
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{{Infobox planet
| name = Oberó
| image = [[File:Voyager 2 picture of Oberon.jpg|260px|Oberó vist per la nau Voyager 2 des de 660.000 km]]
| caption = Oberó vist per la nau Voyager 2 des de 660.000 km]{{refn | S'hi veuen una colla de [[cràter d'impacte|cràters]] brillants. ''Hamlet'', una mica per sota del centre, té material fosc al seu fons; cap a la esquerra superior hi ha Otel·lo, més petit. A la part esquerra inferior, sobresurt del límit una muntanya d'11 km d'alçada, probablement el pic central d'un altre cràter. Mommur Chasma es veu seguint el terminador a la part superior dreta.| group = caption}}
| discovery = yes
| discoverer = [[William Herschel]]
| discovered = 11 de gener de 1787<ref name="Herschel 1787" />
| semimajor = {{val|583520|u=km}}<ref name="orbit" />
| eccentricity = {{val|0.0014}}<ref name="orbit" />
| period = {{val|13.463234|u=[[Day|d]]}}<ref name="orbit" />
| avg_speed = 3,15 km/s (calculada)
| inclination = {{val|0.058|u=°}} (respecte l'equador d'Urà)<ref name="orbit" />
| satellite_of = [[Urà (planeta)|Urà]]
| physical_characteristics = yes
| mean_radius = {{val|761.4|2.6|u=km}} ({{val|0.1194|u=Terres}})<ref name="Thomas 1988" />
| surface_area = {{val|7285000|u=km²}}{{efn|name=surface area}}
| volume = {{val|1849000000|u=km³}}{{efn|name=volume}}
| mass = {{val|3.014|0.075|e=21|u=kg}} ({{val|5.046|e=-4|u=Terres}})<ref name="Jacobson Campbell et al. 1992" />
| density = {{val|1.63|0.05|u=g/cm³}}<ref name="Jacobson Campbell et al. 1992" />
| surface_grav = 0,346 [[Acceleració|m/s²]]{{efn|name=surface gravity}}
| escape_velocity = 0,727 km/s{{efn|name=escape velocity}}
| rotation = se suposa [[rotació síncrona|síncrona]]<ref name="Smith Soderblom et al. 1986" />
| albedo =
{{plainlist |
* 0.31 (geomètrica)
* 0.14 ([[albedo de Bond|Bond]])<ref name="Karkoschka 2001, Hubble" />
}}
| magnitude = 14,1<ref name="Newton Teece 1995" />
| single_temperature = 70–80 [[Kelvin|K]]<ref name="Grundy Young et al. 2006" />
| atmosphere = no
| surface_pressure = zero
| note = no
}}
'''Oberó''' és el més exterior dels satèl·lits majors del planeta [[Urà (planeta)|Urà]]. Va ser descobert per [[William Herschel]] el dia [[11 de gener]] de [[1787]]. També s'anomena '''Urà IV'''.
Linha 63 ⟶ 46:
== Exploració ==
La llunyania d'esta lluna ha impedit estudiar la seua superfície en detall. Tan sols la sonda [[Voyager 2]], pel gener de [[1986]], va poder aproximar-se prou com per a obtindre imatges de certa qualitat, com la de la part superior de la taula. Durant el vol de la Voyager, l'hemisferi sud d'Oberó estava encarat al Sol i només aquesta part va poder ser estudiada car l'altre hemisferi estava a les fosques.
==Notes==
{{reflist| group = caption}}
{{notes
| notes =
{{efn
| name = surface area
| Àrea de superfície calculada a partir del radi ''r'': <math>4\pi r^2</math>.
}}
{{efn
| name = volume
| Volum ''v'' calculat a partir del radi ''r'': <math>4\pi r^3/3</math>.
}}
{{efn
| name = surface gravity
| Gravetat a la superfície calculada a partir de la massa ''m'', la [[constant gravitacional]] ''G'' i el radi ''r'': <math>Gm/r^2</math>.
}}
{{efn
| name = escape velocity
| Velocitat d'escapament calculada a partir de la massa ''m'', la [[constant gravitacional]] ''G'' i el radi ''r'': {{math|{{radical|2''Gm''/''r''}}}}.
}}
}}
<references group="nota"/>
== Referències ==
{{reflist
| colwidth = 30em
| refs =
<ref name="Herschel 1787">
{{cite journal| doi = 10.1098/rstl.1787.0016| last = Herschel | first = W. S.| authorlink = William Herschel| title = An Account of the Discovery of Two Satellites Revolving Round the Georgian Planet| journal = Philosophical Transactions of the Royal Society of London| volume = 77| pages = 125–129| year = 1787| pmid = | pmc = | jstor = 106717| ref = harv}}
</ref>
<ref name="orbit">
{{cite web
| title = Planetary Satellite Mean Orbital Parameters
| publisher = Jet Propulsion Laboratory, California Institute of Technology
| url = http://ssd.jpl.nasa.gov/?sat_elem
}}
</ref>
<ref name="Thomas 1988">
{{cite journal|year=1988|doi=10.1016/0019-1035(88)90054-1|bibcode=1988Icar...73..427T|pages=427–441 |volume=73 | first=P. C.|last=Thomas|title=Radii, shapes, and topography of the satellites of Uranus from limb coordinates|journal=Icarus|issue=3}}
</ref>
<ref name="Jacobson Campbell et al. 1992">
{{cite journal| doi = 10.1086/116211| last1 = Jacobson| first1 = R. A.| last2 = Campbell| first2 = J. K.| last3 = Taylor| first3 = A. H.| last4 = Synnott| first4 = S. P.| date=June 1992 | title = The masses of Uranus and its major satellites from Voyager tracking data and earth-based Uranian satellite data| journal = The Astronomical Journal| volume = 103| issue = 6| pages = 2068–2078| bibcode = 1992AJ....103.2068J| ref = {{sfnRef|Jacobson Campbell et al.|1992}}}}
</ref>
<ref name="Smith Soderblom et al. 1986">
{{cite journal| doi = 10.1126/science.233.4759.43| last1 = Smith| first1 = B. A.| last2 = Soderblom| first2 = L. A.| last3 = Beebe| first3 = A.| last4 = Bliss| first4 = D.| last5 = Boyce| first5 = J. M.| last6 = Brahic| first6 = A.| last7 = Briggs| first7 = G. A.| last8 = Brown| first8 = R. H.| last9 = Collins| first9 = S. A.| date = 4 July 1986| title = Voyager 2 in the Uranian System: Imaging Science Results| journal = Science| volume = 233| issue = 4759| pages = 43–64| pmid = 17812889| bibcode = 1986Sci...233...43S| ref = {{sfnRef|Smith Soderblom et al.|1986}}}}
</ref>
<ref name="Karkoschka 2001, Hubble">
{{cite journal| doi = 10.1006/icar.2001.6596| last = Karkoschka| first = Erich| year = 2001| title = Comprehensive Photometry of the Rings and 16 Satellites of Uranus with the Hubble Space Telescope| journal = Icarus| volume = 151| issue = 1| pages = 51–68| bibcode = 2001Icar..151...51K| ref = {{sfnRef|Karkoschka, Hubble|2001}}}}
</ref>
<ref name="Newton Teece 1995">
{{cite book
| last1 = Newton
| first1 = Bill
| last2 = Teece
| first2 = Philip
| date = 1995
| title = The guide to amateur astronomy
| publisher = Cambridge University Press
| isbn = 978-0-521-44492-7
| page = 109
| url = http://books.google.com/?id=l2TNnHkdDpkC
}}
</ref>
<ref name="Grundy Young et al. 2006">
{{cite journal| doi = 10.1016/j.icarus.2006.04.016| last1 = Grundy| first1 = W. M.| last2 = Young| first2 = L. A.| last3 = Spencer| first3 = J. R.| last4 = Johnson| first4 = R. E.| last5 = Young| first5 = E. F.| last6 = Buie| first6 = M. W.| date=October 2006 | title = Distributions of H<sub>2</sub>O and CO<sub>2</sub> ices on Ariel, Umbriel, Titania, and Oberon from IRTF/SpeX observations| journal = Icarus| volume = 184| issue = 2| pages = 543–555| arxiv = 0704.1525| bibcode = 2006Icar..184..543G| ref = {{sfnRef|Grundy Young et al.|2006}}}}
</ref>
}}
{{Referències}}
{{commonscat}}
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