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<div class="dablink">is about the planet. For other uses, see <a rel="nofollow" href="/wiki/Uranus_%28disambiguation%29" title="Uranus (disambiguation)">Uranus (disambiguation)</a>.</div><br/><div class="metadata topicon" style="display: none; right: 55px;" id="protected-icon"><a rel="nofollow" href="/wiki/Wikipedia:Protection_policy#semi" title="This article is semi-protected."><img src="http://upload.wikimedia.org/wikipedia/commons/thumb/f/fa/Padlock-silver-medium.svg/20px-Padlock-silver-medium.svg.png" height="20" width="20" alt="This article is semi-protected."></a></div><br/><table class="infobox vcard" style="width: 20em; text-align: left; font-size: 90%;" cellspacing="2"><br/><caption><span class="fn org" style="font-size: 120%;"><b>Uranus</b></span> <a rel="nofollow" class="image" href="/wiki/File:Uranus_symbol.svg" title="Astronomical symbol of Uranus"><img src="http://upload.wikimedia.org/wikipedia/commons/thumb/f/f1/Uranus_symbol.svg/25px-Uranus_symbol.svg.png" height="25" width="25" alt="Astronomical symbol of Uranus"></a></caption><br/><tbody><tr><br/><td style="line-height: 1.2em; text-align: center;" colspan="2"><a rel="nofollow" class="image" href="/wiki/File:Uranus2.jpg" title="Uranus as seen by Voyager 2"><img src="http://upload.wikimedia.org/wikipedia/commons/thumb/3/3d/Uranus2.jpg/240px-Uranus2.jpg" height="240" width="240" alt="Uranus as seen by Voyager 2"></a><br/><div style="padding-top: 0.25em;"><small>Uranus, as seen by <a rel="nofollow" href="/wiki/Voyager_2" title="Voyager 2">Voyager 2</a></small></div><br/></td><br/></tr><br/><tr><br/><th style="padding-top: 0.75em; text-align: center;" colspan="2"><br/><div style="background: rgb(192, 255, 255) none repeat scroll 0% 0%; -moz-background-clip: border; -moz-background-origin: padding; -moz-background-inline-policy: continuous;">Discovery</div><br/></th><br/></tr><br/><tr><br/><th style="line-height: 1.1em;">Discovered by</th><br/><td style="line-height: 1.2em;"><a rel="nofollow" href="/wiki/William_Herschel" title="William Herschel">William Herschel</a></td><br/></tr><br/><tr><br/><th style="line-height: 1.1em;">Discovery date</th><br/><td style="line-height: 1.2em;">March 13, 1781</td><br/></tr><br/><tr><br/><th style="padding-top: 0.75em; text-align: center;" colspan="2"><br/><div style="background: rgb(192, 255, 255) none repeat scroll 0% 0%; -moz-background-clip: border; -moz-background-origin: padding; -moz-background-inline-policy: continuous;">Designations</div><br/></th><br/></tr><br/><tr><br/><th style="line-height: 1.1em;">Pronunciation</th><br/><td style="line-height: 1.2em;"><big><span style="white-space: nowrap;"><a rel="nofollow" href="http://upload.wikimedia.org/wikipedia/commons/9/98/Uranus.ogg" title="Listen"><img src="http://upload.wikimedia.org/wikipedia/en/thumb/3/3c/Speakerlink.svg/11px-Speakerlink.svg.png" height="11" width="11" alt="Listen"></a><sup><span class="IPA" style="padding: 0pt 0.1em; color: rgb(0, 0, 238); font-family: sans-serif; font-style: normal; font-variant: normal; font-weight: bold; font-size: 80%; line-height: normal; font-size-adjust: none; font-stretch: normal; -x-system-font: none;"><a rel="nofollow" href="/wiki/File:Uranus.ogg" title="File:Uranus.ogg">i</a></span></sup> <span class="IPA" title="Representation in the International Phonetic Alphabet (IPA)"><a rel="nofollow" href="/wiki/Wikipedia:IPA_for_English" title="Wikipedia:IPA for English">/</a></span><span class="IPA"><a rel="nofollow" href="/wiki/Wikipedia:IPA_for_English#Key" title="Wikipedia:IPA for English"><span style="border-bottom: 1px dotted;" title="primary stress">ˈ</span></a></span><span class="IPA"><a rel="nofollow" href="/wiki/Wikipedia:IPA_for_English#Key" title="Wikipedia:IPA for English"><span style="border-bottom: 1px dotted;" title="'ure' in 'cure'">jʊər</span></a></span><span class="IPA"><a rel="nofollow" href="/wiki/Wikipedia:IPA_for_English#Key" title="Wikipedia:IPA for English"><span style="border-bottom: 1px dotted;" title="'on' in 'button'">ən</span></a></span><span class="IPA"><a rel="nofollow" href="/wiki/Wikipedia:IPA_for_English#Key" title="Wikipedia:IPA for English"><span style="border-bottom: 1px dotted;" title="schwa 'a' in 'Rosa’s'">ə</span></a></span><span class="IPA"><a rel="nofollow" href="/wiki/Wikipedia:IPA_for_English#Key" title="Wikipedia:IPA for English"><span style="border-bottom: 1px dotted;" title="'s' in 'sigh'">s</span></a></span><span class="IPA" title="Representation in the International Phonetic Alphabet (IPA)"><a rel="nofollow" href="/wiki/Wikipedia:IPA_for_English" title="Wikipedia:IPA for English">/</a></span></span> or <span style="white-space: nowrap;"><a rel="nofollow" href="http://upload.wikimedia.org/wikipedia/commons/1/1c/En-us-Uranus.ogg" title="Listen"><img src="http://upload.wikimedia.org/wikipedia/en/thumb/3/3c/Speakerlink.svg/11px-Speakerlink.svg.png" height="11" width="11" alt="Listen"></a><sup><span class="IPA" style="padding: 0pt 0.1em; color: rgb(0, 0, 238); font-family: sans-serif; font-style: normal; font-variant: normal; font-weight: bold; font-size: 80%; line-height: normal; font-size-adjust: none; font-stretch: normal; -x-system-font: none;"><a rel="nofollow" href="/wiki/File:En-us-Uranus.ogg" title="File:En-us-Uranus.ogg">i</a></span></sup> <span class="IPA" title="Representation in the International Phonetic Alphabet (IPA)"><a rel="nofollow" href="/wiki/Wikipedia:IPA_for_English" title="Wikipedia:IPA for English">/</a></span><span class="IPA"><a rel="nofollow" href="/wiki/Wikipedia:IPA_for_English#Key" title="Wikipedia:IPA for English"><span style="border-bottom: 1px dotted;" title="'y' in 'yes'">j</span></a></span><span class="IPA"><a rel="nofollow" href="/wiki/Wikipedia:IPA_for_English#Key" title="Wikipedia:IPA for English"><span style="border-bottom: 1px dotted;" title="short 'oo' in 'foot'">ʊ</span></a></span><span class="IPA"><a rel="nofollow" href="/wiki/Wikipedia:IPA_for_English#Key" title="Wikipedia:IPA for English"><span style="border-bottom: 1px dotted;" title="primary stress">ˈ</span></a></span><span class="IPA"><a rel="nofollow" href="/wiki/Wikipedia:IPA_for_English#Key" title="Wikipedia:IPA for English"><span style="border-bottom: 1px dotted;" title="'r' in 'rye'">r</span></a></span><span class="IPA"><a rel="nofollow" href="/wiki/Wikipedia:IPA_for_English#Key" title="Wikipedia:IPA for English"><span style="border-bottom: 1px dotted;" title="long 'a' in 'bade'">eɪ</span></a></span><span class="IPA"><a rel="nofollow" href="/wiki/Wikipedia:IPA_for_English#Key" title="Wikipedia:IPA for English"><span style="border-bottom: 1px dotted;" title="'n' in 'nigh'">n</span></a></span><span class="IPA"><a rel="nofollow" href="/wiki/Wikipedia:IPA_for_English#Key" title="Wikipedia:IPA for English"><span style="border-bottom: 1px dotted;" title="schwa 'a' in 'Rosa’s'">ə</span></a></span><span class="IPA"><a rel="nofollow" href="/wiki/Wikipedia:IPA_for_English#Key" title="Wikipedia:IPA for English"><span style="border-bottom: 1px dotted;" title="'s' in 'sigh'">s</span></a></span><span class="IPA" title="Representation in the International Phonetic Alphabet (IPA)"><a rel="nofollow" href="/wiki/Wikipedia:IPA_for_English" title="Wikipedia:IPA for English">/</a></span></span><sup class="reference" id="cite_ref-OED_0-0"><a rel="nofollow" href="#cite_note-OED-0"><span>[</span>1<span>]</span></a></sup><sup class="reference" id="cite_ref-BBCOUP_1-0"><a rel="nofollow" href="#cite_note-BBCOUP-1"><span>[</span>2<span>]</span></a></sup></big></td><br/></tr><br/><tr><br/><th style="line-height: 1.1em;"><a rel="nofollow" class="mw-redirect" href="/wiki/Adjectivals_and_demonyms_for_astronomical_bodies" title="Adjectivals and demonyms for astronomical bodies">Adjective</a></th><br/><td style="line-height: 1.2em;">Uranian</td><br/></tr><br/><tr><br/><th style="text-align: center; padding-top: 0.75em;" colspan="2"><br/><div style="background: rgb(192, 255, 255) none repeat scroll 0% 0%; -moz-background-clip: border; -moz-background-origin: padding; -moz-background-inline-policy: continuous;"><a rel="nofollow" href="/wiki/Orbit" title="Orbit">Orbital characteristics</a><sup class="reference" id="cite_ref-horizons_2-0"><a rel="nofollow" href="#cite_note-horizons-2"><span>[</span>3<span>]</span></a></sup><sup class="reference" id="ref_Anone"><a rel="nofollow" href="#endnote_Anone">[a]</a></sup></div><br/></th><br/></tr><br/><tr><br/><td style="text-align: center;" colspan="2"><small><a rel="nofollow" href="/wiki/Epoch_%28astronomy%29" title="Epoch (astronomy)">Epoch</a> <a rel="nofollow" class="mw-redirect" href="/wiki/J2000" title="J2000">J2000</a></small></td><br/></tr><br/><tr><br/><th style="line-height: 1.1em;"><a rel="nofollow" href="/wiki/Apsis" title="Apsis">Aphelion</a></th><br/><td style="line-height: 1.2em;">3,004,419,704 <a rel="nofollow" class="mw-redirect" href="/wiki/Kilometer" title="Kilometer">km</a><br><br/>20.083 305 26 <a rel="nofollow" href="/wiki/Astronomical_unit" title="Astronomical unit">AU</a></td><br/></tr><br/><tr><br/><th style="line-height: 1.1em;"><a rel="nofollow" href="/wiki/Apsis" title="Apsis">Perihelion</a></th><br/><td style="line-height: 1.2em;">2,748,938,461 km<br><br/>18.375 518 63 AU</td><br/></tr><br/><tr><br/><th style="line-height: 1.1em;"><a rel="nofollow" href="/wiki/Semi-major_axis" title="Semi-major axis">Semi-major axis</a></th><br/><td style="line-height: 1.2em;">2,876,679,082 km<br><br/>19.229 411 95 AU</td><br/></tr><br/><tr><br/><th style="line-height: 1.1em;"><a rel="nofollow" href="/wiki/Orbital_eccentricity" title="Orbital eccentricity">Eccentricity</a></th><br/><td style="line-height: 1.2em;">0.044 405 586</td><br/></tr><br/><tr><br/><th style="line-height: 1.1em;"><a rel="nofollow" href="/wiki/Orbital_period" title="Orbital period">Orbital period</a></th><br/><td style="line-height: 1.2em;">30,799.095 <a rel="nofollow" href="/wiki/Day" title="Day">days</a><br><br/>84.323 326 <a rel="nofollow" href="/wiki/Julian_year_%28astronomy%29" title="Julian year (astronomy)">yr</a><br><br/>42,718 Uranus <a rel="nofollow" class="mw-redirect" href="/wiki/Solar_day" title="Solar day">solar days</a><sup class="reference" id="cite_ref-planet_years_3-0"><a rel="nofollow" href="#cite_note-planet_years-3"><span>[</span>4<span>]</span></a></sup></td><br/></tr><br/><tr><br/><th style="line-height: 1.1em;"><a rel="nofollow" href="/wiki/Orbital_period" title="Orbital period">Synodic period</a></th><br/><td style="line-height: 1.2em;">369.66 days<sup class="reference" id="cite_ref-fact_4-0"><a rel="nofollow" href="#cite_note-fact-4"><span>[</span>5<span>]</span></a></sup></td><br/></tr><br/><tr><br/><th style="line-height: 1.1em;"><a rel="nofollow" href="/wiki/Orbital_speed" title="Orbital speed">Average orbital speed</a></th><br/><td style="line-height: 1.2em; vertical-align: middle;">6.81 km/s<sup class="reference" id="cite_ref-fact_4-1"><a rel="nofollow" href="#cite_note-fact-4"><span>[</span>5<span>]</span></a></sup></td><br/></tr><br/><tr><br/><th style="line-height: 1.1em;"><a rel="nofollow" href="/wiki/Mean_anomaly" title="Mean anomaly">Mean anomaly</a></th><br/><td style="line-height: 1.2em;">142.955 717°</td><br/></tr><br/><tr><br/><th style="line-height: 1.1em;"><a rel="nofollow" href="/wiki/Inclination" title="Inclination">Inclination</a></th><br/><td style="line-height: 1.2em;">0.772 556° to <a rel="nofollow" href="/wiki/Ecliptic" title="Ecliptic">Ecliptic</a><br><br/>6.48° to <a rel="nofollow" href="/wiki/Sun" title="Sun">Sun</a>'s equator<br><br/>1.02° to <a rel="nofollow" href="/wiki/Invariable_plane" title="Invariable plane">Invariable plane</a><sup class="reference" id="cite_ref-meanplane_5-0"><a rel="nofollow" href="#cite_note-meanplane-5"><span>[</span>6<span>]</span></a></sup></td><br/></tr><br/><tr><br/><th style="line-height: 1.1em;"><a rel="nofollow" href="/wiki/Longitude_of_the_ascending_node" title="Longitude of the ascending node">Longitude of ascending node</a></th><br/><td style="line-height: 1.2em; vertical-align: middle;">73.989 821°</td><br/></tr><br/><tr><br/><th style="line-height: 1.1em;"><a rel="nofollow" href="/wiki/Argument_of_periapsis" title="Argument of periapsis">Argument of perihelion</a></th><br/><td style="line-height: 1.2em; vertical-align: middle;">96.541 318°</td><br/></tr><br/><tr><br/><th style="line-height: 1.1em;"><a rel="nofollow" href="/wiki/Natural_satellite" title="Natural satellite">Satellites</a></th><br/><td style="line-height: 1.2em;"><a rel="nofollow" class="mw-redirect" href="/wiki/Uranus%27_natural_satellites" title="Uranus' natural satellites">27</a></td><br/></tr><br/><tr><br/><th style="text-align: center; padding-top: 0.75em;" colspan="2"><br/><div style="background: rgb(192, 255, 255) none repeat scroll 0% 0%; -moz-background-clip: border; -moz-background-origin: padding; -moz-background-inline-policy: continuous;">Physical characteristics</div><br/></th><br/></tr><br/><tr><br/><th style="line-height: 1.1em;"><a rel="nofollow" href="/wiki/Equator" title="Equator">Equatorial</a> radius</th><br/><td style="line-height: 1.2em;">25,559 ± 4 km<br><br/>4.007 Earths<sup class="reference" id="cite_ref-Seidelmann2007_6-0"><a rel="nofollow" href="#cite_note-Seidelmann2007-6"><span>[</span>7<span>]</span></a></sup><sup class="reference" id="ref_Cnone"><a rel="nofollow" href="#endnote_Cnone">[c]</a></sup></td><br/></tr><br/><tr><br/><th style="line-height: 1.1em;"><a rel="nofollow" href="/wiki/Geographical_pole" title="Geographical pole">Polar</a> radius</th><br/><td style="line-height: 1.2em;">24,973 ± 20 km<br><br/>3.929 Earths<sup class="reference" id="cite_ref-Seidelmann2007_6-1"><a rel="nofollow" href="#cite_note-Seidelmann2007-6"><span>[</span>7<span>]</span></a></sup><sup class="reference" id="ref_Cnone"><a rel="nofollow" href="#endnote_Cnone">[c]</a></sup></td><br/></tr><br/><tr><br/><th style="line-height: 1.1em;"><a rel="nofollow" href="/wiki/Flattening" title="Flattening">Flattening</a></th><br/><td style="line-height: 1.2em;">0.022 9 ± 0.000 8<sup class="reference" id="ref_Bnone"><a rel="nofollow" href="#endnote_Bnone">[b]</a></sup></td><br/></tr><br/><tr><br/><th style="line-height: 1.1em;"><a rel="nofollow" href="/wiki/Spheroid#Surface_area" title="Spheroid">Surface area</a></th><br/><td style="line-height: 1.2em;">8.115 6 × 10<sup>9</sup> km²<sup class="reference" id="cite_ref-nasafact_7-0"><a rel="nofollow" href="#cite_note-nasafact-7"><span>[</span>8<span>]</span></a></sup><sup class="reference" id="ref_Cnone"><a rel="nofollow" href="#endnote_Cnone">[c]</a></sup><br><br/>15.91 Earths</td><br/></tr><br/><tr><br/><th style="line-height: 1.1em;"><a rel="nofollow" href="/wiki/Volume" title="Volume">Volume</a></th><br/><td style="line-height: 1.2em;">6.833 × 10<sup>13</sup> km³<sup class="reference" id="cite_ref-fact_4-2"><a rel="nofollow" href="#cite_note-fact-4"><span>[</span>5<span>]</span></a></sup><sup class="reference" id="ref_Cnone"><a rel="nofollow" href="#endnote_Cnone">[c]</a></sup><br><br/>63.086 Earths</td><br/></tr><br/><tr><br/><th style="line-height: 1.1em;"><a rel="nofollow" href="/wiki/Mass" title="Mass">Mass</a></th><br/><td style="line-height: 1.2em;"><span style="white-space: nowrap;">(8.6810 ± 0.0013) × 10<sup>25</sup> <a rel="nofollow" href="/wiki/Kilogram" title="Kilogram">kg</a></span><br><br/>14.536 Earths<sup class="reference" id="cite_ref-Jacobson1992_8-0"><a rel="nofollow" href="#cite_note-Jacobson1992-8"><span>[</span>9<span>]</span></a></sup><br><br/><a rel="nofollow" href="/wiki/Standard_gravitational_parameter" title="Standard gravitational parameter">GM</a>=5 793 939 ± 13 km³/s²</td><br/></tr><br/><tr><br/><th style="line-height: 1.1em;">Mean <a rel="nofollow" href="/wiki/Density" title="Density">density</a></th><br/><td style="line-height: 1.2em;">1.27 g/cm³<sup class="reference" id="cite_ref-fact_4-3"><a rel="nofollow" href="#cite_note-fact-4"><span>[</span>5<span>]</span></a></sup><sup class="reference" id="ref_Cnone"><a rel="nofollow" href="#endnote_Cnone">[c]</a></sup></td><br/></tr><br/><tr><br/><th style="line-height: 1.1em;"><a rel="nofollow" href="/wiki/Surface_gravity" title="Surface gravity">Equatorial surface gravity</a></th><br/><td style="line-height: 1.2em; vertical-align: middle;">8.69 <a rel="nofollow" href="/wiki/Acceleration" title="Acceleration">m/s²</a><sup class="reference" id="cite_ref-fact_4-4"><a rel="nofollow" href="#cite_note-fact-4"><span>[</span>5<span>]</span></a></sup><sup class="reference" id="ref_Cnone"><a rel="nofollow" href="#endnote_Cnone">[c]</a></sup><br><br/>0.886 <a rel="nofollow" href="/wiki/G-force" title="G-force">g</a></td><br/></tr><br/><tr><br/><th style="line-height: 1.1em;"><a rel="nofollow" href="/wiki/Escape_velocity" title="Escape velocity">Escape velocity</a></th><br/><td style="line-height: 1.2em; vertical-align: middle;">21.3 km/s<sup class="reference" id="cite_ref-fact_4-5"><a rel="nofollow" href="#cite_note-fact-4"><span>[</span>5<span>]</span></a></sup><sup class="reference" id="ref_Cnone"><a rel="nofollow" href="#endnote_Cnone">[c]</a></sup></td><br/></tr><br/><tr><br/><th style="line-height: 1.1em;"><a rel="nofollow" href="/wiki/Rotation_period" title="Rotation period">Sidereal rotation<br><br/>period</a></th><br/><td style="line-height: 1.2em; vertical-align: middle;"><a rel="nofollow" href="/wiki/Retrograde_motion" title="Retrograde motion">–</a>0.718 33 day<br><br/><span style="white-space: nowrap;">17 <a rel="nofollow" href="/wiki/Hour" title="Hour">h</a> 14 <a rel="nofollow" href="/wiki/Minute" title="Minute">min</a> 24 <a rel="nofollow" href="/wiki/Second" title="Second">s</a></span><sup class="reference" id="cite_ref-Seidelmann2007_6-2"><a rel="nofollow" href="#cite_note-Seidelmann2007-6"><span>[</span>7<span>]</span></a></sup></td><br/></tr><br/><tr><br/><th style="line-height: 1.1em;">Equatorial rotation velocity</th><br/><td style="line-height: 1.2em; vertical-align: middle;">2.59 km/s<br><br/>9,320 km/h</td><br/></tr><br/><tr><br/><th style="line-height: 1.1em;"><a rel="nofollow" href="/wiki/Axial_tilt" title="Axial tilt">Axial tilt</a></th><br/><td style="line-height: 1.2em;">97.77°<sup class="reference" id="cite_ref-Seidelmann2007_6-3"><a rel="nofollow" href="#cite_note-Seidelmann2007-6"><span>[</span>7<span>]</span></a></sup></td><br/></tr><br/><tr><br/><th style="line-height: 1.1em;">North pole <span style="white-space: nowrap;"><a rel="nofollow" href="/wiki/Right_ascension" title="Right ascension">right ascension</a></span></th><br/><td style="line-height: 1.2em; vertical-align: middle;"><span style="white-space: nowrap;">17 h 9 min 15 s</span><br><br/>257.311°<sup class="reference" id="cite_ref-Seidelmann2007_6-4"><a rel="nofollow" href="#cite_note-Seidelmann2007-6"><span>[</span>7<span>]</span></a></sup></td><br/></tr><br/><tr><br/><th style="line-height: 1.1em;">North pole <a rel="nofollow" href="/wiki/Declination" title="Declination">declination</a></th><br/><td style="line-height: 1.2em; vertical-align: middle;">–15.175°<sup class="reference" id="cite_ref-Seidelmann2007_6-5"><a rel="nofollow" href="#cite_note-Seidelmann2007-6"><span>[</span>7<span>]</span></a></sup></td><br/></tr><br/><tr><br/><th style="line-height: 1.1em;"><a rel="nofollow" href="/wiki/Albedo" title="Albedo">Albedo</a></th><br/><td style="line-height: 1.2em;">0.<nobr><a rel="nofollow" class="PSAdLink" href="#" id="PSLINK_1_0_1">300</a></nobr> (<a rel="nofollow" href="/wiki/Bond_albedo" title="Bond albedo">bond</a>)<br><br/>0.51 (<a rel="nofollow" href="/wiki/Geometric_albedo" title="Geometric albedo">geom.</a>)<sup class="reference" id="cite_ref-fact_4-6"><a rel="nofollow" href="#cite_note-fact-4"><span>[</span>5<span>]</span></a></sup></td><br/></tr><br/><tr><br/><th style="line-height: 1.1em;">Surface <a rel="nofollow" href="/wiki/Temperature" title="Temperature">temp.</a><br><br/><span style="white-space: nowrap;"> </span>1 <a rel="nofollow" href="/wiki/Bar_%28unit%29" title="Bar (unit)">bar</a> level<sup class="reference" id="cite_ref-Podolak1995_10-0"><a rel="nofollow" href="#cite_note-Podolak1995-10"><span>[</span>11<span>]</span></a></sup><br><br/><span style="white-space: nowrap;"> </span>0.1 bar<br><br/>(<a rel="nofollow" href="/wiki/Tropopause" title="Tropopause">tropopause</a>)<sup class="reference" id="cite_ref-Lunine1993_11-0"><a rel="nofollow" href="#cite_note-Lunine1993-11"><span>[</span>12<span>]</span></a></sup></th><br/><td><br/><table border="0" cellpadding="0" style="background: rgb(249, 249, 249) none repeat scroll 0% 0%; width: 100%; -moz-background-clip: border; -moz-background-origin: padding; -moz-background-inline-policy: continuous;" cellspacing="0"><br/><tbody><tr><br/><th style="width: 31%; padding-right: 0.25em; line-height: 1.1em; text-align: left;">min</th><br/><th style="width: 38%; padding-right: 0.25em; line-height: 1.1em; text-align: left;">mean</th><br/><th style="width: 31%; padding-right: 0.25em; line-height: 1.1em; text-align: left;">max</th><br/></tr><br/><tr><br/><td style="line-height: 1.1em;"></td><br/><td style="line-height: 1.1em;">76 <a rel="nofollow" href="/wiki/Kelvin" title="Kelvin">K</a></td><br/><td style="line-height: 1.1em;"></td><br/></tr><br/><tr><br/><td style="line-height: 1.1em;">49 K</td><br/><td style="line-height: 1.1em;">53 K</td><br/><td style="line-height: 1.1em;">57 K</td><br/></tr><br/></tbody></table><br/></td><br/></tr><br/><tr><br/><th style="line-height: 1.1em;"><a rel="nofollow" href="/wiki/Apparent_magnitude" title="Apparent magnitude">Apparent magnitude</a></th><br/><td style="line-height: 1.2em; vertical-align: middle;">5.9<sup class="reference" id="cite_ref-ephemeris_9-0"><a rel="nofollow" href="#cite_note-ephemeris-9"><span>[</span>10<span>]</span></a></sup> to 5.32<sup class="reference" id="cite_ref-fact_4-7"><a rel="nofollow" href="#cite_note-fact-4"><span>[</span>5<span>]</span></a></sup></td><br/></tr><br/><tr><br/><th style="line-height: 1.1em;"><a rel="nofollow" href="/wiki/Angular_diameter" title="Angular diameter">Angular diameter</a></th><br/><td style="line-height: 1.2em; vertical-align: middle;">3.3"–4.1"<sup class="reference" id="cite_ref-fact_4-8"><a rel="nofollow" href="#cite_note-fact-4"><span>[</span>5<span>]</span></a></sup></td><br/></tr><br/><tr><br/><th style="text-align: center; padding-top: 0.75em;" colspan="2"><br/><div style="background: rgb(192, 255, 255) none repeat scroll 0% 0%; -moz-background-clip: border; -moz-background-origin: padding; -moz-background-inline-policy: continuous;">Atmosphere<sup class="reference" id="cite_ref-Lunine1993_11-1"><a rel="nofollow" href="#cite_note-Lunine1993-11"><span>[</span>12<span>]</span></a></sup><sup class="reference" id="cite_ref-Lindal1987_12-0"><a rel="nofollow" href="#cite_note-Lindal1987-12"><span>[</span>13<span>]</span></a></sup><sup class="reference" id="cite_ref-Conrath1987_13-0"><a rel="nofollow" href="#cite_note-Conrath1987-13"><span>[</span>14<span>]</span></a></sup><sup class="reference" id="ref_Dnone"><a rel="nofollow" href="#endnote_Dnone">[d]</a></sup></div><br/></th><br/></tr><br/><tr><br/><th style="line-height: 1.1em;"><a rel="nofollow" href="/wiki/Scale_height" title="Scale height">Scale height</a></th><br/><td style="line-height: 1.2em;">27.7 km<sup class="reference" id="cite_ref-fact_4-9"><a rel="nofollow" href="#cite_note-fact-4"><span>[</span>5<span>]</span></a></sup></td><br/></tr><br/><tr><br/><th style="line-height: 1.1em;">Composition</th><br/><td style="line-height: 1.2em;"><i>(Below 1.3 bar)</i><br/><table><br/><tbody><tr><br/><td>83 ± 3%</td><br/><td><a rel="nofollow" href="/wiki/Hydrogen" title="Hydrogen">Hydrogen</a> (H<sub>2</sub>)</td><br/></tr><br/><tr><br/><td>15 ± 3%</td><br/><td><a rel="nofollow" href="/wiki/Helium" title="Helium">Helium</a></td><br/></tr><br/><tr><br/><td>2.3%</td><br/><td><a rel="nofollow" href="/wiki/Methane" title="Methane">Methane</a></td><br/></tr><br/><tr><br/><td>0.009%<br><br/>(0.007–0.015%)</td><br/><td><a rel="nofollow" href="/wiki/Hydrogen_deuteride" title="Hydrogen deuteride">Hydrogen deuteride</a> (HD)<sup class="reference" id="cite_ref-Feuchtgruber1999_14-0"><a rel="nofollow" href="#cite_note-Feuchtgruber1999-14"><span>[</span>15<span>]</span></a></sup></td><br/></tr><br/><tr><br/><td><b><nobr><a rel="nofollow" class="PSAdLink" href="#" id="PSLINK_2_0_0">Ices</a></nobr></b>:</td><br/><td></td><br/></tr><br/><tr><br/><td></td><br/><td><a rel="nofollow" href="/wiki/Ammonia" title="Ammonia">Ammonia</a></td><br/></tr><br/><tr><br/><td></td><br/><td><a rel="nofollow" class="mw-redirect" href="/wiki/Water_%28molecule%29" title="Water (molecule)">water</a></td><br/></tr><br/><tr><br/><td></td><br/><td><a rel="nofollow" href="/wiki/Ammonium_hydrosulfide" title="Ammonium hydrosulfide">ammonium hydrosulfide</a> (NH<sub>4</sub>SH)</td><br/></tr><br/><tr><br/><td></td><br/><td><a rel="nofollow" href="/wiki/Methane" title="Methane">methane</a> (CH<sub>4</sub>)</td><br/></tr><br/></tbody></table><br/></td><br/></tr><br/><tr><br/><td colspan="2"><br/><div class="references-small"></div><br/></td><br/></tr><br/></tbody></table><br/><p><b>Uranus</b> is the seventh <a rel="nofollow" href="/wiki/Planet" title="Planet">planet</a> from the <a rel="nofollow" href="/wiki/Sun" title="Sun">Sun</a>, and the third-largest and fourth most massive planet in the <a rel="nofollow" href="/wiki/Solar_System" title="Solar System">Solar System</a>. It is named after the ancient Greek deity of the sky <a rel="nofollow" href="/wiki/Uranus_%28mythology%29" title="Uranus (mythology)">Uranus</a> (<a rel="nofollow" href="/wiki/Ancient_Greek" title="Ancient Greek">Ancient Greek</a>: <span xml:lang="grc" lang="grc"><a rel="nofollow" class="extiw" href="http://en.wiktionary.org/wiki/%CE%BF%E1%BD%90%CF%81%CE%B1%CE%BD%CF%8C%CF%82#Ancient_Greek" title="wikt:οὐρανός">Οὐρανός</a></span>) the father of <a rel="nofollow" href="/wiki/Cronus" title="Cronus">Cronus</a> (<a rel="nofollow" href="/wiki/Saturn_%28mythology%29" title="Saturn (mythology)">Saturn</a>) and grandfather of <a rel="nofollow" href="/wiki/Zeus" title="Zeus">Zeus</a> (<a rel="nofollow" href="/wiki/Jupiter_%28mythology%29" title="Jupiter (mythology)">Jupiter</a>). Though it is visible to the naked eye like the five <a rel="nofollow" href="/wiki/Classical_planet" title="Classical planet">classical planets</a>, it was never recognized as a planet by ancient observers because of its dimness and slow orbit.<sup class="reference" id="cite_ref-15"><a rel="nofollow" href="#cite_note-15"><span>[</span>16<span>]</span></a></sup> Sir <a rel="nofollow" href="/wiki/William_Herschel" title="William Herschel">William Herschel</a> announced its discovery on March 13, 1781, expanding the known boundaries of the <nobr><a rel="nofollow" class="PSAdLink" href="#" id="PSLINK_3_0_2">Solar</a></nobr> System for the first time in modern history. Uranus was also the first planet discovered with a <a rel="nofollow" href="/wiki/Telescope" title="Telescope">telescope</a>.</p>
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17 Nov 08
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0.886 g
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05 Nov 07
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Uranus
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13 Mar 07
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