ᱵᱚᱸᱜᱟ ᱮᱸᱜᱮᱞ
ᱪᱤᱱᱦᱟᱹ: ᱾
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| Discovery | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Discovered by | William Herschel | ||||||||||||
| Discovery date | ᱦᱩᱲᱟᱹᱜ : ᱚᱢᱟᱱᱚᱛ ᱚᱠᱛᱚ ᱾ | ||||||||||||
| Designations | |||||||||||||
| Pronunciation | /ˈjʊərənəs/ or /jʊˈreɪnəs/ | ||||||||||||
Named after | the Latin form Ūranus of the Greek god Οὐρανός Ouranos | ||||||||||||
| Adjectives | Uranian /jʊˈreɪniən/ | ||||||||||||
| Orbital characteristics | |||||||||||||
| Epoch J2000 | |||||||||||||
| Aphelion | 20.11 AU (3008 Gm) | ||||||||||||
| Perihelion | 18.33 AU (2742 Gm) | ||||||||||||
Semi-major axis | 19.2184 AU (2,875.04 Gm) | ||||||||||||
| Eccentricity | 0.046381 | ||||||||||||
Orbital period |
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Synodic period | 369.66 days | ||||||||||||
Average orbital speed | 6.80 km/s | ||||||||||||
Mean anomaly | 142.238600° | ||||||||||||
| Inclination | 0.773° to ecliptic 6.48° to Sun's equator 1.02° to invariable plane | ||||||||||||
Longitude of ascending node | 74.006° | ||||||||||||
Argument of perihelion | 96.998857° | ||||||||||||
| Known satellites | 27 | ||||||||||||
| Physical characteristics | |||||||||||||
Mean radius | 25,362±7 km | ||||||||||||
Equatorial radius | 25,559±4 km 4.007 Earths | ||||||||||||
Polar radius | 24,973±20 km 3.929 Earths | ||||||||||||
| Flattening | 0.0229±0.0008 | ||||||||||||
| Circumference | 159,354.1 km | ||||||||||||
Surface area | 8.1156×109 km2 15.91 Earths | ||||||||||||
| Volume | 6.833×1013 km3 63.086 Earths | ||||||||||||
| Mass | (8.6810±0.0013)×1025 kg 14.536 Earths GM=5,793,939±13 km3/s2 | ||||||||||||
Mean density | 1.27 g/cm3 | ||||||||||||
Surface gravity | 8.69 m/s2 0.886 g | ||||||||||||
Moment of inertia factor | 0.23 (estimate) | ||||||||||||
Escape velocity | 21.3 km/s | ||||||||||||
Sidereal rotation period | −0.71833 d (retrograde) 17 h 14 min 24 s | ||||||||||||
Equatorial rotation velocity | 2.59 km/s 9,320 km/h | ||||||||||||
Axial tilt | 97.77° (to orbit) | ||||||||||||
North pole right ascension | ᱪᱷᱟᱸᱪ:RA 257.311° | ||||||||||||
North pole declination | −15.175° | ||||||||||||
| Albedo | 0.300 (Bond) 0.488 (geom.) | ||||||||||||
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Apparent magnitude | 5.38 to 6.03 | ||||||||||||
Angular diameter | 3.3″ to 4.1″ | ||||||||||||
| Atmosphere | |||||||||||||
Scale height | 27.7 km | ||||||||||||
| Composition by volume | (Below 1.3 bar) Gases:
Ices:
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ᱵᱟᱷᱨᱤ ᱰᱷᱟᱸᱪᱟ
ᱥᱟᱹᱠᱷᱭᱟᱹᱛ
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