Discovery | |||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Discovered by | William Herschel | ||||||||||||||||||
Discovery date | March 13, 1781 | ||||||||||||||||||
Designations | |||||||||||||||||||
Adjectives | Uranian | ||||||||||||||||||
Symbol | |||||||||||||||||||
Orbital characteristics[1][a] | |||||||||||||||||||
Epoch J2000 | |||||||||||||||||||
Aphelion | 3,004,419,704 km 20.083 305 26 AU | ||||||||||||||||||
Perihelion | 2,748,938,461 km 18.375 518 63 AU | ||||||||||||||||||
2,876,679,082 km 19.229 411 95 AU | |||||||||||||||||||
Eccentricity | 0.044 405 586 | ||||||||||||||||||
30,799.095 days 84.323 326 yr | |||||||||||||||||||
369.66 days[2] | |||||||||||||||||||
Average orbital speed | 6.81 km/s[2] | ||||||||||||||||||
142.955 717° | |||||||||||||||||||
Inclination | 0.772 556° 6.48° to Sun's equator | ||||||||||||||||||
73.989 821° | |||||||||||||||||||
96.541 318° | |||||||||||||||||||
Known satellites | 27 | ||||||||||||||||||
Physical characteristics | |||||||||||||||||||
Equatorial radius | 25,559 ± 4 km 4.007 Earths[3][c] | ||||||||||||||||||
Polar radius | 24,973 ± 20 km 3.929 Earths[3][c] | ||||||||||||||||||
Flattening | 0.022 9 ± 0.000 8[b] | ||||||||||||||||||
8.115 6×109 km²[4][c] 15.91 Earths | |||||||||||||||||||
Volume | 6.833×1013 km³[2][c] 63.086 Earths | ||||||||||||||||||
Mass | (8.6810 ± 0.0013)×1025 kg 14.536 Earths[5] GM=5 793 939 ± 13 km³/s² | ||||||||||||||||||
Mean density | 1.27 g/cm³[2][c] | ||||||||||||||||||
8.69 m/s²[2][c] 0.886 g | |||||||||||||||||||
21.3 km/s[2][c] | |||||||||||||||||||
−0.718 33 day 17 h 14 min 24 s[3] | |||||||||||||||||||
Equatorial rotation velocity | 2.59 km/s 9,320 km/h | ||||||||||||||||||
97.77°[3] | |||||||||||||||||||
North pole right ascension | 17 h 9 min 15 s 257.311°[3] | ||||||||||||||||||
North pole declination | −15.175°[3] | ||||||||||||||||||
Albedo | 0.300 (bond) 0.51 (geom.)[2] | ||||||||||||||||||
| |||||||||||||||||||
5.9[8] to 5.32[2] | |||||||||||||||||||
3.3"–4.1"[2] | |||||||||||||||||||
Atmosphere[7][9][10][d] | |||||||||||||||||||
27.7 km[2] | |||||||||||||||||||
Composition by volume | (Below 1.3 bar)
| ||||||||||||||||||
- ^ Yeomans, Donald K. (July 13, 2006). "HORIZONS System". NASA JPL. Retrieved 2007-08-08. — At the site, go to the "web interface" then select "Ephemeris Type: ELEMENTS", "Target Body: Uranus Barycenter" and "Center: Sun".
- ^ a b c d e f g h i j Williams, Dr. David R. (January 31, 2005). "Uranus Fact Sheet". NASA. Retrieved 2007-08-10.
- ^ a b c d e f Cite error: The named reference
Seidelmann2007
was invoked but never defined (see the help page). - ^ Munsell, Kirk (May 14, 2007). "NASA: Solar System Exploration: Planets: Uranus: Facts & Figures". NASA. Retrieved 2007-08-13.
- ^ Cite error: The named reference
Jacobson1992
was invoked but never defined (see the help page). - ^ Cite error: The named reference
Podolak1995
was invoked but never defined (see the help page). - ^ a b Cite error: The named reference
Lunine1993
was invoked but never defined (see the help page). - ^ Cite error: The named reference
ephemeris
was invoked but never defined (see the help page). - ^ Cite error: The named reference
Lindal1987
was invoked but never defined (see the help page). - ^ Cite error: The named reference
Conrath1987
was invoked but never defined (see the help page). - ^ Feuchtgruber, H. (1999). "Detection of HD in the atmospheres of Uranus and Neptune: a new determination of the D/H ratio". Astronomy and Astrophysics. 341: L17–L21. Bibcode:1999A&A...341L..17F.
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