Uranus moons:

1. Cordelia
2. Ophelia
3. Bianca
4. Cressida
5. Desdemona
6. Juliet
7. Portia
8. Rosalind
9. Mab
10. Belinda
11. Perdita
12. Puck
13. Cupid
14. Miranda
15. Francisco
16. Ariel
17. Umbriel
18. Titania
19. Oberon
20. Caliban
21. Stephano
22. Trinculo
23. Sycorax
24. Margaret
25. Prospero
26. Setebos
27. Ferdinand 

 Uranus: Rings


 Ring Name: Zeta (1986 U2R)
Distance*: 39,600 km
Width: 3,500 (plus 5,000 km extension inwards) km
Thickness: 0.1 km
Albedo: 0.03

Ring Name: 6
Distance*: 41,840 km
Width: 1 km - 3 km
Thickness: 0.1 km
Albedo: 0.03

Ring Name: 5
Distance*: 42,230 km
Width: 2 km - 3 km
Thickness: 0.1 km
Mass: 0.1 kg
Albedo: 0.03

Ring Name: 4
Distance*: 42,580 km
Width: 2 km - 3 km
Thickness: .1 km
Mass: .1 kg
Albedo: 0.03

Ring Name: Alpha
Distance*: 44,720 km
Width: 7 km - 12 km
Thickness: 0.1 km
Albedo: 0.03

Ring Name: Beta
Distance*: 45,670 km
Width: 7 km - 12 km
Thickness: 0.1 km
Albedo: 0.03

Ring Name: Eta
Distance*: 47,190 km
Width: 0 km - 2 km
Thickness: 0.1 km
Albedo: 0.03

Ring Name: Gamma
Distance*: 47,630 km
Width: 1 km - 4 km
Thickness: 0.1 km
Albedo: 0.03

Ring Name: Delta
Distance*: 48,290 km
Width: 3 km - 9 km
Thickness: 0.1 km
Albedo: 0.03

Ring Name: Lambda (1986 U1R)
Distance*: 50,024 km
Width: 2 km - 3 km
Thickness: 0.1 km
Albedo: 0.03

Ring Name: Epsilon
Distance*: 51,140 km
Width: 20 km - 100 km
Thickness: < 15 km
Albedo: 0.03

Ring Name: Nu (R/2003 U 2)
Distance*: 67,300 km
Width: 3,800 km

Ring Name: Mu (R/2003 U 1)
Distance*: 97,700 km
Width: 17,000 km

* The distance is measured from the planet center to the start of the ring.  
  

When two teams of scientists set up to watch Uranus pass in front of star SAO 158687 in 1977, they expected a rare chance to observe a distant planet. Instead, they made a major disovery: Uranus, like Saturn, is encircled with a band of rings.
As the observers in the Kuiper Airborne Observatory and the Perth Observatory in Australia watched, the star appeared to blink out briefly several times. The blinking was caused by the rings blocking the starlight. The Australian team was so surprised they missed three rings as they tried to figure out why the starlight signal kept disappearing.
The Kuiper team had a better vantage point and were first to publish the surprising news that Uranus was encircled by five narrow rings, which they named Alpha, Beta, Gamma, Delta and Epsilon in order of increasing distance from the planet. The Perth team identified six distinct dips in the starlight, which they named rings 1 through 6. More rings were discovered in 1986.
Observing distant planets is difficult, especially with complications due to daylight arriving before the planet completed its transit in front of the star. But, after careful analysis and a closer view courtesy of the Voyager 2 spacecraft in 1986, scientists have now identified 11 known rings around Uranus. In order of increasing distance from the planet, they are 1986U2R, 6, 5, 4, Alpha, Beta, Eta, Gamma, Delta, Lambda and Epsilon. Some of the larger rings are surrounded by belts of fine dust.
Reference: USGS Astrogeology: Gazetteer of Planetary Nomenclature - Ring Nomenclature
  
  

Uranus: Facts & Figures  
  
  
Discovered By
  William Herschel
 
  
Date of Discovery
  1781
 
  
Average Distance from the Sun
  Metric: 2,870,972,200 km
English: 1,783,939,400 miles
Scientific Notation: 2.8709722 x 109 km (19.191 A.U.) 
By Comparison: 19.191 x Earth
 
  
Perihelion (closest)
  Metric: 2,735,560,000 km
English: 1,699,800,000 miles
Scientific Notation: 2.73556 x 109 km (18.286 A.U.) 
By Comparison: 18.60 x Earth
 
  
Aphelion (farthest)
  Metric: 3,006,390,000 km
English: 1,868,080,000 miles
Scientific Notation: 3.00639 x 109 km (20.096 A.U.) 
By Comparison: 19.76 x Earth
 
  
Equatorial Radius
  Metric: 25,559 km
English: 15,882 miles
Scientific Notation: 2.5559 x 104 km
By Comparison: 4.007 x Earth
 
  
Equatorial Circumference
  Metric: 160,592 km
English: 99,787 miles
Scientific Notation: 1.60592 x 105 km
 
  
Volume
  Metric: 59,142,000,000,000 km3
Scientific Notation: 5.9142 x 1013 km3
By Comparison: 63.1 x Earth
 
  
Mass
  Metric: 86,849,000,000,000,000,000,000,000 kg
Scientific Notation: 8.6849 x 1025 kg
By Comparison: 14.371 x Earth's
 
  
Density
  Metric: 1.30 g/cm3
By Comparison: 0.236 x Earth
 
  
Surface Area
  Metric: 8,115,600,000 km2
English: 3,133,400,000 square miles
Scientific Notation: 8.1156 x 109 km2
By Comparison: 15.91 x Earth
 
  
Equatorial Surface Gravity
  Metric: 8.43 m/s2
English: 27.7 ft/s2
By Comparison: If you weigh 100 pounds on Earth, you would weigh 86 pounds on Uranus.
 
  
Escape Velocity
  Metric: 76,640 km/h
English: 47,620 mph
Scientific Notation: 21,290 m/s
By Comparison: 1.904 x Earth
 
  
Sidereal Rotation Period (Length of Day)
  -0.7196 Earth days (retrograde)
-17.24 hours (retrograde)
By Comparison: 0.722 x Earth
 
  
Sidereal Orbit Period (Length of Year)
  84.02 Earth years 
30,687.2 Earth days 
 
  
Mean Orbit Velocity
  Metric: 24,607 km/h
English: 15,290 mph
Scientific Notation: 6,835.2 m/s
By Comparison: 0.229 x Earth
 
  
Orbital Eccentricity
  .047168
By Comparison: 2.823 x Earth
 
  
Orbital Inclination to Ecliptic
  0.770 degrees
 
  
Equatorial Inclination to Orbit
  97.86 degrees
By Comparison: 4.173 x Earth
 
  
Orbital Circumference
  Metric: 17,620,000,000 km
Scientific Notation: 1.762 x 1010 km
By Comparison: 19.06 x Earth
 
  
Effective Temperature
  Metric: -216 °C
English: -357 °F
Scientific Notation: 57 K
 
  
Atmospheric Constituents
  Hydrogen, Helium, Methane
Scientific Notation: H2, He, CH4
By Comparison: Earth's atmosphere consists mostly of N2 and O2.
 
  
 


 
   

 

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