Dim ring system composed of dark particulate matter with diameter less than 10 meters
Uranus ring is a dim ring system composed of dark particulate matter with a diameter of less than 10 metersSaturn RingAfter, onsolar systemThe second ring system found inside.Of the 13 clear rings known, the brightest is the ε ring.
UranusIt is the seventh planet in the solar system, discovered in 1781.But it was not until 1977 that people discovered its ring.NASA's Voyager 2 spacecraft sent back the first image of Uranus' ring in 1986.When taking picturesVoyager 2Located in the shadow of Uranus, the distance is 236000 km.Uranus has 13 dust rings. Astronomers on the ground can only observe the edges of these rings every 84 years.In 2003, the faint outer ring of Uranus appeared in Hubble's view, but it was not noticed by astronomers until 2005.
The Hubble images show that these rings are located above or below Uranus and look like long nails.Because most of the bright light of Uranus is blocked in the Hubble pictures, scientists cannot see the process of these rings passing through the surface of Uranus.The residual light shows a fan-shaped shape, accompanied by the edge between the inner and outer rings.A series of Keck images show how astronomers have seen the size and distance of Uranus's ring change since 2004.The new image shows that the appearance of Uranus' ring has changed greatly since the 1980s.This indicates that the planet has suffered a huge impact in the past 21 years.
General list of Uranus rings
Ring name
Radius (km)
Width (km)
Constant depth (km)
Thickness (m)
Inclination angle (°)
ζcc
26 840–34 890
8 000
zero point eight
?
?
ζc
32 000–37 850
3 500
zero point six
?
?
1986U2R
37 000–39 500
2 500
?
?
?
ζ
37 850–41 350
3 500
one
?
?
six
41 837
1.6–2.2
zero point four one
?
zero point zero six two
five
42 234
1.9–4.9
zero point nine one
?
zero point zero five four
four
42 570
2.4–4.4
zero point seven one
?
zero point zero three two
α
44 718
4.8–10.0
three point three nine
?
zero point zero one five
β
45 661
6.1–11.4
two point one four
?
zero point zero zero five
η
47 175
1.9–2.7
zero point four two
?
zero point zero zero one
ηc
47 176
forty
zero point eight five
?
zero point zero zero one
γ
47 627
3.6–4.7
three point three
150?
zero point zero zero two
δc
48 300
10–12
zero point three
?
zero point zero zero one
δ
48 300
4.1–6.1
two point two
?
zero point zero zero one
λ
50 023
1–2
zero point two
?
0?
ε
51 149
19.7–96.4
forty-seven
150?
zero
ν
66 100–69 900
3 800
zero point zero one two
?
?
μ
86 000–103 000
17 000
zero point one four
?
?
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Uranus ring
Japanese astronomers used theCelestial telescope, successfully took pictures of Uranus, Uranus ring and its satellites. This is a group of three photos taken in the near-infrared band with different filters, so the color of the photos is not like the color we see in the visible light band.Uranus in the picture is blue, and methaneInfrared bandThis is the color because Uranus's atmosphere is mainly composed of methane.
Uranus is a British astronomerWilliam HerschelDiscovered on March 13, 1781, he used his own telescope with a diameter of 16cm to see the planet.At first he thought it was a comet, but further observation showed that it was a new planet farther than Saturn.Uranus rotates around the sun in 84 years and 16.2 hours.It rotates in an elliptical orbit,trackThe average radius is about 2.8 billion kilometers (19.18 astronomical units).Uranus and othersSolar system planetsDifferent, it seems to lie on its side and rotate around its axis.
Since the discovery of Uranus, a total of 10 rings and 15 satellites have been found. Uranus rings are not likeSaturn RingThey are very thin and are really linear rings, so only by using special observation methods can we see Uranus rings.
Outer ring system
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In December 2005,Hubble Space TelescopeA pair of previously undiscovered rings, now called the outer ring system, was detected, increasing the number of known rings of Uranus to 13 circles.The outermost ring is called μ ring, which is twice as far away as the brighter η ring.Harper also discovered two new moons, of whichTianwei 26It also shares the orbit with the outermost μ ring, and the exploded surface material may be the raw material source of the ring.
In April 2006,Keck Observatory In the image of the new ring released, one ring of the outermost ring is blue and the other is red.The hypothesis that the color of the outer ring is blue is that it is derived fromTianwei 26It is composed of fine ice particles, so it can scatter enough blue light.Uranus's inner ring looks gray.
Origin of ring system
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Uranus rings are quite young, and the differences in the gaps and turbidity between the rings show that they were not formed at the same time as Uranus.The material in the ring may be debris formed by a high-speed impact or tidal force tearing up part of the satellite.
Introduction to observation
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Uranus ring
thinkWilliam Herschel The reason for observing the ring of Uranus in the 18th century first came from his observation record, which detailed the observation of Uranus on February 22, 1789, including the following paragraph: "I feel there is a ring".
Herschel drew a circle on a small picture, and noted "a little bit inclined to red"Keck telescopeIt proves that such description is true.Herschel's notes were written byroyal society Printed and published, but in nearly two centuries from 1797 to 1977, the Uranus Ring was rarely, or even never mentioned.It has to be seriously doubted what Herschel saw, and then hundreds of other astronomers did not see anything?To be fair, even if Herschel gave the correct relationship between Uranus' ring and its size, Uranus's movement near the sun may also change the ring and its color.
