The Tenth Ring of Uranus
The frames composing this picture were obtained Jan. 23, 1986, from a distance of 1.12 million kilometers (690,000 miles). The tenth ring is about midway between the bright, outermost epsilon ring and the next ring down, called delta. The tenth ring, the first such feature discovered by Voyager, orbits Uranus at a radius of about 50,000 km (30,000 mi). This places the ring close to the orbit of the recently discovered ‘shepherd’ satellite 1986U7. All nine of the previously known rings of Uranus are visible: epsilon, delta, gamma, eta, beta, alpha, 4, 5 and 6 (from top).
This image has been processed to enhance narrow features; the resolution is roughly 10 km (6 mi). Both a bright, narrow inner component and a fainter, extended outer component of the eta ring are distinct in this view. The epsilon ring — which at this location achieves its maximum width of 100 km (60 mi) — and the broad component of the eta ring are the only features resolved here. The Voyager project is managed for NASA by the Jet Propulsion Laboratory.
Credit: Jet Propulsion Laboratory. View Uranus slideshow.
Hubble Space Telescope has peered deep into Uranus’ atmosphere to see clear and hazy layers created by a mixture of gases. Using infrared filters, Hubble captured detailed features of three layers of Uranus’ atmosphere.
Hubble’s images are different from the ones taken by the Voyager 2 spacecraft, which flew by Uranus 10 years ago. Those images – not taken in infrared light – showed a greenish-blue disk with very little detail.
The infrared image allows astronomers to probe the structure of Uranus’ atmosphere, which consists of mostly hydrogen with traces of methane. The red around the planet’s edge represents a very thin haze at a high altitude. The haze is so thin that it can only be seen by looking at the edges of the disk, and is similar to looking at the edge of a soap bubble. The yellow near the bottom of Uranus is another hazy layer. The deepest layer, the blue near the top of Uranus, shows a clearer atmosphere.
Image processing has been used to brighten the rings around Uranus so that astronomers can study their structure. In reality, the rings are as dark as black lava or charcoal.
This false color picture was assembled from several exposures taken July 3, 1995 by the Wide Field Planetary Camera-2.
Credit: Hubble Telescope/JPL
The Wide Field/Planetary Camera 2 was developed by the Jet Propulsion Laboratory and managed by the Goddard Space Flight Center for NASA’s Office of Space Science.
This false-color view of the rings of Uranus was made from images taken by Voyager 2 on Jan. 21, 1986, from a distance of 4.17 million kilometers (2.59 million miles). All nine known rings are visible here; the somewhat fainter, pastel lines seen between them are contributed by the computer enhancement. Six 15-second narrow-angle images were used to extract color information from the extremely dark and faint rings. Two images each in the green, clear and violet filters were added together and averaged to find the proper color differences between the rings. The final image was made from these three color averages and represents an enhanced, false-color view. The image shows that the brightest, or epsilon, ring at top is neutral in color, with the fainter eight other rings showing color differences between them.
Moving down, toward Uranus, we see the delta, gamma and eta rings in shades of blue and green; the beta and alpha rings in somewhat lighter tones; and then a final set of three, known simply as the 4, 5 and 6 rings, in faint off-white tones. Scientists will use this color information to try to understand the nature and origin of the ring material. The resolution of this image is approximately 40 km (25 mi). The Voyager project is managed for NASA by the Jet Propulsion Laboratory.
These images and other images and data received from the Hubble Space Telescope are posted on the World Wide Web on the Space Telescope Science Institute home page at URL http://oposite.stsci.edu/.
Source: Jet Propulsion Laboratory
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