Uranus, Rings and Satellites. Hubble Space Telescope
Astronomers have discovered two of the smallest moons yet found around Uranus. The new moons, uncovered by NASA’s Hubble Space Telescope, are about 8 to 10 miles across (12 to 16 km) — about the size of San Francisco.
The two moons are so faint they eluded detection by the Voyager 2 spacecraft, which discovered 10 small satellites when it flew by the gas giant planet in 1986. The newly detected moons are orbiting even closer to the planet than the five major Uranian satellites, which are several hundred miles wide. The two new satellites are the first inner moons of Uranus discovered from an Earth-based telescope in more than 50 years. The International Astronomical Union (IAU) will announce the finding today. The Hubble telescope observations also helped astronomers confirm the discovery of another tiny moon that had originally been spotted in Voyager pictures.
"It’s a testament to how much our Earth-based instruments have improved in 20 plus years that we can now see such faint objects 1.7 billion miles (2.8 billion km) away," says Mark Showalter, a senior research associate at Stanford University in Stanford, Calif., who works at the NASA Ames Research Center, in Moffett Field, Calif. Showalter and Jack Lissauer, a research scientist at the NASA Ames Research Center, used Hubble’s Advanced Camera for Surveys (ACS) to make the discovery. The images were taken Aug. 25, 2003.
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