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10 More Moons of Jupiter Confirmed, Including Tiny 'Oddball'

Planet has 79 moons total
By Newser Editors and Wire Services
Posted Jul 17, 2018 2:47 PM CDT
This April 3, 2017 image made available by NASA shows the planet Jupiter.   (GSFC) via AP, File)

(Newser) – Astronomers are still finding moons at Jupiter, 400 years after Galileo used his spyglass to spot the first ones. The latest discovery of a dozen small moons brings the total to 79, the most of any planet in our solar system, the AP reports. Scientists were looking for objects on the fringes of the solar system last year when they pointed their telescopes close to Jupiter's backyard, according to Scott Sheppard of the Carnegie Institute for Science in Washington. They saw a new group of objects moving around the giant gas planet but didn't know whether they were moons or asteroids passing near Jupiter. "There was no eureka moment," said Sheppard, who led the team of astronomers. "It took a year to figure out what these objects were." They all turned out to be moons of Jupiter. The confirmation of 10 was announced Tuesday. Two were confirmed earlier.

The moons had not been spotted before because they are tiny. They are about one to two miles across, said astronomer Gareth Williams of the International Astronomical Union's Minor Planet Center. And he thinks Jupiter might have even more moons just as small waiting to be found. "We just haven't observed them enough," said Williams, who helped confirm the moons' orbits. The team is calling one of the new moons an 'oddball' because of its unusual orbit. Sheppard's girlfriend came up with a name for it: Valetudo, the great-granddaughter of the Roman god Jupiter. Valetudo is in Jupiter's distant, outer swarm of moons that circles in the opposite direction of the planet's rotation. Yet it's orbiting in the same direction as the planet, against the swarm's traffic. "This moon is going down the highway the wrong way," Sheppard said. Telescopes in Chile, Hawaii and Arizona were used for the latest discovery and confirmation.

(Read more Jupiter stories.)

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