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20 new moons found around Saturn, snagging satellite record from Jupiter

8 Oct 2019, 08:50 UTC
20 new moons found around Saturn, snagging satellite record from Jupiter
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Saturn has overtaken Jupiter as the solar system’s satellite king.
Astronomers just discovered 20 previously unknown Saturn moons, boosting the ringed planet’s tally of known satellites to 82 — three more than Jupiter. And there’s more exciting news: You can help name these newfound objects.
All 20 moons are tiny, measuring about five kilometres (three miles) across. Seventeen of them have retrograde orbits, meaning they move around Saturn in the opposite direction to the planet’s rotation. These 17 all take more than three Earth years to complete one Saturn lap, and the most far-flung one is the most distant Saturn satellite known, discovery team members said.
One of the three newly discovered “prograde” moons has an orbital period of more than three Earth years, while the other two complete one lap every two years or so.
The 17 retrograde moons appear to belong to the “Norse group” of Saturn satellites, which share the same basic orbital parameters. The two innermost prograde objects align with the “Inuit group,” and the outermost prograde moon among the new finds may belong to the “Gallic group,” but that’s unclear at the moment, researchers said.
The discovery images for the newly found very distant prograde ...

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