‘Oddball’ among 12 new Jupiter moons

Astronomers have discovered 12 additional moons orbiting Jupiter, bringing the total to 79, the most of any planet in the solar system, a new study found.

The moons were discovered while astronomers were searching for objects at the edge of the solar system, according to Scott Sheppard, a scientist at the Carnegie Institution for Science, who co-authored the study.

“Jupiter just happened to be in the sky near the search fields where we were looking for extremely distant solar system objects, so we were serendipitously able to look for new moons around Jupiter while at the same time looking for planets at the fringes of our solar system,” Sheppard said.

One of the objects they were looking for is the mysterious “Planet X” or “Planet Nine,” which remains undiscovered.

The discovery of the new moons was reported Tuesday in the Minor Planet Electronic Circular, a publication of the International Astronomical Union.

Researchers say the new Jupiter moons weren’t seen before because they are tiny – the biggest ones are only about 2 miles across.

One of the newly discovered moons is an “oddball,” Sheppard said. “It has an orbit like no other known Jovian moon,” he explained. It orbits in an opposite direction from the other moons near it, meaning head-on collisions are much more likely to occur.

“This is an unstable situation,” Sheppard said. “Head-on collisions would quickly break apart and grind the objects down to dust.”